Every page starting with D
202 pages, in alphabetical order, each with the description it carries. A page filed under its own name rather than a prefix: a suburb page sorts by the suburb, and a title beginning with NZ sorts by the word after it.
Nothing on this letter matches that. Try the full A to Z.
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Housing in Daelyn
What housing costs in Daelyn, Nelson City: median weekly rent $600, the ownership and renting split, and household income, from the 2023 Census.
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Daily Calorie Deficit Calculator NZ
Work out the daily calorie deficit and daily calorie target to lose weight at your chosen rate, based on your maintenance calories (TDEE).
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Daily Light Integral (DLI) Calculator
Convert PPFD and photoperiod hours to Daily Light Integral in mol/m2/day, for plants indoors, in a greenhouse or under grow lights.
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Housing in Dairy Flat North
What housing costs in Dairy Flat North, Auckland: median weekly rent $720, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Dairy Flat South
What housing costs in Dairy Flat South, Auckland: median weekly rent $732, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Dairy Flat West
What housing costs in Dairy Flat West, Auckland: median weekly rent $560, the ownership and renting split, and household income, from the 2023 Census.
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Dairy Grazing Rate Calculator NZ
Work out what grazing young stock or wintering cows costs, from a rate per head per week, and convert it into cost per kilogram of liveweight gain and per kgMS.
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Dairy Payout Income Calculator NZ
Work out milk income from your kgMS at the current Fonterra forecast, and see what the same production is worth at both ends of the range the forecast was published with.
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Housing in Dallington
What housing costs in Dallington, Christchurch City: median weekly rent $400, the ownership and renting split, and household income, from the 2023 Census.
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Damping Ratio Calculator
Free damping ratio calculator. Work out the damping ratio (zeta) from mass, damping coefficient and spring stiffness, or from natural and damped frequency.
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Housing in Dannemora North-Shamrock Park
What housing costs in Dannemora North-Shamrock Park, Auckland: median weekly rent $780, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Dannemora South
What housing costs in Dannemora South, Auckland: median weekly rent $720, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Dannevirke East
What housing costs in Dannevirke East, Tararua District: median weekly rent $280, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Dannevirke West
What housing costs in Dannevirke West, Tararua District: median weekly rent $300, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Danseys Pass
What housing costs in Danseys Pass, Waitaki District: median weekly rent $200, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Darfield
What housing costs in Darfield, Selwyn District: median weekly rent $420, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Dargaville
What housing costs in Dargaville, Kaipara District: median weekly rent $332, the ownership and renting split, and household income, from the 2023 Census.
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Data Storage Converter
Convert data storage between bits, bytes, KB, MB, GB, TB, PB in both SI (decimal) and binary (IEC) standards. Shows all units simultaneously.
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Data Transfer Rate Converter
Convert data transfer rates between bps, Kbps, Mbps, Gbps, KB/s, MB/s, and GB/s. SI and IEC binary prefixes supported. Enter any unit and see all others instantly.
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Date Calculator NZ 2026
Calculate the number of days between two dates, or add and subtract days from any date. Includes calendar days, working days, weeks, months, and years.
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Date Difference Calculator
Break the gap between two dates into years, months and days, the way a person would say it, rather than as a single total. Shows the total in each unit too.
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Dates, age and time questions, answered
Working days and deadlines, ages and anniversaries, countdowns, time zones, school terms and public holidays.
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DAU/MAU Ratio Calculator
Calculate your DAU/MAU ratio from daily and monthly active users. See your product stickiness percentage instantly to measure how often users return.
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Day Countdown Calculator
Free day countdown calculator. Enter a future date to see exactly how many days, weeks, and months are left until it. Counts down to birthdays, holidays, and deadlines.
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Day Counter
Free day counter. Calculate how many days between two dates, how many days until an event, or how many days since a past date.
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Daylight Hours Calculator NZ
Calculate the hours of daylight, and approximate sunrise and sunset, for any latitude and day of the year. Useful across New Zealand from Cape Reinga to Bluff.
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Days Between Dates Calculator
Count the days between two dates, with the total in weeks, the number of working days excluding weekends, and the weekend days in the period.
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Days Inventory Outstanding (DIO) Calculator
Calculate days inventory outstanding from inventory, cost of goods sold and your period. See how many days your stock sits before it is sold.
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Days Payable Outstanding (DPO) Calculator
Calculate days payable outstanding from accounts payable, cost of goods sold and your period. See how long your business takes to pay suppliers on average.
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Days Sales Outstanding Calculator
Work out days sales outstanding from accounts receivable, revenue and the period length. See how many days customers take to pay you on average.
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Days to Years Calculator
Free days to years calculator. Convert any number of days into years, months and leftover days, or into decimal years. Instant, accurate results.
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Days Until Calculator
Count the days remaining until any future date, with the working days left, the number of whole weeks, and how many pay fortnights fall inside the gap.
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dBm to Watts Calculator NZ
Free dBm to watts calculator. Convert dBm to milliwatts or watts, or convert watts back to dBm. Includes a reference table for common RF, wifi and fibre power levels.
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De Broglie Wavelength Calculator
Free de Broglie wavelength calculator. Enter particle mass and velocity (or kinetic energy) to find the de Broglie wavelength, momentum and kinetic energy.
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Housing in Deans Bush
What housing costs in Deans Bush, Christchurch City: median weekly rent $540, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Deanwell
What housing costs in Deanwell, Hamilton City: median weekly rent $450, the ownership and renting split, and household income, from the 2023 Census.
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Debt Avalanche Calculator NZ
Use the debt avalanche method to clear your debts in New Zealand: pay minimums on all and throw spare cash at the highest-rate debt first.
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Debt Avalanche vs Snowball
Grounded NZ guide comparing debt avalanche (highest interest first) vs snowball (smallest balance first): math vs psychology, when each works, real scenarios.
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Debt Consolidation Calculator NZ 2026
Does consolidating your debts into one NZ loan save money? Compare total interest, repayment changes and the break-even point.
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Debt Consolidation vs Avalanche Calculator NZ
Compare consolidating your debts into one lower-rate loan against attacking them with the avalanche method in New Zealand, and see which pays less total interest.
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Debt Consolidation: Rescue or Trap
How debt consolidation works in NZ, when a lower rate but longer term costs more, the CCCFA rules, fees, secured versus unsecured, and free help if you struggle.
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Debt Management
Understand total household debt in NZ: mortgage, student loans, cards and BNPL, good versus risky debt, and the stress warning signs.
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Debt Payoff Strategies
Snowball against avalanche, choosing the right strategy, the behavioural traps, and a step-by-step payoff plan with a real NZ scenario.
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Debt Payoff vs Emergency Fund Calculator NZ
Decide whether to build an emergency fund first or attack your debt in New Zealand, by seeing the extra interest a fund-first approach costs against the security it buys.
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Debt Repayment Calculator NZ
Enter your balance, interest rate and monthly payment to see how long the debt takes to clear, total interest paid and the payoff date. NZ.
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Debt Service Coverage Ratio (DSCR) Calculator
Calculate your debt service coverage ratio from net operating income and total debt service. See how comfortably your income covers loan repayments.
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Debt Service Ratio Calculator NZ 2026
Divide net operating income by annual debt service to assess lending capacity and viability for a NZ property investment.
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Debt Service Ratio Guide
Complete guide to Debt Service Ratio (DSR) for NZ investment properties. Learn NOI calculations, debt servicing, DSR formulas, and strategies for positive cashflow.
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Debt Snowball Calculator
Free debt snowball calculator. Enter your debts and an extra payment to see the payoff order, how long it takes to be debt free, and the total interest.
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Debt to Equity Ratio Calculator
Calculate your debt to equity ratio from total debt and total equity. Measure financial leverage and how much of your business is funded by borrowing.
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Debt vs Invest Calculator NZ
Decide whether to repay debt or invest spare cash in New Zealand by comparing your debt interest rate with an expected after-tax investment return.
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Debt you cannot pay: real situations worked through
Worked situations for debt you cannot pay: 36 real cases with the sums laid out, taken from the guides.
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NZ Debt-to-Income (DTI) Ratio Calculator
Calculate your debt-to-income (DTI) ratio under RBNZ mortgage lending rules. See whether your total debt exceeds the RBNZ DTI limits and how much more you can borrow.
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Debt-to-Income Ratio Guide
Learn how to calculate and improve your Debt-to-Income (DTI) ratio to increase your chances of mortgage approval and better loan terms.
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Decibel Calculator
Calculate decibels from sound intensity in W/m squared, convert dB back to intensity, and add two incoherent sound sources. Uses reference intensity 1e-12 W/m squared.
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Deciding to Sell Your Home in NZ
Whether to sell at all, whether to sell first or buy first, and the full cost of moving in New Zealand before you commit to it.
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Decimal Degrees to DMS Converter
Convert GPS latitude and longitude between decimal degrees and DMS format instantly, with the working shown.
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Decimal Time Converter
Free decimal time converter. Convert hours and minutes to decimal hours and back, for timesheets, payroll, and billing. Quick, accurate, and free.
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Decimal to Binary Calculator
Free decimal to binary calculator. Enter a whole number to convert it to binary, with the hexadecimal and octal forms shown alongside.
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Decimal to Fraction Calculator
Turn any decimal into its simplest fraction, with the mixed number, improper fraction and the greatest common divisor used.
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Decimal to Hexadecimal Converter
Free decimal to hexadecimal converter. Convert any decimal (base 10) number to hexadecimal (base 16) instantly, with the working shown step by step.
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Decimal to Percent Converter
Convert any decimal to a percentage instantly. Free NZ decimal to percent converter with worked example, formula explained, and step-by-step method.
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Decimeter to Meter Converter
Convert decimeters to meters instantly. Free NZ metric length converter with formula, worked example, and common conversion table (dm to m).
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Deck & Fence Cost Calculator NZ 2026
The all-in cost of a deck or fence: enter the size and a supply-and-install rate for materials, labour, extras and a contingency in one total. NZ.
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Deck Joist Spacing Calculator NZ 2026
Work out how many joists a deck needs and the total lineal metres of timber, from the deck width and your joist spacing.
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Deck Stain Calculator NZ
Free NZ deck stain calculator. Enter your deck size, number of coats and coverage rate to work out how many litres of stain you need and the total cost.
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Decking Calculator NZ
Free NZ decking calculator. Enter your deck size and board details to work out the number of boards, lineal metres, and joists you need.
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Deduction Value Calculator NZ 2026
Free NZ calculator showing what a tax deduction is actually worth. A claim does not refund the expense, it reduces your taxable income.
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Deer Gestation Calculator NZ
Work out when a hind is due to fawn from the mating date, with separate gestation lengths for red deer, wapiti and red hinds carrying hybrid foetuses.
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Deferred Revenue Calculator
Work out deferred and recognised revenue from a prepaid contract value, total months and months elapsed. A clear unearned revenue tool for NZ SaaS finance.
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Definite Integral Calculator
Evaluate any definite integral using Simpson's rule. Set your function, bounds and number of subintervals. Returns the integral value and supporting statistics.
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Degree of Unsaturation Calculator
Enter a molecular formula to work out the degree of unsaturation (index of hydrogen deficiency), with step by step working.
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Degrees Minutes Seconds (DMS) Calculator
Free degrees minutes seconds (DMS) calculator. Convert decimal degrees to degrees, minutes and seconds, or DMS back to decimal degrees.
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Degrees Minutes Seconds to Decimal Degrees Converter
Free DMS to decimal degrees converter. Convert degrees, minutes and seconds coordinates to decimal degrees instantly, with the reverse conversion shown too.
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Degrees of Freedom Calculator
Free degrees of freedom calculator. Work out df for a one-sample t-test, two-sample t-test (pooled or Welch), paired t-test, chi-square test, and one-way ANOVA.
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Degrees to Minutes Converter
Free degrees to minutes converter. Convert decimal degrees to arcminutes (and full degrees-minutes-seconds), with the reverse conversion and worked examples.
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Degrees to Radians Calculator
Convert angles from degrees to radians instantly. Enter any degree value and get the exact radian equivalent, the decimal value, and the angle in gradians.
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Degrees to Seconds Converter
Convert degrees to arcseconds (1 deg = 3,600 arcsec) and to seconds of time (1 deg = 240 sec) instantly.
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Dehumidifier Running Cost Calculator NZ
Work out what running a dehumidifier costs in New Zealand, per day and per year, from its power rating, hours of use and your electricity price.
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Housing in Delaney
What housing costs in Delaney, Lower Hutt City: median weekly rent $300, the ownership and renting split, and household income, from the 2023 Census.
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Delta to Wye Conversion Calculator
Free delta to wye (Y-Δ) conversion calculator. Enter three delta resistor values to get the equivalent star (wye) resistances, or convert wye back to delta.
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Density Altitude Calculator NZ
Free density altitude calculator. Enter airfield elevation, temperature and pressure to work out density altitude for aircraft performance planning.
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Density Calculator
Calculate density, mass, or volume using density = mass / volume. Returns density in g/cm3 and kg/m3, with material comparison and a full worked example.
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Density Conversion Calculator
Free density conversion calculator. Convert between kg/m3, g/cm3, kg/L, lb/ft3, lb/gal (US) and oz/in3 instantly, with the full working shown step by step.
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Density Converter
Convert density between kg/m3, g/cm3, kg/L, lb/ft3, lb/gal US, and oz/in3. Enter any density value and see all common units at once with instant results.
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Density Mass Volume Calculator
Solve density = mass / volume for any variable, with a material picker for water, steel, aluminium and wood, and instant unit conversion.
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Density of a Cylinder Calculator
Free density of a cylinder calculator. Enter radius (or diameter), height and mass to get volume and density in kg/m3 or g/cm3. Step by step working shown.
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Density to Mass Calculator
Free density to mass calculator. Enter density and volume to find mass using mass = density x volume. Supports kg/m3, g/cm3, g/mL and more, with common material presets.
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Density to Weight Calculator
Free density to weight calculator. Enter density and volume to find mass (kg) and true weight in newtons using weight = density x volume x gravity.
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Dental Costs in New Zealand: How to Pay Less
Most adult dental care in New Zealand is user-pays. Learn about free care for under-18s, WINZ dental grants, ACC for injuries, and how to pay less.
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Deposit at Risk Calculator NZ
Failing to settle costs more than the deposit: the vendor's loss on a resale, default interest, and what you can be pursued for beyond it. NZ.
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Deposit Gap Calculator NZ
Work out the gap between the deposit you have and the deposit you need for a home in New Zealand, including KiwiSaver.
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Deposit in Trust Calculator NZ
The deposit on your house sale is held in trust, released later than you think, and the agent takes their commission out of it first.
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Deposit Required by LVR Band Calculator NZ 2026/27
The deposit and loan needed at 30%, 20%, 15%, 10% and 5% LVR for any purchase price, and how the RBNZ restrictions apply. Free NZ calculator.
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Depositor Compensation Scheme
New Zealand's Depositor Compensation Scheme protects deposits up to $100,000 per person, per bank, from 1 July 2025. See what is covered and how the cap works.
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Depreciation Calculator NZ 2026
Straight-line or diminishing value: enter asset cost, residual value and useful life for annual depreciation and a full schedule. NZ methods.
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Depreciation for Business Assets
What depreciation means for business assets in New Zealand, why you spread the cost over time, how rates and methods work, and what happens when you sell an asset.
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Depreciation Recovery Calculator NZ
Calculate depreciation recovery income when you sell a business asset for more than its adjusted tax value in New Zealand.
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Derivative Calculator
Calculate the numerical derivative of any function at a point using the central difference method. Enter f(x) and a value of x to get f prime instantly.
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Housing in Devonport
What housing costs in Devonport, Auckland: median weekly rent $576, the ownership and renting split, and household income, from the 2023 Census.
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Dew Point Calculator
Calculate the dew point from air temperature and relative humidity using the Magnus formula. Free dew point calculator in degrees Celsius, with a comfort guide.
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Diagonal of a Rectangle Calculator
Free diagonal of a rectangle calculator. Enter length and width to instantly find the diagonal using the Pythagorean theorem, plus perimeter, area and diagonal angle.
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Diagonal of a Square Calculator
Free diagonal of a square calculator. Enter the side length to find the diagonal (d = s times root 2), or enter the diagonal to find the side length.
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Diagonalize Matrix Calculator
Diagonalise a 2x2 or 3x3 matrix: eigenvalues, eigenvectors, D and P, with A = PDP^-1 shown step by step.
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Diameter of a Circle Calculator
Free diameter of a circle calculator. Work out the diameter from the radius, area, or circumference. Instant results with the formulas shown step by step.
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Diameter to Radius Calculator
Free diameter to radius calculator. Convert diameter to radius (and back) instantly, plus circumference and area. Works with mm, cm, m, inches and feet.
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Housing in Diamond Harbour
What housing costs in Diamond Harbour, Christchurch City: median weekly rent $380, the ownership and renting split, and household income, from the 2023 Census.
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Dice Probability Calculator
Calculate the probability of any sum when rolling multiple dice. Shows P(sum=target), exact fraction, percentage, and a full probability distribution table.
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Diceware Passphrase Generator NZ
Generate a strong, memorable passphrase from random words, with an entropy estimate. Choose the number of words and separator. Runs entirely in your browser.
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Diesel RUC Calculator NZ
Free NZ diesel RUC calculator for light utes, vans and 4WDs under 3,500 kg. Light diesel pays $76.00 per 1,000 km. Work out annual charges, admin fees and cost per km.
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Differential Pressure Calculator NZ
The pressure difference between two points in kPa, bar, psi, Pa or mmH2O, with flow across an orifice or filter estimated.
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Diffraction Grating Calculator
Free diffraction grating calculator. Work out diffraction angle, wavelength, or grating spacing using d sin(theta) = m lambda. Enter lines per mm, order and wavelength.
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Digit Sum Calculator
Free digit sum calculator. Enter a number to get the sum of its digits, the digital root, and the digit count.
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Digital Advertising Break Even Calculator
The maximum cost-per-click your campaign can afford: enter conversion rate, order value and target margin for your break-even CPC.
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Digital Root Calculator
Free digital root calculator. Enter any whole number and instantly see its digital root, the step-by-step digit sum working, and whether the number is a multiple of 9.
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Digital Wallets NZ
How tokenisation makes paying by phone safer than handing over a card, what a digital wallet costs you, and the one fraud that targets wallets specifically.
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Dilution Calculator (C1V1 = C2V2)
Free online dilution calculator using C1V1 = C2V2. Solve for any unknown: initial concentration, initial volume, final concentration, or final volume.
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Dilution Factor Calculator
The dilution factor, ratio and diluent volume from stock to working concentration, using C1V1 = C2V2.
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Dilution Ratio Calculator
Free dilution ratio calculator. Enter a mixing ratio like 1:10 or 1:32 and a target total volume to get the exact amount of concentrate and water to use.
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Dimensions of a Rectangle Calculator
Free dimensions of a rectangle calculator. Work out the length and width from the area and perimeter, area and one side, or perimeter and one side.
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Dimes to Dollars Calculator
Convert dimes to dollars or dollars to dimes instantly. Enter any number of dimes and see the dollar value, or reverse. Fast, free, accurate coin converter.
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Housing in Dingwall
What housing costs in Dingwall, Auckland: median weekly rent $600, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Dinsdale North
What housing costs in Dinsdale North, Hamilton City: median weekly rent $460, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Dinsdale South
What housing costs in Dinsdale South, Hamilton City: median weekly rent $450, the ownership and renting split, and household income, from the 2023 Census.
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Direct Variation Calculator
Free direct variation calculator. Enter a known x and y pair to find the constant k, then predict y for any other x, using y = kx.
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Disability Allowance Explained
Who qualifies for the Disability Allowance, the costs it covers, the weekly maximum and income test, and how to apply. You need not be on a benefit.
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Discount Calculator NZ 2026
Calculate any discount instantly. Enter the original price and discount amount, percentage, or final price to find the missing values.
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Discount Stacking Calculator NZ
Work out the final price when several discounts are applied one after another in New Zealand, and see the total saved and the true effective discount.
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Discounted Payback Period Calculator
Find how long an investment takes to pay back using discounted cash flows. The discounted payback period allows for the time value of money at your chosen rate.
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Discounted Payback Period Guide
Learn how to calculate and use the Discounted Payback Period (DPB) to evaluate investment projects and capital budgeting decisions with time value of money.
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Discriminant Calculator
Calculate the discriminant of a quadratic: Delta = b squared minus 4ac. Returns the discriminant value, root type classification, and both roots when they exist.
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Displacement Calculator
Calculate displacement using s = ut + 0.5at² or s = (v²-u²)/2a. Returns displacement in metres, distance fallen, or position from velocity, acceleration and time.
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Displacement Calculator (s = ut + ½at²)
Free displacement calculator. Solve s = ut + half a t squared for displacement, initial velocity, acceleration or time. A SUVAT equation of motion.
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Disposable Income Calculator NZ 2026
Your true disposable income after every fixed and variable expense: what is left each month once bills, debt and living costs are covered.
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Disputes Tribunal and Complaints
How to resolve a money dispute in NZ: write an effective complaint, use free ombudsman schemes, and take a claim to the Disputes Tribunal, now up to $60,000.
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Distance Calculator
Free distance calculator. Enter two latitude and longitude coordinates to get the straight-line (great-circle) distance between them in kilometres and miles.
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Distance Formula Calculator
Calculate the distance between two coordinate points using the distance formula. Also returns the midpoint, slope, and line equation for the two points.
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Distance From Point to Plane Calculator
Enter a point and a plane equation ax + by + cz + d = 0 to find the shortest perpendicular distance, with full working shown.
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Distance to Horizon Calculator
Free distance to horizon calculator. Enter your eye height or altitude to work out how far away the horizon is, with and without atmospheric refraction.
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Diversification
Why single-asset exposure is risky: property against shares and cash, sector concentration, geographic spread and a NZ bank shares scenario.
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Dividend Calculator NZ
Free NZ dividend calculator. Work out your cash dividend, attached imputation credits, gross dividend, resident withholding tax, and the net dividend in your hand.
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Dividend Imputation Gross-Up Calculator NZ
Gross up an imputed New Zealand dividend: add the imputation credit, tax the gross dividend at your marginal rate, and see the extra tax to pay or the credit left over.
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Dividend Income - How Shares Pay You (NZ)
Dividends, yield and NZ imputation credits, dividend against growth investing, reinvesting, and an NZX company scenario.
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Dividend Reinvestment Calculator NZ
The long-term power of reinvesting dividends versus taking cash: how reinvested dividends compound alongside share price growth. NZ.
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Dividend Reinvestment Plan Calculator NZ
See how reinvesting dividends through a DRP grows a New Zealand share investment over time, compared with taking the dividends as cash and relying on price growth alone.
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NZ Dividend Tax Calculator 2025-26
Calculate the net tax on NZ dividends including imputation credits. Find out if you owe a top-up payment or get a refund, based on your personal tax rate.
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Dividend Yield Calculator NZ
Work out the dividend yield and annual income from a share holding in New Zealand, including gross yield with imputation credits.
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Dividing Exponents Calculator
Free dividing exponents calculator. Divide powers with the same base or different bases, apply the quotient of powers rule, and see the full working shown step by step.
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Dividing Fractions Calculator
Divide two fractions instantly. Enter any numerators and denominators, and get the lowest-term answer with a clear step-by-step method using the keep, change, flip rule.
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Divisor Function Calculator
Free divisor function calculator. Enter n to get sigma(n), the sum of all divisors, the number of divisors, and the sum of the proper divisors.
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Housing in Dixon Street East
What housing costs in Dixon Street East, Wellington City: median weekly rent $550, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Dixon Street West
What housing costs in Dixon Street West, Wellington City: median weekly rent $550, the ownership and renting split, and household income, from the 2023 Census.
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DNA Concentration Calculator
Free DNA concentration calculator. Convert A260 UV absorbance readings to ng/uL, work out total yield, molarity, and the dilution needed for PCR or sequencing.
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DNA to mRNA Converter
Free DNA to mRNA converter. Paste a DNA coding or template strand and get the transcribed mRNA sequence instantly, with base counts and GC content.
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Housing in Dobson
What housing costs in Dobson, Grey District: median weekly rent $200, the ownership and renting split, and household income, from the 2023 Census.
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Dog Age Calculator
Convert your dog's age to human years using the science-based formula, not the old times-seven myth. Free dog age calculator with the method explained.
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Dog Chocolate Toxicity Calculator NZ
Estimate the theobromine dose a dog has swallowed from the chocolate type, the amount and the dog's weight. Ring a vet immediately, whatever it says.
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Dollar-Cost Averaging
How dollar-cost averaging works: investing a fixed amount regularly to smooth out the price you pay, remove the stress of timing, and build a steady habit.
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Dollar-Cost Averaging Calculator NZ
Project the outcome of investing a fixed amount regularly over time, the dollar-cost averaging approach.
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Domain and Range Calculator
Free domain and range calculator. Choose a function type and parameters to get its domain and range.
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Housing in Dome Valley-Matakana
What housing costs in Dome Valley-Matakana, Auckland: median weekly rent $550, the ownership and renting split, and household income, from the 2023 Census.
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NZ Donation Tax Credit 2026
The New Zealand donation tax credit: claim 33.33% of donations to approved donee organisations, the $5 minimum, the income cap, and how to claim through myIR.
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Donation Tax Credit Calculator NZ
Calculate your New Zealand donation tax credit at 33.33% of donations made to approved charities, capped at your taxable income. Enter donations and income.
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Donation Tax Credits NZ
The 33.33% donation tax credit: claiming via IR526 and myIR, approved donees, payroll giving, tithing, Givealittle and the records needed.
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Housing in Doncaster
What housing costs in Doncaster, Tauranga City: median weekly rent $600, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Donegal Park East
What housing costs in Donegal Park East, Auckland: median weekly rent $600, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Donegal Park West
What housing costs in Donegal Park West, Auckland: median weekly rent $590, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Donnelly Park
What housing costs in Donnelly Park, Horowhenua District: median weekly rent $402, the ownership and renting split, and household income, from the 2023 Census.
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Doppler Effect Calculator
Observed frequency for moving sources and observers, with the frequency shift and wavelength change for approach and recession.
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Dot Product Calculator NZ
Calculate the dot product of two 3D vectors, plus the angle between them and each vector's magnitude. Enter the components to get the scalar product instantly.
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Double Angle Calculator
Free double angle calculator. Enter an angle to get sin(2x), cos(2x) and tan(2x) using the double angle identities, with a worked example.
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Double Angle Formula Calculator
Enter an angle x and see every double angle identity worked: sin(2x), all three forms of cos(2x), and tan(2x), with a worked example.
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Double Angle Identities Calculator
Check sin(2x), cos(2x) in all three forms and tan(2x) against each other, with a worked example and an identity reference table.
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Double Glazing Payback Calculator NZ
Estimate the payback period on double glazing in New Zealand by comparing the heating energy it saves against the install cost.
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Housing in Doubtless Bay
What housing costs in Doubtless Bay, Far North District: median weekly rent $350, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Douglas
What housing costs in Douglas, Stratford District: median weekly rent $186, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Douglas Park
What housing costs in Douglas Park, Masterton District: median weekly rent $386, the ownership and renting split, and household income, from the 2023 Census.
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Downgrade Rate Calculator
Calculate your downgrade rate from customers who moved to a lower plan and your total customers. See the percentage reducing spend over the period.
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Download Time Calculator
Calculate how long a file will take to download at any internet speed. Returns time in hours, minutes and seconds, plus a comparison table across common speeds.
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Downsizing and Releasing Home Equity - NZ
Downsizing in NZ: releasing equity, cashflow improvement, the lifestyle trade-offs, retirement planning and reverse mortgages.
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Downsizing Net Gain Calculator NZ
Work out the cash freed up by selling your home and buying smaller in New Zealand, after selling and moving costs.
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DPI and PPI Calculator
Calculate screen PPI from resolution and diagonal size, or find image pixel dimensions from DPI and print size.
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Drag Equation Calculator
Solve the drag equation F = 0.5 x rho x v^2 x Cd x A for any variable. Enter drag force, density, speed, drag coefficient or frontal area to find the missing one.
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Drag Force Calculator NZ
Calculate the aerodynamic drag force on an object from air density, speed, drag coefficient and frontal area. See the power needed to overcome it at that speed.
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Drake Equation Calculator
Estimate detectable civilisations in the Milky Way from star formation, planet fraction, habitability and civilisation lifespan.
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Drake Equation for Love Calculator
How many potential partners you might realistically meet: population, age range, availability, proximity and compatibility, step by step.
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Drawdown Calculator NZ
See how long a retirement lump sum lasts at a chosen withdrawal rate and return in New Zealand.
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Drawings vs Deductible Expenses Calculator NZ 2026
Drawings are not expenses: the profit you are actually taxed on, what you can safely draw after tax and ACC, and the shortfall if confused. NZ.
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Drench Dose Checker NZ
Drench volume per animal from your own product label's dose rate, worked to the heaviest in the mob and totalled against the pack size.
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Driveway Cost Calculator NZ 2026
Choose concrete, exposed aggregate, asphalt or paving and enter the area for materials, prep, contingency and price per m2. NZ rates.
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Driveway Surface Cost Estimator NZ 2026
Estimate your NZ driveway surface cost. Compare concrete, exposed aggregate, asphalt, pavers, and chip seal prices per m². Includes site prep and GST. Instant results.
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Driving Lessons Cost Calculator NZ
Lesson, test and licence fees across the learner, restricted and full stages, added up so you can plan the total cost. NZ.
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Drops to mL Conversion Calculator NZ
Free drops to mL conversion calculator. Convert drops (gtt) to millilitres and back using standard, medicine dropper, or IV drop factor rates (10, 15, 20, 60 gtt/mL).
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Housing in Drury East
What housing costs in Drury East, Auckland: median weekly rent $550, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Drury South Crossing
What housing costs in Drury South Crossing, Auckland: median weekly rent $625, the ownership and renting split, and household income, from the 2023 Census.
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Housing in Drury West
What housing costs in Drury West, Auckland: median weekly rent $628, the ownership and renting split, and household income, from the 2023 Census.
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DTI Calculator NZ 2026
Calculate your debt-to-income (DTI) ratio to understand your borrowing position. Enter monthly debt payments and gross income.
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Due Date Calculator
Free pregnancy due date calculator. Enter the first day of your last menstrual period to estimate your baby's due date.
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Housing in Dunedin Central
What housing costs in Dunedin Central, Dunedin City: median weekly rent $450, the ownership and renting split, and household income, from the 2023 Census.
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Dunk Calculator
Enter your standing reach and rim height to see the vertical jump you need to touch the rim and to dunk with clearance. Uses the standard 305 cm (10 foot) rim.
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Housing in Dunstan-Galloway
What housing costs in Dunstan-Galloway, Central Otago District: median weekly rent $300, the ownership and renting split, and household income, from the 2023 Census.
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Duodecimal Converter
Free duodecimal converter. Enter a decimal whole number to convert it to duodecimal (base 12), using digits 0-9 then A and B, with the binary form.
Listed from the site's own index of its pages, rebuilt whenever pages change. Last reviewed 2026-09-07. See also every question the site answers, the finance glossary and the guides.