Every question this site answers
Across the calculators and guides on Calculate.co.nz there are 8,807 questions with answers, written alongside the tool that works each number out. Until now each one sat at the foot of a single page, which is no use if you do not already know which page to open. This index gathers them in one place so you can search the lot, or read a subject end to end.
Answers are drawn from 2,546 pages, and every one links back to the calculator or guide it came from so you can put your own figures in. This is general information for education, not financial advice.
Tax, KiwiSaver and entitlements
Income tax and PAYE 473 answered
Tax codes and secondary tax, PAYE deductions, brackets and marginal rates, refunds, and what actually lands in your account.
GST and business tax 369 answered
GST on a price or a total, provisional tax, company tax, fringe benefit tax, entertainment, mileage and what a contractor owes.
Leave and pay entitlements 241 answered
Annual leave, sick leave and public holidays, parental leave, redundancy and notice, trial periods and how each is paid.
KiwiSaver 172 answered
Contributions and the government contribution, employer rates and ESCT, funds and fees, first home withdrawals and what happens on death.
Benefits, ACC and student support 124 answered
ACC levies and weekly compensation, Working for Families, the Accommodation Supplement, superannuation, student loans and allowances.
Tax on investments and property 51 answered
The bright line test, foreign investment fund rules, tax on interest and dividends, PIE rates and rental income.
Mortgages and property
Buying a home 315 answered
Deposits and first homes, what a place really costs to own, rates and insurance, building, and buying against renting.
Mortgages and lending 238 answered
Repayments and interest, fixed against floating, refinancing and break fees, offset and revolving credit, and what a bank will lend.
Renting, flatting and landlords 162 answered
Rent affordability and flatmates, bonds, rental yield, healthy homes, boarders and the sums a landlord runs.
Selling a home 160 answered
Agent commission and what it covers, auctions and marketing, appraisals, settlement, and what is left after a sale.
Saving, investing and borrowing
Budgeting and prices 593 answered
Household budgets, splitting costs, comparing prices and working out what something really costs you.
Running a business 475 answered
Margins and break even, cash flow and runway, pricing, subscription revenue, customer value and the true cost of an employee.
Saving and investing 323 answered
Compound interest, managed funds and fee drag, term deposits, shares and dividends, and what a return really nets you.
Retirement planning 118 answered
How long savings last, what an income in retirement takes, drawdown rates and the gap between a plan and a number.
Loans and debt 88 answered
Personal loans and car finance, credit cards, hire purchase and buy now pay later, and the order to clear debts in.
Currency and inflation 48 answered
Exchange rates and the spread a bank takes, what inflation does to a sum over time, and comparing prices across years.
Everyday money and life admin
Sizes and everyday sums 627 answered
Ring and clothing sizes, quantities and servings, splitting a bill, tipping, and the small sums that come up in a day.
Units and conversions 561 answered
Metric and imperial, length and weight and volume, temperature, cooking measures and the conversions people look up most.
Vehicles and travel 223 answered
What a car costs to run, road user charges, fuel against electricity, trips and distances, and comparing a commute.
Text, data and digital tools 213 answered
Word and character counts, password and text generators, number bases, encoding, colours and file sizes.
Health and the body 156 answered
Calories and macros, body mass index, hydration, heart rate, pregnancy dates and the numbers behind a health goal.
Dates, age and time 153 answered
Working days and deadlines, ages and anniversaries, countdowns, time zones, school terms and public holidays.
Household running costs 126 answered
Electricity and heating, water, appliances, a pool, solar and insulation, and what each thing costs to keep going.
Home, garden and building jobs 120 answered
Paint, tiles, timber and decking, fencing, soil and mulch, roofing and carpet, and how much of a material a job takes.
Insurance
Insurance 69 answered
How much cover to hold, life and income protection, health, house and contents, excesses, premiums and what a policy pays.
Guides and learning
Guides and learning 95 answered
Questions answered in the written guides, from budgeting and KiwiSaver to household spending and employment agreements.
Maths and statistics
Geometry and shapes 525 answered
Area, perimeter, volume and surface area for the common shapes, plus angles, triangles and trigonometry.
Ratios and percentages 412 answered
Percentage change and percentage of a number, ratios and proportions, scale, averages and rounding.
Numbers and algebra 396 answered
Equations and solvers, fractions, roots and powers, prime numbers, matrices, sequences and number theory.
Statistics and probability 191 answered
Averages and spread, confidence intervals and significance tests, distributions, correlation, sampling and combinations.
Calculus and functions 51 answered
Derivatives and integrals, limits, functions and their inverses, and the notation that goes with them.
Science and engineering
Materials, fluids and heat 490 answered
Density and mass, concrete and steel, loads and stress, pressure and flow, heat transfer and thermal performance.
Physics and motion 198 answered
Force, energy, work and power, velocity and acceleration, momentum, torque, projectiles, waves and optics.
Electrical 153 answered
Voltage, current and resistance, power and energy, resistors and capacitors in series and parallel, batteries and cable sizing.
Chemistry 98 answered
Moles and molarity, pH and acids, dilution and concentration, reaction energy and the gas laws.
Every answer here is published on the page that owns it as well, which is where any rate or threshold is kept current. Last reviewed 2026-09-06. See also the finance glossary, the guides, the reference data and the financial literacy test.