New Zealand's largest free calculator and financial literacy platform.
Fast, accurate, NZ-specific calculators and free financial literacy guides for tax, mortgages, KiwiSaver, GST and every major money decision. Pick a category below or search.
“The definitive source for free, accurate, NZ-specific financial tools, trusted by Kiwis from Kaitaia to Invercargill.”
Founder · 15+ years building free NZ calculators
Everything we do, in one place
Tax & PAYE
PAYE, income tax, GST, provisional tax and ACC levies.
Mortgage & Property
Repayments, deposits, refix savings and property tax.
KiwiSaver & Retirement
Projections, NZ Super, drawdown and safe withdrawal.
Investing & Savings
Returns, funds, compound interest and term deposits.
Debt & Loans
Payoff plans, consolidation, car and personal loans.
Insurance
Life, house, contents, income protection and excess.
Business & GST
GST, company tax, imputation, margins and break-even.
Maths & Stats
Algebra, geometry, trigonometry and statistics.
Science & Engineering
Mechanics, energy, electrical and chemistry tools.
Converters
Length, area, weight, currency and measurement.
Everyday & Building
Paint, tiles, fuel, dates, health and shopping.
Learning Center
Plain-English financial literacy for every life stage.
New Zealand's free calculator and financial literacy platform
Calculate.co.nz is New Zealand's largest free collection of online calculators and financial literacy guides, built so that Kiwis can get fast, accurate answers to everyday money questions without a sign-up, a paywall or a sales pitch. The platform brings together 1,179 calculators, 250 plain-English guides and 50 reference datasets, all built for New Zealand rules and updated for the 2026/27 tax year. The goal is simple: make the numbers behind tax, property, KiwiSaver and everyday spending easy enough for anyone to understand and act on.
Some of the most used tools include the Tax Refund Calculator for working out whether you are owed money by IRD, the PAYE and salary calculator for take-home pay after tax, ACC and KiwiSaver, and the GST Calculator for adding or removing 15 percent GST. Drivers reach for the Fuel Cost Calculator to price a trip per kilometre, home buyers use the Mortgage Calculator and KiwiSaver Calculator to plan ahead, and investors with overseas shares rely on the FIF Calculator.
Every calculator sits within a wider category so you can find related tools quickly: Tax & Savings, Mortgage & Property, Financial, Insurance, Maths & Statistics, Science & Engineering, Everyday & Building and Converters. For background reading, the Learning Center explains the why behind the numbers, and the Reference Data section keeps current NZ tax rates, thresholds and wage figures in one place. Everything is free, independent and made in New Zealand.