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Free calculators for money, mortgages and everyday maths. Choose a tool, enter your figures and see how the answer is worked out.
Try a mortgage calculation
Your figures. Your monthly repayment.
Estimated monthly repayment USD
Principal and interest at a fixed rate. Excludes fees, taxes and insurance.
Open full mortgage calculatorPopular calculators
Money and everyday maths, with local tax tools clearly labelled.
- MoneyMortgage repayment calculator
See monthly repayments and the cost of interest.
- MoneyNZ GST calculator
Add GST or find the tax included in a price.
NZ$100 + 15% GST = NZ$115
- MoneyNZ take-home pay calculator
Estimate your pay after New Zealand deductions.
- MoneyLoan repayment calculator
Work out repayments over the life of a loan.
- Everyday mathsPercentage calculator
Find a percentage of any amount.
15% of 80 = 12
- MoneyCompound interest calculator
Explore how savings grow with regular deposits.
- Dates & ageAge calculator
Calculate age in years, months and days.
- Dates & ageDate difference and add days
Count the days between dates or add days.
- HealthBMI calculator
Calculate body mass index from height and weight.
- Conversions & everyday toolsUnit conversion calculator
Convert everyday measurements between units.
1 km = 1,000 m
- MoneyMortgage Affordability Calculator
Estimate a mortgage that fits your budget.
- MoneySimple Interest Calculator
Work out interest earned on a fixed starting amount.
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Plan borrowing, savings and tax.
34 calculatorsEstimate materials for your next project.
5 calculatorsCompare energy costs and potential savings.
2 calculatorsWork out percentages and everyday sums.
2 calculatorsCompare costs, margins and returns.
5 calculatorsExplore body measurements and health estimates.
1 calculatorCalculate ages and time between dates.
2 calculatorsConvert everyday measurements between units.
1 calculatorFind a tool for your next calculation.
1 calculatorUnderstand the answer
Start with your figures
Choose a tool and enter the amounts, dates or measurements you want to work with.
Explore the result
Change an input to compare scenarios and see what makes a difference.
See how it works
Read the formula, worked example and limitations before using your estimate.
Find the right calculator
Money & business
- NZ PAYE tax calculator
- NZ take-home pay calculator
- NZ GST calculator
- NZ provisional tax calculator
- NZ holiday pay calculator
- NZ redundancy payout calculator
- NZ ACC earner levy calculator
- NZ student loan repayment calculator
- NZ KiwiSaver retirement projection
- NZ KiwiSaver contribution calculator
- NZ mortgage calculator: repayments, refix and affordability
- NZ rental yield calculator
- NZ bright-line period calculator
- First-home deposit timeline NZ
- AU FIFO roster gross pay
- NZ fringe benefit tax scenario
- Compound interest calculator
- Loan repayment calculator
- Mortgage Affordability Calculator
- ROI Calculator
- Profit Margin Calculator
- Markup Calculator
- Break-Even Calculator
- Tip and split calculator
- Hourly to Salary Calculator
- Simple Interest Calculator
- Mortgage repayment calculator
- US paycheck estimate — 2026
- US federal income tax — 2026
- UK take-home pay — 2026/27
- UK stamp duty — England & Northern Ireland
- Australia income tax & Medicare — 2026/27
- Pension Tax Allowance & the 53% taper zone (£13,037–£13,319) — 2027/28
- Mortgage calculator
- Tradie job quote calculator
- UK £100k tax trap calculator
- UK High Income Child Benefit Charge calculator
- AU $1,000 work expense deduction calculator
- US no tax on tips and overtime calculator
Everyday sums
Home & materials
Health measures
Use the right local rules
Tax and property rules depend on where you live. Choose a region before entering your figures.