Calculators & converters
Everyday math with the method shown: loans and EMIs with full amortization, compound growth, VAT and margins in any currency, dates, ages, units and time zones.
Percentage Calculator
Percent of a number, what percent one number is of another, and percentage change.
Loan & EMI Calculator
Monthly payment (EMI), total interest and a full amortization schedule, any currency.
Compound Interest Calculator
See how savings grow with compound interest and monthly contributions.
VAT & Sales Tax Calculator
Add or remove VAT, GST or sales tax at any rate, in any currency.
Profit Margin Calculator
Margin, markup and profit from cost and price, or the price for a target margin.
BMI Calculator
Body mass index for adults in metric or US units, with the WHO categories.
Age Calculator
Exact age in years, months and days, plus total days and the next birthday.
Date Calculator
Days between two dates (incl. business days), or add and subtract days, weeks, months.
Unit Converter
Length, weight, temperature, area, volume, speed, data, pressure, energy and more.
Time Zone Converter
Convert a time between cities and plan meetings across time zones.
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Calculators & converters: common questions
How are results calculated?
Each calculator shows its formula, the assumptions it makes and a worked example on its page.
Can I convert or calculate many values at once?
The unit converter has a bulk mode for a list of values, with a CSV download.
Can I rely on the loan and tax results?
They are accurate for the inputs and formulas shown, but lenders and tax offices may round, add fees or use other rules. Use them for planning and check with the provider.