Calculators that show their working
Free, fast tools for the questions a search box can't answer in one line — mortgages, take-home pay, dates, conversions and more. Every tool explains the method underneath, so you can check the number rather than trust it.
- Money & PropertyMortgages, tax, pay and savings — worked out properly, with the numbers shown.1 tool
- Health & BodyBody measurements, training numbers and everyday health reference figures.Coming soon
- Time & DatesAges, date differences, working days and countdowns.Coming soon
- ConvertersUnits, sizes, cooking measures and temperatures.Coming soon
- Text ToolsCounting, cleaning and transforming text.10 tools
- Developer ToolsEncoders, formatters, generators and validators.Coming soon
About these tools
There are 11 tools live so far, with more added regularly. Everything runs in your browser — nothing you type is sent anywhere or stored, and there is no sign-up.
Each tool page shows the formula it uses and a worked example with real numbers, because a figure you can't check isn't much use.