Calculators and converters for everyday questions

ConverterHub is a collection of more than 3,700 free calculators, converters and everyday tools: loans, interest and tax; health and fitness; maths, statistics and physics; unit and time conversions; text, encoding and developer utilities. There is nothing to install and no account to create.

Every result is computed on our server by a formula written for that tool, and more than 5,000 automated test cases are run before each release. The most-used tools also have a guide: how the result is calculated, a worked example whose numbers come from the tool itself, and the mistakes people commonly make. Where a rule depends on the country or the year, such as a tax bracket or a legal limit, the guide says which rule the tool applies.

Search for a tool below, or read how the tools are built and checked.