About

Math Tools is a free collection of calculators, unit converters, reference tables, and number facts — built to be fast, ad-supported instead of paywalled for the basics, and useful for a quick lookup without an account.

Every tool on the site runs real calculations, not lookup tables of pre-baked answers — from unit conversions and base-number arithmetic to number theory facts like primality and prime factorization. The same math also powers our Numbers API and MCP server, for developers and AI agents who want programmatic access.

Math Tools is built and operated by Orthosie. Questions, bug reports, or feedback are always welcome — get in touch.