Everyday calculators, all in one place
Free online calculators — fast, mobile-friendly and with clear explanations. We start with percentages; more categories are on the way.
Math
Units
Date & Time
Health
Data
More calculators are on the way.
Why Convert the World?
Convert the World brings the calculators and converters you need every day together in one place — free, fast and without sign-up. We are building towards around 100 tools for everyday life, programming and construction, including in-browser converters for currencies and file types such as JPEG or MP4. Every calculator explains what it computes, so you get an answer you can actually understand.
Free, no sign-up
Every tool is free to use — no account, no paywall, no download.
Clear explanations
Each calculator explains the formula behind the result, not just the number.
App-like access
A Progressive Web App is planned, so you can pin your calculators straight to your home screen.
Works everywhere
Everything runs right in the browser tab — no installs, just as fast on your phone as on a desktop.