About Calculator ToolBox

Calculator ToolBox is a free collection of everyday tools that run entirely in your browser: health calculators (BMI, BMR, body fat), a full set of interest and loan calculators with inflation adjustment, hardware testers (keyboard, mouse, touch screen, refresh rate, display colors), a realtime clock with stopwatch and timer, an IP lookup with a map, an online whiteboard, and a board-game collection with more than 40 chess variants and classics like Go, Gomoku, and Backgammon.

There are no accounts and no database. Numbers you type into a calculator never leave your device; whiteboard drawings are saved in your own browser; online chess moves travel directly between the two players. The site is supported by advertising instead of collecting your data — the details are in the Privacy Policy.

The calculators use standard published formulas (Mifflin-St Jeor for BMR, the U.S. Navy method for body fat, the Fisher equation for real interest, and so on), and every calculator page documents its formula and sources in the guide below the tool. They are educational estimates, not professional advice — see the Terms of Use.

Found a bug, a wrong number, or want to suggest a tool or game? Email contact@calculator-toolbox.com — reports and ideas are welcome.