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A powerful expression-based calculator, unit converter, and computation engine

Mather is a powerful, simple-to-use, no BS expression-based computation engine. In addition to basic calculator arithmetic, it supports all of the following. Powered by Math.js.

  • Variables
  • User-defined functions
  • Easily-accessible math constants, e.g. 'pi'
  • Complex math expression evaluation
  • Trigonometric functions
  • Unit conversions (and more general unit arithmetic)
  • Complex numbers
  • Matrices
  • and more


Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid