ConvertAll — The Complete Guide: A Unit Converter That Understands Any Combination of Units
ConvertAll, by Doug Bell, is an open-source unit converter under GPL-2.0. Instead of choosing from a fixed list of categories, you type any combination of units, and it checks that the dimensions match and converts. It was rewritten in Flutter and runs on Windows, Linux, Android and in the browser.
ConvertAll
Doug Bell
Flexible unit converter that lets you combine units freely, with SI prefixes, fractions and results in engineering notation.
Get it from the vendorWhat you get
- Free-form combinations — kN/m², L/s, kWh or any other compound unit.
- Dimension checks — it refuses to convert between incompatible units.
- SI prefixes — on any unit, from milli to giga.
- Search as you type — quick filtering of the unit list.
- Engineering notation and fractions — results shown in a calculation-friendly form.
Who it suits
Engineers and students who need quick checks of pressure, flow, energy and load conversions between SI and imperial units, for example when reading an American catalogue. Limitation: there is no macOS version, and it converts units only rather than being a full calculator.
Related tools
For a desktop calculator that carries units through a whole expression — Qalculate!. For unit conversion and calculation on the command line and in scripts — GNU Units. For documented engineering calculations with units — SMath Studio.
Qalculate!
Hanna Knutsson
A smart desktop calculator — full unit conversion, physical constants, uncertainty propagation and symbolic algebra.
Get it from the vendor
GNU Units
GNU Project (Adrian Mariano and contributors)
Command-line unit converter and calculator that tracks units through a calculation, with a database of thousands of units.
Get it from the vendorThe bottom line
A simple, clever unit converter that prevents mistakes in compound conversions. If you also need full calculations with units, add a dedicated calculator.