About UnitRatio

UnitRatio is built and maintained by Nan Liang. It exists to make everyday unit conversions checkable: every factor is an international exact value, and every result shows its calculation steps.

The numbers

All unit factors come from international definitions — the pound is exactly 0.45359237 kg (NIST), the inch exactly 25.4 mm, the US gallon exactly 3.785411784 L. Currency rates are dated snapshots from the European Central Bank via frankfurter.app, and the page always shows its data date.

Contact

Questions or corrections: support@unitratio.com.

Nan Liang also writes at javaeye.dev.