How to use
- Select a category: Length, Weight, or Temperature.
- Enter a value in any unit field.
- All other units in that category update instantly.
About this tool
The UK occupies an unusual position in the world of measurement: officially metric since 1965, yet still firmly bilingual in practice. Road distances and speed limits are in miles; most scientific and medical measurements use metric. Weight is officially in kilograms, but most people still think in stones and pounds for body weight. Temperature forecasts are given in Celsius, but older generations often default to Fahrenheit. This converter handles the most common conversions across three categories: length (millimetres through miles), weight (grams through stone and pounds), and temperature (Celsius, Fahrenheit, and Kelvin). Type any value and all related units update at once — no need to convert one at a time.