Unit Converter

Select a category using the tabs at the top, choose your "from" and "to" units from the dropdowns, then type your value. The result updates instantly as you type. Use the swap button to reverse the conversion.

Eight categories: length (metres, feet, inches, miles, km, yards, nautical miles…), weight (kg, lb, oz, grams, stones, tonnes…), temperature (Celsius, Fahrenheit, Kelvin), speed (km/h, mph, m/s, knots, Mach), volume (litres, gallons, ml, pints, cups…), area (m², km², acres, hectares, sq ft…), time (seconds through decades) and digital data (bits through petabytes).

All conversions use internationally standardised conversion factors. Results are displayed to up to 8 significant figures, which is accurate enough for virtually all practical applications.

Select the Temp tab, set "From" to Celsius and "To" to Fahrenheit, then enter your value. The formula is °F = (°C × 9/5) + 32. For example, 100°C = 212°F (water boiling point).

Select the Length tab, set "From" to Mile and "To" to Kilometre, then enter your value. 1 mile = 1.60934 kilometres. So 10 miles ≈ 16.09 km. Or click the "1 Mile = 1.609 Kilometre" quick conversion button.

Yes, completely free. No account, no limits, no ads in the way. All tools on PlanetMaks are free to use for everyone.