Unit Converter
Convert between metric and imperial units across length, weight, temperature, volume and speed.
About the unit converter
A fast, accurate unit converter for length, weight, temperature, volume and speed. Convert between metric and imperial units — centimetres to inches, kilograms to pounds, Celsius to Fahrenheit, litres to gallons, km/h to mph and dozens more — with results that update as you type.
- Length, weight, temperature, volume and speed in one place
- Metric ⇄ imperial: cm/inch, kg/lb, °C/°F, litre/gallon, km/h / mph
- Live conversion as you type with a one-tap swap button
- High-precision results with sensible rounding
- Works offline once loaded — nothing is sent to a server
How do I convert between metric and imperial units?+
Choose a category (length, weight, temperature, volume or speed), pick the 'from' and 'to' units, and type a value. The converted result appears instantly, and you can swap the two units with a single click.
Is the unit converter accurate?+
Yes. Conversions use exact factors (for example 1 inch = 2.54 cm) and display high-precision results, so it's reliable for cooking, travel, engineering and schoolwork.
Which units are supported?+
Length (mm to miles), weight (mg to stone), temperature (Celsius, Fahrenheit, Kelvin), volume (millilitres to gallons, US and UK) and speed (m/s, km/h, mph, knots and more).