Convert length, weight, temperature, area, volume, speed, time and data units instantly.
🔒 This tool runs entirely in your browser. Nothing you enter or upload is sent to our servers.
How to use the Unit Converter
- Pick a category (length, weight, temperature…).
- Type a value and choose the from/to units. Conversion is instant in both directions.
- Use the swap button to reverse the conversion.
About this tool
All conversions use exact international definitions where they exist (for example 1 inch = 25.4 mm and 1 pound = 0.45359237 kg exactly). Temperature uses the standard formulas: °F = °C × 9/5 + 32 and K = °C + 273.15.
Results show up to 8 significant digits; very large or small values switch to scientific notation.
Frequently asked questions
How many kilometres are in a mile?
1 mile = 1.609344 km exactly. So 10 miles is about 16.1 km, and 10 km is about 6.2 miles.
How do I convert kg to lbs?
Multiply kilograms by 2.20462. For example 70 kg ≈ 154.3 lb.
What’s the difference between US and imperial gallons?
A US gallon is 3.785 litres; an imperial (UK) gallon is 4.546 litres. This converter includes both.
Are the conversions exact?
Yes where an exact definition exists; results are rounded to a sensible number of digits for display.