Unit Converter
Convert between metric and imperial units in one place — length, weight, temperature and volume. Pick a category, type a value in any field, and every other unit updates at once. Runs in your browser; no signup.
Type in any field — the rest convert instantly. Values round to 6 significant digits.
Quick reference
- 1 inch = 2.54 cm · 1 foot = 30.48 cm · 1 mile = 1.609 km
- 1 kg = 2.20462 lb · 1 ounce = 28.3495 g
- °F = °C × 9/5 + 32 · °C = (°F − 32) × 5/9
- 1 US gallon = 3.78541 litres · 1 cup = 236.588 ml
FAQ
What units can I convert?
Length (mm, cm, m, km, inch, foot, yard, mile), weight (mg, g, kg, tonne, ounce, pound, stone), temperature (Celsius, Fahrenheit, Kelvin) and volume (ml, litre, US teaspoon/tablespoon/cup/pint/quart/gallon). Pick a category tab and type in any field.
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32: °F = °C × 9/5 + 32. So 20°C is 68°F. The temperature tab does this instantly and also handles Kelvin.
Is this metric to imperial too?
Yes, both directions at once. Type a value in any unit and every other unit in that category updates immediately, whether metric or imperial.
How accurate are the conversions?
They use exact conversion constants (for example 1 inch = 2.54 cm, 1 pound = 453.59237 g) and round results to 6 significant figures for readability.
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