Unit Converter
A general converter covering multiple unit groups.
Length, weight and temperature.
The converters share a common interface, but each uses different units and data.
A general converter covering multiple unit groups.
Specialized conversion for length and distance units.
Open calculatorSpecialized conversion for weight and mass units.
Open calculatorCurrency conversion using the available exchange rates.
Open calculatorRecipes in cups, packages in pounds, forecasts in Fahrenheit — the metric and imperial worlds refuse to merge, so conversion remains a daily need. This converter covers the pairs people actually reach for: length, weight, distance, temperature, and volume.
Pick the conversion direction and enter your value. Length, weight, distance, and volume use fixed multiplicative factors; temperature is the special case, needing both scaling and an offset.
All factors are exact or standard definitions; the inch has been defined as exactly 2.54 cm since 1959. Volume uses the US gallon (3.785 L), not the imperial gallon (4.546 L).
100 cm → 100 ÷ 2.54 = 39.37 inches. And a pleasant 25 °C day is 25 × 9/5 + 32 = 77 °F.
Because the scales have different zero points: 0 °C sits at 32 °F. Conversions therefore need the offset — and only −40° reads the same on both scales.
The US gallon (3.785 liters). The imperial gallon used historically in the UK is about 20% larger (4.546 L) — a frequent source of fuel-economy confusion.
A kilogram is about 2.2 pounds, a mile about 1.6 km, an inch about 2.5 cm, and for temperature: double the °C and add 30 gets you within a couple of °F for everyday weather.
These sources are used to verify terminology, formulas, and information related to this calculator.