How it works
- Length, weight and volume are converted through a base unit (meter, kilogram, liter) using exact international definitions, e.g. 1 inch = 2.54 cm and 1 lb = 0.45359237 kg.
- Temperature uses formulas: °F = °C × 9/5 + 32 and K = °C + 273.15.
- Volume units such as cups and gallons use US customary measures.
Frequently asked questions
Are US and UK gallons the same?
No. A US gallon is 3.785 L and an imperial (UK) gallon is 4.546 L. This converter uses US gallons.
How precise are the results?
Conversion factors are exact definitions; results are shown to up to 6 significant decimals.
Results are estimates for general information and are not financial, medical or professional advice.