Unit Converter
Convert between common units of measurement.
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Frequently Asked Questions
How do I convert between metric and imperial?
Use the converter above. Common ones: 1 inch = 2.54 cm, 1 mile = 1.609 km, 1 lb = 0.454 kg, 1 gallon = 3.785 liters.
How do I convert Celsius to Fahrenheit?
F = C × 9/5 + 32. Example: 20°C = 68°F. Quick estimate: double and add 30.
What is the metric system?
A decimal measurement system used by most countries. Based on meters (length), grams (weight), and liters (volume) with prefixes like kilo- (1000) and milli- (1/1000).
Why does the US use different units?
The US customary system evolved from English units. Despite official adoption of metric in 1975, everyday use of customary units persists.
What is a stone (weight)?
A stone is 14 pounds, commonly used in the UK and Ireland for body weight.