About Unit Conversions
Unit conversion is the process of converting a given quantity from one unit to an equivalent quantity in another unit. Our unit converter supports the most common measurement categories used in everyday life, science, and engineering.
Metric vs. Imperial System
The world uses two major measurement systems. The metric system (SI) is used by most countries and is based on powers of 10, making conversions straightforward. The imperial system is primarily used in the United States and uses historical units like miles, pounds, and Fahrenheit.
Common Conversion Reference
| Category | Common Conversions |
|---|---|
| Length | 1 inch = 2.54 cm; 1 mile = 1.609 km; 1 foot = 30.48 cm |
| Weight | 1 lb = 0.4536 kg; 1 oz = 28.35 g; 1 stone = 6.35 kg |
| Temperature | °F = (°C × 9/5) + 32; K = °C + 273.15 |
| Volume | 1 liter = 1.0567 US qt; 1 gallon = 3.785 liters |
| Speed | 1 mph = 1.609 km/h; 1 knot = 1.852 km/h |