Unit Converter
Convert between any units instantly. Length, weight, temperature, volume, area, and speed — all in one tool.
Unit Converter
Free Online Unit Converter — All Categories
This free unit converter handles the most common conversion categories in one place. Whether you need to convert kilometres to miles for a road trip, kilograms to pounds for a recipe, Celsius to Fahrenheit for a weather app, or litres to gallons for a fuel calculation — enter your value and get the answer instantly.
Most Common Conversions
Length: 1 mile = 1.60934 km · 1 foot = 30.48 cm · 1 inch = 2.54 cm. Weight: 1 kg = 2.20462 lbs · 1 stone = 6.35029 kg. Temperature: °F = (°C × 9/5) + 32 · °C = (°F − 32) × 5/9. Volume: 1 US gallon = 3.78541 litres · 1 cup = 236.588 ml.
Why Unit Conversion Still Matters
The US remains one of the few countries not fully using the metric system, making conversions a daily necessity for travel, cooking, science, and fitness. Understanding unit relationships — rather than just plugging numbers in — helps you develop intuition for quantities across systems.