Unit Converter
Convert between common units of length, weight, temperature, and volume instantly.
Updated April 2026 · CalcFlow Editorial
Enter values above and click Calculate to see your results.
What is a Unit Converter? A unit converter is a tool that converts a measurement value from one unit of measure to another using a fixed conversion factor or formula.
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Rule of Thumb
1 mile = 1.609 km | 1 kg = 2.205 lb | 0°C = 32°F (freezing) | 100°C = 212°F (boiling) | 1 gallon = 3.785 liters | 1 inch = 2.54 cm.
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Example Calculation
A 6-foot person is 6 x 0.3048 = 1.83 meters tall. A 180-pound person weighs 180 x 0.4536 = 81.6 kilograms.
Key Facts
- •The US uses the Imperial system (miles, pounds, Fahrenheit) while most of the world uses metric (km, kg, Celsius).
- •Temperature conversions are non-linear — you cannot simply multiply; Fahrenheit uses an offset (+32) as well as a scale factor.
- •US liquid measurements (cups, quarts, gallons) differ slightly from UK Imperial equivalents.
How to Use
- Select the category (Length, Weight, Temperature, or Volume).
- Select the unit you are converting FROM.
- Select the unit you are converting TO.
- Enter the value you want to convert.
- Click Calculate to see the converted result.
Formula
Length: 1 ft = 0.3048 m | Weight: 1 lb = 0.4536 kg | Temp: F = (C x 9/5) + 32 | Volume: 1 gal = 3.785 L| Conversion | Exact Factor | Common Shorthand |
|---|---|---|
| 1 meter | 3.28084 feet | roughly 3.3 feet |
| 1 kilometer | 0.621371 miles | roughly 0.6 miles |
| 1 kilogram | 2.20462 pounds | roughly 2.2 lbs |
| 1 inch | 2.54 centimeters | exactly 2.54 cm |
| 1 liter | 0.264172 gallons | roughly 0.26 US gal |
| 0°C (Celsius) | 32°F (Fahrenheit) | freezing point of water |
| 100°C (Celsius) | 212°F (Fahrenheit) | boiling point of water |
| 1 US gallon | 3.78541 liters | roughly 3.8 liters |