Unit Converter
Convert between any units instantly — length, weight, temperature, volume, area, speed, and more — with a full reference table of all conversions at once.
How to Use the Unit Converter
- Select the measurement category tab at the top.
- Enter your amount and select from and to units. Use the swap button to instantly reverse the conversion.
- The full conversion table shows your amount converted to every unit in the category simultaneously.
- Download the free PDF with the complete conversion reference table.
Example Conversions
- Length: 1 mile = 1.60934 km
- Weight: 1 kg = 2.20462 lbs
- Temperature: 100°C = 212°F
- Volume: 1 gallon = 3.78541 liters
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
Multiply Celsius by 9 divide by 5 then add 32. So 100°C becomes 100 times 9/5 plus 32 which equals 212°F. To go the other direction subtract 32 then multiply by 5/9. Common reference points are 0°C (32°F) freezing, 37°C (98.6°F) body temperature, and 100°C (212°F) boiling.
How many kilograms are in a pound?
One pound equals 0.453592 kilograms. Conversely one kilogram equals 2.20462 pounds. For a quick estimate multiply kilograms by 2.2 to get pounds. The pound is used in the United States UK and a few other countries while the kilogram is the international standard unit of mass.
What is the difference between a US gallon and an imperial gallon?
A US gallon equals 3.785 liters while an imperial (UK) gallon equals 4.546 liters — about 20% larger. This matters for fuel economy comparisons since miles per gallon figures differ between the two systems. This calculator uses US gallons.
How do I convert miles to kilometers?
Multiply miles by 1.60934. For a quick mental estimate multiply by 1.6 which is close enough for most purposes. Conversely divide kilometers by 1.60934 to get miles. Speed limits in the US and UK are in mph while most of the world uses km/h.
What is a nautical mile?
A nautical mile equals 1852 meters or about 1.15 statute miles. It is based on one minute of arc of latitude on the Earth's surface making it convenient for navigation. The knot is a unit of speed equal to one nautical mile per hour. These units are standard in maritime and aviation navigation worldwide.