How to use this unit converter
- Select a category (length, weight, temperature, volume, area, speed, or data)
- Enter the value you want to convert
- Choose the from unit and the to unit
- Click Convert to see the result
Common conversions — quick reference
- 1 inch = 2.54 cm | 1 foot = 30.48 cm | 1 mile = 1.609 km
- 1 kg = 2.205 lb | 1 stone = 6.35 kg | 1 oz = 28.35 g
- °F to °C: subtract 32, then multiply by 5/9
- 1 US gallon = 3.785 liters | 1 UK gallon = 4.546 liters
- 1 GB = 1,024 MB = 1,073,741,824 bytes
Why unit conversions matter
Unit conversions are needed everywhere — cooking recipes in different measurement systems, international travel (km vs miles, Celsius vs Fahrenheit), buying fabric or flooring (cm vs inches), or understanding product specifications. Having an instant converter removes the need to memorize formulas or look up conversion factors.
Frequently asked questions
How do I convert cm to inches?
Multiply centimeters by 0.3937 to get inches. For example, 100 cm = 39.37 inches. Or divide by 2.54 (since 1 inch = 2.54 cm exactly).
How do I convert kg to pounds?
Multiply kilograms by 2.20462 to get pounds. For example, 70 kg = 154.32 lbs. To convert pounds to kg, divide by 2.20462.
How do I convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5 (or 1.8) then add 32. Formula: F = (C × 9/5) + 32. For example, 100°C = 212°F (boiling point of water).
How do I convert miles to kilometers?
Multiply miles by 1.60934 to get kilometers. For example, 10 miles = 16.09 km. To convert km to miles, multiply by 0.62137.