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Unit Converter

Length, weight, temperature, volume, area, speed — cm to inches, kg to lbs, °F to °C, both ways at once.

1 cm = 0.3937007874 in
All conversions →
About, how to use & limitations

About Unit Converter

Unit Converter handles everyday metric and imperial conversions for length, weight, temperature, volume, area, and speed. Convert cm to inches, kg to lbs, °F to °C, liters to gallons, square feet to square meters, or mph to km/h, typing in either box while the other updates instantly. Shortcut buttons set up the most searched pairs, and a swap button reverses the units. Conversion factors use exact international definitions (1 inch = 2.54 cm, 1 lb = 0.45359237 kg), cups, pints, and gallons are US customary units, and results show up to 10 significant digits.

How to use

  1. Pick a category: Length, Weight, Temp, Volume, Area, or Speed, or tap a shortcut like cm → in.
  2. Select the From and To units from the dropdowns.
  3. Type a number in either box (it starts at 1); the other side converts instantly.
  4. Click the swap button between the boxes to flip the units.
  5. Read the summary line below and click Copy to copy it.

Limitations & notes

  • Only length, weight, temperature, volume, area, and speed are supported.
  • Cups, pints, quarts, gallons, and fluid ounces are US customary units, not UK imperial, and the ton option is the metric ton.
  • Results are rounded to 10 significant digits.
  • Swap flips the two units but keeps the typed number on the left, so the result changes instead of mirroring the previous conversion.

FAQ

How do I convert kg to lbs?
Multiply kilograms by 2.20462, since 1 kg is about 2.20462 lb. For example, 70 kg is about 154.3 lb; to go from pounds to kilograms, multiply by 0.453592.
How do I convert Fahrenheit to Celsius?
Subtract 32 and multiply by 5/9: °C = (°F - 32) × 5/9. So 98.6 °F is 37 °C and 32 °F is 0 °C; the reverse formula is °F = °C × 9/5 + 32.
How many centimeters are in an inch?
One inch is exactly 2.54 cm, so divide centimeters by 2.54 to get inches. For example, 180 cm is about 70.87 inches, or roughly 5 ft 10.9 in.
Are the gallons US or imperial?
Volume units are US customary: 1 US gallon is 3.785 liters and 1 US cup is about 236.6 ml. The UK imperial gallon (4.546 liters) is not included.