Unit Converter
Convert length, weight, temperature, area, volume and data storage units instantly — results update live as you type.
A fast, free measurement converter for the conversions people actually search for — cm to inches, kg to pounds, miles to km, Celsius to Fahrenheit, GB to MB and more. Type a value and the answer appears instantly; nothing is sent anywhere.
1 Centimeters (cm) = 0.3937008 Inches (in)
AdFrequently Asked Questions
Is this unit converter free to use?
Yes — completely free, no sign-up and no limits. All conversions run locally in your browser, so it even works offline once the page has loaded.
Is data storage based on 1000 or 1024?
This tool uses the binary convention that matches how operating systems report file sizes: 1 KB = 1024 bytes, 1 MB = 1024 KB, 1 GB = 1024 MB, 1 TB = 1024 GB. (Drive manufacturers often use the decimal 1000-based convention, which is why a '1 TB' drive shows less capacity in Windows.)
How accurate are the conversions?
Exact international definitions are used wherever they exist — for example 1 inch = 25.4 mm exactly, 1 pound = 0.45359237 kg exactly and 1 US gallon = 3.785411784 liters. Results are rounded to a sensible number of digits for display.
Which gallon and cup are used?
US customary units: 1 gallon = 3.785 liters and 1 cup = 236.6 ml (the US legal cup used in nutrition labeling). UK/imperial gallons are about 20% larger.
How does the temperature conversion work?
Temperature uses offset formulas rather than simple multiplication: °F = °C × 9/5 + 32, and K = °C + 273.15. Enter a value in any of Celsius, Fahrenheit or Kelvin and the others are defined exactly.