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Unit Converter

Convert length, weight, temperature, area, volume and data storage units instantly — results update live as you type.

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Quick answer

Online unit converter — convert length, weight, temperature, area, volume and file sizes instantly as you type: cm to inches, kg to pounds, GB to MB and more. Built for students, cooks, travelers and developers. Everything is plain math in your browser — no data involved, nothing sent anywhere.

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.

0.3937008

1 Centimeters (cm) = 0.3937008 Inches (in)

How to convert units

  1. Pick a category

    Choose length, weight, temperature, area, volume or file size.

  2. Enter the value and units

    Type the number and select the source and target units, such as cm to inches or GB to MB.

  3. Read the result

    The converted value updates live as you type, with no convert button needed.

Key features

Six categories

Length, weight, temperature, area, volume and digital file sizes.

Live conversion

Results update as you type — no convert button needed.

Everyday pairs covered

cm to inches, kg to pounds, Celsius to Fahrenheit, GB to MB and the rest.

Supported formats

  • Input: a numeric value and your chosen units
  • Output: the converted value, live, in the target unit

Privacy and security

The converter is pure JavaScript arithmetic in your browser. There is nothing to upload, nothing to store, and no data involved beyond the numbers you type.

Limitations

  • Conversions use standard defined factors; temperature conversions are formula-based (Celsius/Fahrenheit/Kelvin).
  • Displays a practical number of decimal places — not arbitrary-precision math.

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Frequently 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.