Unit Converter
Convert units online free: cm to inches, kg to lbs, °C to °F, ml to oz, mph to km/h, MB to GB and more. Free online unit converter with exact factors.
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Part of the toolkit
How to use Unit Converter
- 1Pick a category: length, weight, temperature, volume, area, speed, time, data or energy
- 2Type a value and choose the From and To units — the result updates instantly
- 3Use ⇄ to swap units, Copy result to paste it, or open the table to see the value in every unit
Frequently asked questions
How many centimeters are in an inch?▾
Exactly 2.54 cm. To convert cm to inches divide by 2.54 (170 cm = 66.93 in, or 5 ft 6.93 in); to convert inches to cm multiply by 2.54.
How do I convert kg to lbs?▾
Multiply kilograms by 2.20462 (1 lb is exactly 0.45359237 kg). For example 70 kg = 154.32 lb.
How do I convert Celsius to Fahrenheit?▾
Multiply by 9/5 and add 32: 25 °C × 1.8 + 32 = 77 °F. To go back, subtract 32 and multiply by 5/9.
Are US and UK fluid ounces and gallons the same?▾
No. A US fluid ounce is 29.57 ml and a US gallon 3.785 L, while a UK (imperial) fluid ounce is 28.41 ml and a UK gallon 4.546 L. Both are available in the Volume category.
Is 1 GB 1000 MB or 1024 MB?▾
In SI units used by storage makers, 1 GB = 1000 MB. Operating systems often use binary units, where 1 GiB = 1024 MiB. The Data category includes both so you can compare.
How accurate are the conversions?▾
The converter uses the exact legal definitions (for example 1 ft = 0.3048 m, 1 US gallon = 3.785411784 L) and shows up to 10 significant digits.
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