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Unit Converter

Convert between 124 units across 16 categories — length, weight, temperature, area, volume, speed, pressure, energy, power, time, frequency, angle, force, torque, fuel economy and data. Results appear as you type. Everything runs in your browser; nothing is uploaded.

Months and years appear under Time as averages over the Gregorian calendar, which is what a duration needs. For real calendar dates — “what is 30 days after 4 September?” — use the Time & Date Calculator, where a month is a real month.

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How to Use the Unit Converter

  1. Pick the kind of measurement you are converting.
  2. Choose the unit you have and the unit you want.
  3. Type your value and read the converted result.

What You Can Do

Frequently Asked Questions

How do I convert centimetres to inches?

Choose length, set the first unit to centimetres and the second to inches, then type your value.

Why is temperature converted differently from length?

Temperature scales do not share a zero point, so Celsius and Fahrenheit need an offset as well as a multiplier.

Is a US gallon the same as an imperial gallon?

No. An imperial gallon is about a fifth larger, which is why recipes and fuel figures do not carry across unchanged.

How precise are the conversions?

Conversions use standard definitions and are rounded only for display, so the figure you see matches the figure used.