Free Length & Distance Converter
The Length Converter switches between metric and imperial distance units — millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles. Enter a value and the result updates instantly.
Measuring for the web instead? The Px to Rem Converter works in CSS units, while Area and Weight cover the other everyday measurements.
How to use the Length Converter
- 1 Enter the value you want to convert.
- 2 Pick the unit you are converting from and the unit you want.
- 3 The converted value appears immediately, along with a full table of the same length in every other unit.
- 4 Copy the result, or read straight from the table if you need several units at once.
How to Use
Type a value, choose the unit you are converting from and the unit you want, and the result appears live. The full conversion table shows every unit at once.
- Metric and imperial units
- Live result as you type
- Full conversion table
Frequently asked questions
Is an inch exactly 2.54 cm?
Yes — since the 1959 international yard and pound agreement, one inch is defined as exactly 2.54 centimetres. All imperial-to-metric length conversions here are exact by definition, not approximations.
What is the difference between a US and an imperial gallon?
They are different volumes — that affects volume conversions, not length. For length the trap is the nautical mile (1,852 m, used at sea) versus the statute mile (1,609.344 m, used on land).
Why does the result sometimes show many decimal places?
The conversion is exact and the display is not rounded to hide that. Copy the full precision value if you need it, or round it yourself to the number of significant figures your work requires.
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