Converters
Length Converter
Convert mm, cm, m, km, inches, feet, yards, and miles instantly with exact SI factors.
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Version 1.0.0 · Last reviewed
Tool
Result
Live output from your inputs
Enter values and calculate to see results.
How it worksShow guideHide guide
Introduction
Convert between metric and imperial lengths — millimeters through miles — using exact SI conversion factors.
Formula
Convert length by normalizing to meters, then scaling to the target unit using fixed SI factors.
- v — Numeric length value
- f — Meters per unit for the selected unit
Step-by-step
- Enter the length value.
- Choose the unit you are converting from.
- Choose the unit you want.
- Read the converted result and the meter equivalent.
Worked example
1 mile equals exactly 1.609344 kilometers.
Use cases
- Translate floor plans between meters and feet
- Convert running distances from miles to kilometers
- Check product dimensions in inches and centimeters
Frequently asked questions
Are the factors exact?
Yes for the listed units. An inch is defined as exactly 0.0254 meters, so foot, yard, and mile follow from that.
Can I convert very small or large values?
Yes within a wide numeric range. Extremely tiny or huge numbers may round in the display.
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