Length Converter Calculator
Enter a length in any unit to see it instantly converted into eight common metric and imperial length units.
Length Converter Calculator
Converts a length between millimeters, centimeters, meters, kilometers, inches, feet, yards and miles all at once.
This calculator converts a single length value into eight of the most commonly used metric and imperial units at once — millimeters, centimeters, meters, kilometers, inches, feet, yards and miles — so you can see every common equivalent side by side instead of running separate conversions. Enter your value in whatever unit is most convenient using the field's own unit selector, and every result updates together using exact standard conversion factors.
Example
- With the default values shown above, this calculator returns: Millimeters ≈ 1000 mm; Centimeters ≈ 100 cm; Meters ≈ 1 m; Kilometers ≈ 0.001 km; Inches ≈ 39.37 in; Feet ≈ 3.281 ft; Yards ≈ 1.094 yd; Miles ≈ 0.000621 mi.
Frequently Asked Questions
How do I change the input unit?
Use the unit selector on the Length field itself — enter your value in whichever unit you have, and every result below updates automatically.
How accurate are the conversions?
They use exact, standard conversion factors (e.g. 1 inch = 0.0254 meters exactly), so results are precise to the number of decimal places shown.
Sources
- Standard formula, publicly documented method