Length Converter
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards and miles instantly — free and private.
Whether you are working on a construction plan, a school assignment or an international shipping label, this length converter gives you exact results in a fraction of a second. It covers both metric and imperial units with precise conversion factors, so you never have to guess. Type a value, pick your units and the answer updates live.
Factors use the exact international definitions (1 inch = 2.54 cm).
How to use the Length Converter
- Type the measurement you want to convert in the value box.
- Choose the starting unit in the From list and the target unit in the To list.
- The converted result appears instantly below — adjust any field to recalculate.
Length Converter — FAQs
How accurate is this length converter?
It uses exact international definitions: 1 inch equals 2.54 centimeters, 1 foot equals 0.3048 meters, and 1 mile equals 1,609.344 meters. Results are calculated with full floating-point precision and rounded only for display, so you can trust them for engineering, crafts and homework alike.
Can I convert feet and inches to metric units?
Yes. Select inch, foot, yard or mile as the From unit and a metric unit such as millimeter, centimeter, meter or kilometer as the To unit. The conversion happens instantly using the exact legal definitions of each imperial unit, so a 6-foot height becomes 1.8288 meters with no manual math.
Why does the result sometimes show many decimals?
The tool keeps up to eight significant digits so exact values are never rounded away by accident. For very large or very small results it switches to scientific notation automatically. This keeps the output precise whether you are measuring tiny millimeters or long miles.
Is my data uploaded anywhere?
Your data never leaves your device. This converter runs entirely in your browser using JavaScript, so nothing is uploaded, stored, shared or tracked. It works offline too, and you can use it as often as you like with complete confidence.