Length Converter

Convert Length Online — Free Length Converter

Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles in one step. Type a number, pick your units, and see the answer — plus the same length in every other unit at a glance.

How to Convert Lengths

Enter a value, choose the unit you're converting from and the unit you want, and the result appears immediately in large type with the full equation underneath, such as 1 m = 3.2808 ft. Use the swap button to flip the two units around, and check the table below for the same length expressed in all eight units at once.

Handy Length Conversions

One inch is exactly 2.54 centimeters, one foot is exactly 0.3048 meters, one yard is exactly 0.9144 meters, and one mile is exactly 1,609.344 meters — the tool uses these exact international definitions. That makes everyday conversions easy to check: 5 feet 10 inches is 177.8 cm, a 10 km run is about 6.2 miles, and one meter is roughly 3.28 feet. Results are rounded to six decimal places, and large numbers are shown with thousands separators so they're easy to read.

Good Uses for This Tool

Converting your height or a room's dimensions between metric and imperial, checking furniture or appliance measurements against a floor plan, following a recipe or craft pattern written in different units, working out running and cycling distances, and doing homework or engineering calculations that mix systems.

Is It Actually Private?

Yes. The conversion is calculated instantly in your browser — the numbers you enter are never sent to a server or stored.