Length Converter

A length converter turns a measurement in one unit into another, across both the metric and imperial systems, without you needing to memorize any factors. This free tool handles the units people use every day: millimeters, centimeters, meters, and kilometers on the metric side, and inches, feet, yards, and miles on the imperial side. Enter a value, choose the unit you have and the unit you want, and the result updates instantly. The conversions rest on exact, internationally agreed definitions rather than rough approximations. Since 1959 the inch has been defined as exactly 25.4 millimeters, which makes 1 inch equal to 2.54 centimeters and 1 foot equal to 0.3048 meters exactly. From those anchors everything else follows: a meter is about 3.28084 feet, a kilometer is about 0.621371 miles, and a mile is exactly 1609.344 meters. Because the underlying factors are exact, the only rounding happens when the result is displayed, so what you see matches official standards. Length conversion comes up constantly in real life. You might be reading a furniture listing in centimeters while thinking in feet and inches, following a recipe or workout plan written for another country, checking a technical spec sheet, or working on a construction or DIY project where the plans mix systems. Travelers convert road distances between kilometers and miles, and runners convert race distances the same way. Everything is calculated locally in your browser, so it is fast, private, and works offline once the page has loaded.