Length Converter
Convert lengths between millimetres, centimetres, metres, kilometres, inches, feet, yards, and miles. Type in any field, all others update instantly.
What is Length Converter?
Length conversion is one of the most common unit conversion tasks, arising in construction, manufacturing, travel, science, and everyday life. The metric system uses millimetres, centimetres, metres, and kilometres. The imperial and US customary systems use inches, feet, yards, and miles. Many professional contexts require fluency in both systems — construction drawings in the US use feet and inches, while engineering specifications often use metric.
Common conversion scenarios include converting a recipe dimension from inches to centimetres, understanding road distances in miles when used to kilometres, converting screen resolution specifications, and working with international building plans. Knowing that 1 inch = 2.54 cm and 1 mile ≈ 1.609 km covers most everyday needs.
Enter a value in any unit field and all other units update instantly. All calculations run locally in your browser with no data sent anywhere.
How to use
Frequently asked questions
Exactly 2.54 centimetres. This is the defined conversion factor — 1 inch = 2.54 cm exactly.
Approximately 1.60934 kilometres. Conversely, 1 kilometre ≈ 0.62137 miles.
A metre is slightly longer: 1 metre = 1.09361 yards, or 1 yard = 0.9144 metres.
Yes. All conversions run in your browser. Nothing is sent to any server.