Length Converter
Convert cm to inches, meters to feet, kilometers to miles and every other length unit instantly.
This length converter turns any distance measurement into another unit the moment you type. It is built for the everyday searches people actually make — cm to inches for a screen size, meters to feet for a room, or kilometers to miles for a run — and covers metric, imperial and nautical units in one place.
About the length converter
Length (or distance) measures how far apart two points are. The world uses two main systems: the metric system, built on the metre and its decimal multiples (millimetre, centimetre, kilometre), and the imperial/US customary system, built on the inch, foot, yard and mile. Because most countries use metric while the United States still relies on feet and inches, converting between the two is one of the most common measurement tasks online.
Every conversion here is anchored to the metre, the SI base unit of length. One inch is defined as exactly 0.0254 metres, one foot as 0.3048 metres and one mile as 1,609.344 metres, so the results you see are exact by definition rather than rounded approximations. Enter a value once and this tool shows it in all supported units at the same time, which is handy when you are comparing specifications or filling in a form that expects a different unit.
How to use this length converter
- Type the distance you want to convert into the value box.
- Pick the unit you are converting from (for example, centimetres).
- Pick the unit you want the answer in (for example, inches).
- Read the converted result instantly — no button to press.
- Use the swap arrows to reverse the direction, or scan the "all units" grid to see every unit at once.
Length conversion factors
Exact reference factors used by this converter:
Supported length units
- kmKilometre
- mMetre
- cmCentimetre
- mmMillimetre
- µmMicrometre
- miMile
- ydYard
- ftFoot
- inInch
- nmiNautical mile
Frequently asked questions
How do I convert cm to inches?
Divide the number of centimetres by 2.54, because one inch equals exactly 2.54 cm. For example, 30 cm ÷ 2.54 = 11.81 inches. The converter does this automatically as you type.
How many feet are in a meter?
One metre equals about 3.28084 feet. To convert metres to feet, multiply by 3.28084; to go from feet to metres, multiply by 0.3048.
How do I convert km to miles?
Multiply kilometres by 0.621371 to get miles. So 5 km ≈ 3.11 miles. To reverse it, multiply miles by 1.609344.
Is the inch exactly 2.54 cm?
Yes. Since 1959 the international inch has been defined as exactly 0.0254 metres (2.54 cm), so conversions between inches and centimetres are exact rather than approximate.
What is a nautical mile and how is it different?
A nautical mile is used in aviation and marine navigation and equals exactly 1,852 metres — about 1.151 statute (land) miles. It was originally based on one minute of latitude.