Tool
Length Converter
Convert between mm, cm, m, km, inches, feet, yards and miles. Live reference table for all units.
Convert lengths in three steps
Works in any browser, on any device. No install required.
Enter a length value
Type any number into the input field.
Select the unit
Choose the source unit (meters, feet, inches, cm, etc.).
See all conversions
Every common length unit updates simultaneously.
Length units
All major units
Millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
All values update live
Change the input and all units refresh instantly.
Imperial and metric
Convert freely between the two systems.
About the Length Converter
Length measurement varies between countries and contexts. The metric system (mm, cm, m, km) is used by most of the world, while the imperial system (inches, feet, yards, miles) is still common in the US and informally in the UK. This converter handles all common length units with live results and a full reference table showing every conversion simultaneously.
Common uses: converting height between cm and feet/inches, converting distances between km and miles, engineering measurements, fabric and clothing sizes, and screen dimensions.
The most searched conversions are centimetres to inches (for screen sizes and clothing), kilometres to miles (for distances and road signs abroad), metres to feet (for height and property dimensions), and millimetres to inches (for engineering and woodworking). A quick reference: 1 inch = 2.54 cm, 1 foot = 30.48 cm, 1 mile = 1.609 km, 1 metre = 3.281 feet.
Height conversion comes up often — 180 cm is 5 ft 11 in, 170 cm is 5 ft 7 in, 160 cm is 5 ft 3 in. Screen sizes are always quoted diagonally in inches, so a 27-inch monitor is 68.6 cm corner to corner. The reference table shows every unit simultaneously for the value you enter.
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Frequently Asked Questions
How many centimeters are in an inch?
1 inch = 2.54 centimeters exactly. This is the official international definition since 1959.
How do I convert feet to meters?
1 foot = 0.3048 meters. To convert: multiply feet by 0.3048. For a rough mental estimate, divide feet by 3.28.
What's the difference between a nautical mile and a regular mile?
A statute mile (land mile) is 1,609.34 meters. A nautical mile is 1,852 meters — it's based on one minute of arc of latitude and is used in aviation and navigation.
What units does the US use vs the rest of the world?
The US primarily uses the imperial system: inches, feet, yards, miles, Fahrenheit, pounds, and gallons. Most of the world uses the metric system (SI units): centimeters, meters, kilometers, Celsius, kilograms, and liters.