Length Converter
Inches, cm, feet, meters, miles, yards and nautical miles
About this tool
This free length converter supports the most common metric and imperial length units: inches, feet, yards, miles, millimeters, centimeters, meters, kilometers, and nautical miles. Enter any value and every other unit updates instantly. It is the quickest way to convert your height, a room measurement, a running distance, or a map scale.
Key conversion facts: 1 inch = 2.54 cm (exact, by international agreement since 1959). 1 foot = 12 inches = 30.48 cm. 1 yard = 3 feet = 0.9144 meters. 1 mile = 5,280 feet = 1,609.344 meters. 1 kilometer = 1,000 meters ≈ 0.621 miles. 1 nautical mile = 1,852 meters, used in aviation and maritime navigation where it equals one arc-minute of latitude.
Common everyday uses: US residents often want to know their height in centimeters for international forms (5 ft 10 in = 177.8 cm). Runners converting between kilometers and miles for international races (a 5K is 3.107 miles; a marathon is 26.219 miles). DIYers converting a lumber measurement from inches to millimeters for a metric drill bit. Real estate listings comparing square footage to square meters for international buyers.
The US, Liberia, and Myanmar are the only countries still officially using the imperial system. Everyone else uses metric (SI units). When working with international colleagues or suppliers, always clarify which system you are using — a miscommunication between feet and meters is a significant difference.