Length Converter
Formula
Try other calculators
Celsius, Fahrenheit, Kelvin and more.
Kg, pounds, ounces and more.
km/h, mph, knots and more.
How the length converter works
Type a length, choose from and to units — metric, imperial and nautical — and see the answer instantly plus a full table of your value in all nine units. The swap button flips direction in one tap.
Conversions to remember
1 inch = 2.54 cm exactly, 1 mile = 1.609 km, 1 foot = 30.48 cm. A nautical mile (1,852 m) is the aviation and shipping standard — one minute of latitude.
Frequently asked questions
How many cm in an inch?
Exactly 2.54 cm — defined internationally in 1959. So 10 inches is 25.4 cm, no rounding involved.
What's the difference between a mile and a nautical mile?
A statute mile is 1,609 m (road distances); a nautical mile is 1,852 m (one minute of latitude, used at sea and in the air).
Why does the US still use feet and inches?
Historical inertia — though US science, medicine and the military run metric. Our converter handles both systems instantly.
How do I read 5'10" in cm?
5 feet 10 inches = 70 inches × 2.54 = 177.8 cm. Enter 70, from inches to cm, above.