Length Converter
Convert a length or distance between meters, kilometers, centimeters, miles, feet and inches.
Centimeters
2.54 cm
1 in
Meters
0.0254 m
Kilometers
0.000025 km
Miles
0.000016 mi
Feet
0.08333 ft
Inches
1 in
Please note: The result is an estimate and has been rounded. Actual costs and values may differ, and no rights can be derived from this calculation.
How this number is calculated
The blocks use your input. Change a value above and they update with it.
Step 1 · Meters
Step 2 · Kilometers
Step 3 · Centimeters
Step 4 · Miles
Step 5 · Feet
Step 6 · Inches
How the calculation works
Enter a length, choose its unit and see it straight away in meters, kilometers, centimeters, miles, feet and inches. Useful for a screen size in inches, a distance in miles or a height in feet.
Your input is first converted to meters using the exact international definitions: 1 inch is 2.54 cm, 1 foot is 12 inches (0.3048 m) and 1 mile is 1,609.344 m. The length in meters is then divided by the number of meters per unit. These are the same numbers the site's calculation engine uses to convert units.
Rounding happens only at the end, with halves rounded away from zero: kilometers and miles to 6 decimal places, feet to 5, meters and inches to 4 and centimeters to 2. Every result is therefore accurate to better than a millimeter, and well-known values come out exactly, such as 1 inch = 2.54 cm and 1 mile = 1.609344 km. A very small length in a large unit can become 0 through rounding: less than half a millimeter is 0 in kilometers. Trailing zeros are left out.
Formula
Length in a unit = length in meters ÷ meters per unit. Meters per unit: kilometer 1,000, centimeter 0.01, mile 1,609.344, foot 0.3048, inch 0.0254.
Assumptions
- 1 inch is exactly 2.54 cm and 1 foot is 12 inches, exactly 30.48 cm. These are the international definitions from 1959.
- A mile is the ordinary statute mile of exactly 1,609.344 m, not a nautical mile of 1,852 m.
- Inches, feet and miles are the same length in the US and the UK.
- Rounding happens only at the end: km and miles to 6 decimal places, feet to 5, meters and inches to 4, cm to 2.
Example calculations
The button fills in the calculator above, so you can carry on from there.
-
55-inch TV
Centimeters
139.7 cm
Length 55 in
Measured diagonally, from corner to corner.
-
Height of 6 feet
Centimeters
182.88 cm
Length 6 ft
-
Jeans size W32
Centimeters
81.28 cm
Length 32 in
The W size is the waist measurement in inches.
Frequently asked questions
How many cm are in an inch?
One inch is exactly 2.54 cm, as agreed internationally in 1959. So 10 inches is 25.4 cm, and 1 cm is about 0.39 inches.
How many cm are in a foot?
One foot (ft) is exactly 30.48 cm, and a foot has 12 inches. So 6 feet is 182.88 cm.
How do I convert feet and inches to cm?
Multiply the feet by 12, add the inches and multiply the total by 2.54. Someone who is 5 feet 10 inches tall, written 5′10″, is 70 inches, which is 177.8 cm.
How big is a 55-inch TV in cm?
The 55 inches is the screen diagonal, from corner to corner: 139.7 cm. On a standard widescreen (16:9) TV the picture is about 122 cm wide and 68 cm high; the TV itself is slightly larger.
How many kilometers are in a mile?
One mile is exactly 1.609344 km, and 1 km is about 0.621 miles. So 60 miles per hour is almost 97 km per hour. A nautical mile is different: it is 1,852 meters.
How many miles is a marathon?
A marathon is 42.195 km, about 26.2 miles. A half marathon is 21.0975 km, about 13.1 miles.
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