Everyday converter
Length Converter
This length converter switches between feet, inches, meters, yards, miles, centimeters, and millimeters instantly in your browser. Every answer uses an exact factor, so only the figure on screen is rounded.
- Instant results
- Private & secureNo data is uploaded
- Works on all devices
Common length units
- Millimeter (mm)1 mm = 0.1 cm
- Centimeter (cm)1 cm = 10 mm
- Meter (m)1 m = 100 cm
- Kilometer (km)1 km = 1,000 m
- Inch (in)1 in = 2.54 cm exactly
- Foot (ft)1 ft = 12 in = 0.3048 m exactly
- Yard (yd)1 yd = 3 ft = 0.9144 m exactly
- Mile (mi)1 mi = 5,280 ft = 1.609344 km exactly
Conversion formula
Every conversion here uses an exact factor, not a rounded one.
Example: cm to inches
1 inch = 2.54 centimeters
So to convert centimeters to inches, divide by 2.54:
30 cm ÷ 2.54 = 11.811 in
The metric definitions of the inch, foot, yard, and mile have been exact since the 1959 international yard and pound agreement. Only the displayed answer is rounded.
Did you know?
One inch is exactly 2.54 centimeters — not approximately. The figure was fixed by agreement in 1959, which is why the same conversion gives the same answer wherever you do it.
It also means the mile is defined through the metre: 1 mile is exactly 1.609344 km, so a 5K is a shade over 3.1 miles.
Frequently asked questions
How many inches is 5 cm?
5 cm is 1.9685 inches. Divide centimeters by 2.54 to convert to inches. 1 inch is exactly 2.54 cm.
How many miles is 10 km?
10 km is 6.2137 miles. Divide kilometers by 1.609344 to convert to miles. 1 mile is exactly 1.609344 km.
How many meters is 1 foot?
1 foot is exactly 0.3048 meters. Multiply feet by 0.3048 for meters. 3 feet is 0.9144 meters.
How many yards is 100 meters?
100 meters is 109.361 yards. One yard is exactly 0.9144 meters. Divide meters by 0.9144 to get yards.
Is this length converter free with no sign-up?
Yes. This converter is free with no sign-up and no account. Use it as often as you need in your browser.
How many inches is 10 cm?
10 cm is 3.9370 inches. Divide centimeters by 2.54 to get inches. 5 cm is 1.9685 inches and 30 cm is 11.811 inches.
How many cm is 12 inches?
12 inches is exactly 30.48 cm. Multiply inches by 2.54 to get centimeters. That is one foot, and 36 inches is 91.44 cm.
Does this page convert inches to cm too?
Yes, both directions run on this page. Enter centimeters to read inches, or enter inches to read centimeters. The chart lists both columns.
Is 1 inch exactly 2.54 cm?
Yes. The international inch is defined as exactly 2.54 centimeters. Neither direction of this conversion is an approximation.
How many meters is 10 feet?
10 feet is 3.048 meters. Multiply feet by 0.3048 to get meters. 20 feet is 6.096 meters.
How many feet is 3 meters?
3 meters is 9.84 feet. Divide meters by 0.3048 to get feet. 10 meters is 32.81 feet.
Does this page convert meters to feet as well?
Yes, both directions run here. Enter feet to read meters, or enter meters to read feet. The chart covers both.
Is a foot exactly 0.3048 meters?
Yes. The international foot is defined as exactly 0.3048 meters, so neither direction of this conversion is an estimate.
How many km is 5 miles?
5 miles is 8.05 kilometers. Multiply miles by 1.609344 to get kilometers. 10 miles is 16.09 km.
How far is a marathon in km?
A marathon is 26.2 miles, which is 42.16 kilometers. A half marathon is 13.1 miles, or 21.08 km.
Does this page convert km to miles as well?
Yes, both directions run here. Enter miles to read kilometers, or enter kilometers to read miles. The chart lists both.
How many inches is 1 mm?
1 mm is 0.03937 inches. Divide millimeters by 25.4. 1 inch is exactly 25.4 mm.
How many inches is 25.4 mm?
25.4 mm is exactly 1 inch. That is the international definition. 12.7 mm is exactly 0.5 inches.
How many inches is 50 mm?
50 mm is 1.9685 inches. Divide by 25.4 for inches. 100 mm is 3.9370 inches.
How many mm is 1 inch?
1 inch is exactly 25.4 mm. Multiply inches by 25.4 for millimeters. 2 inches is 50.8 mm.
How many meters is 1 yard?
1 yard is exactly 0.9144 meters. Multiply yards by 0.9144. 10 yards is 9.144 meters.
How many meters is 100 yards?
100 yards is exactly 91.44 meters. Multiply by 0.9144. 50 yards is 45.72 meters.
How many meters is 50 yards?
50 yards is exactly 45.72 meters. Multiply yards by 0.9144 for meters. 120 yards is 109.728 meters.
How many yards is 1 meter?
1 meter is 1.09361 yards. Divide meters by 0.9144 for yards. 10 meters is 10.9361 yards.
How many feet is 12 inches?
12 inches is exactly 1 foot. Divide inches by 12 for feet. 24 inches is exactly 2 feet.
How many feet is 36 inches?
36 inches is exactly 3 feet. Divide by 12. 60 inches is exactly 5 feet.
How many feet is 18 inches?
18 inches is 1.5 feet. Divide inches by 12. 30 inches is 2.5 feet.
How many inches is 1 foot?
1 foot is exactly 12 inches. Multiply feet by 12 for inches. 6 feet is 72 inches.