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Length conversion table:
For a quick and easy way to explore the conversion factors between commonly used length units.
| Unit | millimeter (mm) | centimeter (cm) | meter (m) | kilometer (km) | inch (in) | feet (ft) | yard (yd) | mile (mi) |
|---|---|---|---|---|---|---|---|---|
| 1 mm | 1 | 0.1 | 0.001 | 0.000001 | 0.039370 | 0.0032808 | 0.0010936 | 0.00000062137 |
| 1 cm | 10 | 1 | 0.01 | 0.00001 | 0.39370 | 0.032808 | 0.010936 | 0.0000062137 |
| 1 m | 1,000 | 100 | 1 | 0.001 | 39.3701 | 3.2808 | 1.0936 | 0.00062137 |
| 1 km | 1,000,000 | 100,000 | 1,000 | 1 | 39,370.0787 | 3,280.8399 | 1,093.6133 | 0.62137 |
| 1 in | 25.4 | 2.54 | 0.0254 | 0.0000254 | 1 | 0.083333 | 0.027777 | 0.000015782 |
| 1 ft | 304.8 | 30.48 | 0.3048 | 0.0003048 | 12 | 1 | 0.33333 | 0.00018939 |
| 1 yd | 914.4 | 91.44 | 0.9144 | 0.0009144 | 36 | 3 | 1 | 0.00056818 |
| 1 mi | 1,609,344 | 160,934.4 | 1,609.344 | 1.6093 | 63,360 | 5,280 | 1,760 | 1 |
Definitions
A millimeter is a unit of length in the metric system, equal to one thousandth of a meter. It's commonly used for small objects like jewelry or electronic components.
A centimeter is a metric unit of length, equal to one hundredth of a meter. It's often used in everyday measurements, such as for the dimensions of furniture or personal height.
The meter is the base unit of length in the International System of Units (SI). It is defined as the distance traveled by light in a vacuum in 1/299,792,458 seconds. Meters are commonly used for measuring room dimensions or distances in sports.
A kilometer is a metric unit of length equal to 1,000 meters. It's typically used to measure long distances, like the length of a road or the distance between cities.
An inch is a unit of length in the Imperial and United States customary systems. One inch is equal to 25.4 millimeters. It's often used in the United States for measuring screen sizes, body measurements, and small-scale distances.
A foot is a unit of length in the Imperial system and U.S. customary units. One foot equals 12 inches or 0.3048 meters. It's commonly used in the United States for measuring height, short distances, and real estate dimensions.
A yard is an Imperial unit of length equal to 3 feet or 36 inches. In the metric system, one yard is approximately 0.9144 meters. It's often used for measuring fabric lengths and distances in sports fields like American football or golf.
A mile is a unit of length in the Imperial system and U.S. customary units, equal to 5,280 feet or about 1.609 kilometers. Miles are commonly used for long-distance measurements, such as in road signage and for measuring the distance between locations.
A nautical mile is a unit of measurement used in maritime and air navigation. One nautical mile is approximately 1.852 kilometers or 1.1508 miles. It's based on the circumference of the Earth and is used to denote distances at sea or in the air.
A light-year is a unit of distance used in astronomy, representing the distance that light travels in one year in a vacuum. One light-year is about 9.461 trillion kilometers or about 5.879 trillion miles. It's used to measure astronomical distances between stars and galaxies.
An astronomical unit is approximately equal to the mean distance between the Earth and the Sun. More precisely, it's defined as 149,597,870.7 kilometers (or about 92,955,807 miles). This unit is particularly useful when discussing distances of planets and other celestial bodies within our solar system. For example, the Earth is about 1 AU from the Sun, while Mars is about 1.5 AU from the Sun.