Length Converter
Convert between metric, US customary and imperial units of length and distance, from micrometers to miles. Inch, foot, yard and mile conversions use the exact 1959 international definitions.
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Convert millimeters
Convert yards
Convert nautical miles
Convert micrometers
Length units
- Centimeter (cm)
- A centimeter is one hundredth of a meter. It is the everyday metric unit for body height, clothing sizes and small objects.
- Inch (in)
- An inch is exactly 2.54 centimeters, one twelfth of a foot. It is used in the United States for everyday measurements and worldwide for screen sizes.
- Meter (m)
- The meter is the SI base unit of length, defined as the distance light travels in a vacuum in 1/299,792,458 of a second.
- Foot (ft)
- A foot is 12 inches, exactly 0.3048 meters. It is used in the United States for height and building dimensions, and in aviation in most of the world for altitude.
- Kilometer (km)
- A kilometer is 1,000 meters. It is the standard unit for road distances and speed limits in most of the world.
- Mile (mi)
- The international (statute) mile is 5,280 feet, exactly 1,609.344 meters. It is used for road distances in the United States and the United Kingdom.
- Millimeter (mm)
- A millimeter is one thousandth of a meter. It is the usual unit for engineering drawings, hardware sizes and rainfall.
- Yard (yd)
- A yard is 3 feet, defined as exactly 0.9144 meters by the 1959 international yard and pound agreement. It is used for fabric, golf and American football distances.
- Nautical mile (nmi)
- The international nautical mile is exactly 1,852 meters, roughly one minute of arc of latitude. It is the standard distance unit in marine and air navigation.
- Micrometer (µm)
- A micrometer, also called a micron, is one millionth of a meter. It is used for cell sizes, particle sizes and machining tolerances.
- Nanometer (nm)
- A nanometer is one billionth of a meter. It is used for wavelengths of light and semiconductor feature sizes.
- Decimeter (dm)
- A decimeter is one tenth of a meter, or 10 centimeters. A cube one decimeter on each side holds one liter.
- Furlong (fur)
- A furlong is 660 feet, one eighth of a mile, exactly 201.168 meters. It survives mainly in horse racing.
- Fathom (ftm)
- A fathom is 6 feet, exactly 1.8288 meters. It is a traditional unit for water depth on nautical charts.
- Light-year (ly)
- A light-year is the distance light travels in a vacuum in one Julian year of 365.25 days, exactly 9,460,730,472,580,800 meters. It is used for distances between stars and galaxies.
- Astronomical unit (au)
- The astronomical unit is exactly 149,597,870,700 meters, approximately the mean distance between the Earth and the Sun. It is used for distances within the solar system.