Length Converter
Convert a length from one unit to another.
Enter the values required below.
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Frequently Asked Questions
How do I use this length converter?
Enter the length you want to convert, select the original unit in the From field, choose the unit you want in the To field, and click Convert. This length conversion calculator supports millimeters, centimeters, meters, kilometers, inches, feet, yards, miles and nautical miles.
How many millimeters are in a centimeter?
One centimeter equals exactly 10 millimeters. Use this millimeters to centimeters converter or centimeters to millimeters conversion when working with small measurements.
How many centimeters are in a meter?
One meter equals exactly 100 centimeters. This simple relationship is one of the most commonly used metric length conversions.
How many meters are in a kilometer?
One kilometer equals exactly 1,000 meters. Kilometers are commonly used for longer distances, while meters are convenient for everyday measurements.
How many inches are in a foot?
One international foot contains exactly 12 inches. This makes inches to feet and feet to inches common conversions in traditional length measurement.
How many feet are in a yard?
One yard equals exactly 3 feet, or 36 inches. This relationship is useful when converting yards to feet, feet to yards and other traditional length units.
How many kilometers are in a mile?
One international mile equals exactly 1.609344 kilometers. This is why a miles to kilometers converter is useful when comparing road distances expressed in different measurement systems.
What is a nautical mile?
A nautical mile is a unit of distance used especially in navigation, aviation and marine travel. One international nautical mile equals exactly 1.852 kilometers, making nautical miles to kilometers a useful conversion.
Can I ask a question?
Yes. If you couldn't find the length conversion answer you're looking for, you can ask us a question below.
💡 Interesting Facts About Length
The ancient cubit was based on the human body
In ancient Egypt, the cubit was based roughly on the distance from a person's elbow to the tip of the middle finger. A commonly cited Egyptian cubit was about 18 inches, or approximately 45 centimeters.
How was the meter originally defined?
In 1791, the French Academy of Sciences proposed defining the meter as one ten-millionth of the distance from the Equator to the North Pole along a meridian. The modern meter is now defined using the speed of light, but the original idea was to create a universal standard based on the Earth.
What is a yottameter?
A yottameter is an extraordinarily large metric unit of length. One yottameter equals 1024 meters — a 1 followed by 24 zeros. It is far beyond everyday distances.
What is a yoctometer?
A yoctometer is the opposite extreme: one yoctometer equals 10-24 meters. It is one septillionth of a meter and is used mainly when discussing extremely tiny scales.
Where did the furlong come from?
The word furlong comes from "furrow long." Historically, it referred roughly to the length of a furrow that a team of oxen could plough before needing to turn. Today, a furlong is standardized as 220 yards, or one-eighth of a mile.
How far is a light-year?
Despite its name, a light-year is a unit of distance rather than time. It is the distance light travels through a vacuum in one year, approximately 9.46 trillion kilometers. Light-years are used mainly for describing enormous astronomical distances.
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