Length units converter

Convert feet to meters, inch to cm, mm to m …

 24 August 2019


UnitConversion.org – the universal assistant for all of your unit conversion needs.

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How to use the Length Units Converter

  1. Select the unit you want to convert from in the input unit list on the left.
  2. Select the unit you want to convert to in the output unit list on the right.
  3. Enter the value of the input unit to convert from in the input box on the left.
  4. The tool will immediately display the equivalent value of the output unit in the output box on the right.

Steps 1 to 3 may be executed in random order.

The value of your input unit can be converted to any other unit by just selecting a different output unit in the list on the right.

Metric length conversion

The metric system, also known as the International System of Units (SI), is a decimalized system of measurement based on factors of ten. This means that units within the system get larger or smaller by a power of 10.

SI definition of the meter

The meter is the length of the path traveled by light in vacuum during a time interval of 1/299 792 458 s.

The base unit of length is the meter. Multiples and submultiples are indicated by a system of prefixes, e.g. kilo-, hecto-, deka-, deci-, centi-, milli-… as can be seen in the table below. Please note that this table is not complete and doesn’t show all possible prefixes.

metric length conversion table

Examples of conversion:

1 kilometer = 1 x 10 = 10 hectometer

1 meter = 1 x 10 x 10 = 100 centimeter

25 millimeter = 25 x 1 10 x 1 10 x 1 10 = 0.025 meter

10000 decimeter = 10000 x 1 10 x 1 10 x 1 10 x 1 10 = 1 kilometer

Imperial and US customary length conversion

The US Customary system is similar to, but not to be confused with, the Imperial system still used in the United Kingdom. There are differences between the two systems, especially for units of volume and mass. But for length units, they are the same.

The units of length in the US Customary system have two slightly different definitions, leading to two different systems of measure: the International measure and the US Survey measure.

International measure

The international measure uses the same definition for the units of length as the imperial system. One inch international measure is exactly 25.4 millimeters.

The United States primarily uses International measure units in commercial activities, engineering, and for personal daily use.

international measure length conversion table

Examples of conversion:

1 mile = 1 x 1760 = 1760 yard

1 yard = 1 x 3 x 12 = 36 inch

6.3 foot = 6.3 x 1 3 = 2.1 yard

63360 inch = 63360 x 1 12 x 1 3 x 1 1760 = 1 mile

US Survey measure

US Survey measure uses a different and older definition for the units of length whereby one inch is defined in such a way that 39.37 inches equal exactly 1 meter. The units of the US Survey measure are only used for surveying.

The difference between an international foot and a survey foot is very small. One international foot is exactly 0.999998 of a US survey foot. This makes it a difference of about 1 8 inch (3mm) per mile.

US Survey measure length conversion table

Examples of conversion:

1 league = 1 x 3 = 3 survey mile

1 furlong = 1 x 10 x 4 = 40 rod

660 survey foot = 660 x 1 16.5 x 1 4 x 1 10 = 1 furlong

100 link = 100 x 66 100 x 1 16.5 x 1 4 = 1 chain


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