How many centimeters are in an inch? How many meters are in a foot? How many kilometers are in a mile? Here below you will find a simple and fast length converter that you can use directly online! The calculator lets you convert 40 units of length into one another, from the smallest units of the International System up to astronomical distances.
The length converter supports millimeters, centimeters, decimeters, meters, kilometers, inches, feet, yards, statute miles and nautical miles. All SI prefixes from the quectometer to the quettameter are also available, as well as ångström, mil, fathom, link, rod, chain, furlong, astronomical units, light-years and parsecs.
You can also enter extremely large or extremely small numbers. The length calculator accepts scientific notation, for example 1e30 or 1e-30, and maintains high precision even when converting between very different units.
How does the online unit converter work?
Simple! Just type the value in the field for the original unit of measurement to immediately obtain the conversion into all the other units of length.
Converting units of length has never been so easy. You can start with meters, centimeters, millimeters, kilometers, inches, feet, yards, miles or any other unit available in the calculator. All the other values are updated automatically.
The length calculator also handles very large and very small values. You can use either a period or a comma as the decimal separator and enter values in scientific notation, such as 1e20, 1e-15 or 3.5e30.
How much is an inch? How many meters are in a foot? How many kilometers are in a mile?
How many centimeters does a 27-inch monitor measure? How many meters are 10 feet? How many kilometers do you need to travel to cover 100 miles? These are some of the most common length conversions.
Here are some useful formulas for converting the main units of length.
How to convert from inches to centimeters:
centimeters = inches × 2.54
How to convert from centimeters to inches:
inches = centimeters / 2.54
How to convert from feet to meters:
meters = feet × 0.3048
How to convert from meters to feet:
feet = meters / 0.3048
How to convert from yards to meters:
meters = yards × 0.9144
How to convert from meters to yards:
yards = meters / 0.9144
How to convert from statute miles to kilometers:
kilometers = miles × 1.609344
How to convert from kilometers to statute miles:
miles = kilometers / 1.609344
How to convert from nautical miles to kilometers:
kilometers = nautical miles × 1.852
How to convert from kilometers to nautical miles:
nautical miles = kilometers / 1.852
How to convert from millimeters to meters:
meters = millimeters / 1000
How to convert from centimeters to meters:
meters = centimeters / 100
How to convert from kilometers to meters:
meters = kilometers × 1000
How to convert from astronomical units to meters:
meters = astronomical units × 149597870700
How to convert from light-years to meters:
meters = light-years × 9460730472580800
How to convert from parsecs to meters:
meters ≈ parsecs × 3.0856775814913672789139379578e16
Length unit conversion constants
The meter is used as the internal reference unit. The following table shows the value in meters of one unit for each of the length units available in the converter.
| Unit of measurement | Symbol | 1 unit corresponds to | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Quectometer | qm | 1e-30 m | |||||||
| Rontometer | rm | 1e-27 m | |||||||
| Yoctometer | ym | 1e-24 m | |||||||
| Zeptometer | zm | 1e-21 m | |||||||
| Attometer | am | 1e-18 m | |||||||
| Femtometer | fm | 1e-15 m | |||||||
| Picometer | pm | 1e-12 m | |||||||
| Ångström | Å | 1e-10 m | |||||||
| Nanometer | nm | 1e-9 m | |||||||
| Micrometer | µm | 1e-6 m | |||||||
| Millimeter | mm | 0.001 m | |||||||
| Centimeter | cm | 0.01 m | |||||||
| Decimeter | dm | 0.1 m | |||||||
| Meter | m | 1 m | |||||||
| Decameter | dam | 10 m | |||||||
| Hectometer | hm | 100 m | |||||||
| Kilometer | km | 1000 m | |||||||
| Megameter | Mm | 1e6 m | |||||||
| Gigameter | Gm | 1e9 m | |||||||
| Terameter | Tm | 1e12 m | |||||||
| Petameter | Pm | 1e15 m | |||||||
| Exameter | Em | 1e18 m | |||||||
| Zettameter | Zm | 1e21 m | |||||||
| Yottameter | Ym | 1e24 m | |||||||
| Ronnameter | Rm | 1e27 m | |||||||
| Quettameter | Qm | 1e30 m | |||||||
| Mil or thou | mil | 0.0000254 m | |||||||
| Inch | in | 0.0254 m | |||||||
| Foot | ft | 0.3048 m | |||||||
| Yard | yd | 0.9144 m | |||||||
| Fathom | ftm | 1.8288 m | |||||||
|
| |||||||||
| Link | li | 0.201168 m | |||||||
| Rod, pole or perch | rd | 5.0292 m | |||||||
| Chain | ch | 20.1168 m | |||||||
| Furlong | fur | 201.168 m | |||||||
| International mile | mi | 1609.344 m | |||||||
| International nautical mile | nmi | 1852 m | |||||||
| Astronomical unit | au | 149597870700 m | |||||||
| Light-year | ly | 9460730472580800 m | |||||||
| Parsec | pc | approx. 3.0856775814913672789139379578e16 m | |||||||
The prefixes of the International System make it possible to express lengths ranging from 1e-30 meters to 1e30 meters. The converter also includes the ronto, quecto, ronna and quetta prefixes introduced into the International System in 2022.
All calculations you can make with this online calculator
The length converter contains 40 units of length. Each unit can be converted directly into all the other 39 units, for a total of 1,560 possible directional conversions.
Among the most common length conversions that can be performed are:
- inches (in) <> centimeters (cm)
- inches (in) <> millimeters (mm)
- inches (in) <> meters (m)
- centimeters (cm) <> meters (m)
- centimeters (cm) <> millimeters (mm)
- millimeters (mm) <> meters (m)
- meters (m) <> kilometers (km)
- feet (ft) <> meters (m)
- feet (ft) <> centimeters (cm)
- feet (ft) <> inches (in)
- yards (yd) <> meters (m)
- yards (yd) <> feet (ft)
- yards (yd) <> inches (in)
- statute miles (mi) <> kilometers (km)
- statute miles (mi) <> meters (m)
- nautical miles (nmi) <> kilometers (km)
- nautical miles (nmi) <> meters (m)
- micrometers (µm) <> millimeters (mm)
- micrometers (µm) <> nanometers (nm)
- nanometers (nm) <> meters (m)
- ångström (Å) <> nanometers (nm)
- mil or thou <> millimeters (mm)
- mil or thou <> inches (in)
- fathoms (ftm) <> meters (m)
- links (li) <> meters (m)
- rods (rd) <> meters (m)
- chains (ch) <> meters (m)
- furlongs (fur) <> meters (m)
- astronomical units (au) <> kilometers (km)
- astronomical units (au) <> meters (m)
- light-years (ly) <> kilometers (km)
- light-years (ly) <> astronomical units (au)
- parsecs (pc) <> light-years (ly)
- parsecs (pc) <> astronomical units (au)
- parsecs (pc) <> kilometers (km)
It is also possible to convert all the multiples and submultiples of the meter into one another, from the quectometer to the quettameter. Just type the value in any field of the calculator to obtain all the equivalent values at the same time.
This length converter therefore allows you to quickly convert inches to centimeters and centimeters to inches, feet to meters and meters to feet, miles to kilometers and kilometers to miles, as well as all the other units of length available in the calculator.