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Length Converter – 22 units of length

Convert length between cm, in, mm, m, ft, km and more – exact and instant.

1 cm = 0.3937007874 in

Formula: in = cm ÷ 2.54

Common values
Decimals
In every unit 22 units
Nanometer (nm) 10,000,000 nm
Micrometer (µm) 10,000 µm
Millimeter (mm) 10 mm
Centimeter (cm) 1 cm
Decimeter (dm) 0.1 dm
Meter (m) 0.01 m
Kilometer (km) 0.00001 km
Inch (in) 0.3937007874 in
Foot (ft) 0.03280839895 ft
Yard (yd) 0.01093613298 yd
Mile (mi) 0.000006213711922 mi
Nautical mile (nmi) 0.000005399568035 nmi
Mil (thou) (mil) 393.7007874 mil
Hand (hh) 0.09842519685 hh
Fathom (ftm) 0.005468066492 ftm
Chain (ch) 0.0004970969538 ch
Furlong (fur) 0.00004970969538 fur
League (lea) 0.000002071237307 lea
Ångström (Å) 100,000,000 Å
Astronomical unit (au) 6.684587122 × 10⁻¹⁴ au
Light-year (ly) 1.057000834 × 10⁻¹⁸ ly
Parsec (pc) 3.240779289 × 10⁻¹⁹ pc

Convert on our server?

If you continue, the file is uploaded over an encrypted connection and converted on our server. You can keep using the site meanwhile. The original is deleted as soon as it is converted; the result is kept for 6 hours so you can download it, and you can delete it at any time. Files are never shared or used for anything else.

Calculated in your browser – nothing you type is sent anywhere. Privacy details

Units of length

Nanometer (nm)SI (metric) unit1 nm = 1 × 10⁻⁹ m
Micrometer (µm)SI (metric) unit1 µm = 0.000001 m
Millimeter (mm)SI (metric) unit1 mm = 0.001 m
Centimeter (cm)SI (metric) unit1 cm = 0.01 m
Decimeter (dm)SI (metric) unit1 dm = 0.1 m
Meter (m)SI (metric) unit
Kilometer (km)SI (metric) unit1 km = 1,000 m
Inch (in)imperial and US customary unit1 in = 0.0254 m
Foot (ft)imperial and US customary unit1 ft = 0.3048 m
Yard (yd)imperial and US customary unit1 yd = 0.9144 m
Mile (mi)imperial and US customary unit1 mi = 1,609.344 m
Nautical mile (nmi)nautical unit1 nmi = 1,852 m
Mil (thou) (mil)imperial and US customary unit1 mil = 0.0000254 m
Hand (hh)imperial and US customary unit1 hh = 0.1016 m
Fathom (ftm)nautical unit1 ftm = 1.8288 m
Chain (ch)imperial and US customary unit1 ch = 20.1168 m
Furlong (fur)imperial and US customary unit1 fur = 201.168 m
League (lea)imperial and US customary unit1 lea = 4,828.032 m
Ångström (Å)unit1 Å = 1 × 10⁻¹⁰ m
Astronomical unit (au)astronomical unit1 au = 149,597,870,700 m
Light-year (ly)astronomical unit1 ly = 9.460730473 × 10¹⁵ m
Parsec (pc)astronomical unit1 pc = 3.085677581 × 10¹⁶ m

How to use: Length Converter

  1. 1 Pick the unit you have and the unit you need.
  2. 2 Type the value – the result in the other unit appears at once (type in the result field to convert back).
  3. 3 Use a common value, set the decimals or swap the units with one click.
  4. 4 Open “In every unit” to see the value in all 22 units of length.

About this tool

Length is the distance between two points. Most of the world measures it in metres, centimetres and kilometres; the United States and, for some uses, the United Kingdom use inches, feet, yards and miles, and ships and aircraft use nautical miles.

Here every value is converted through the meter (m). Choose any two of the 22 units below the converter, or start from one of the popular conversions.

Calculated in your browser – nothing you type is sent anywhere.

Frequently asked questions

Which units of length can I convert?

Nanometer (nm), Micrometer (µm), Millimeter (mm), Centimeter (cm), Decimeter (dm), Meter (m), Kilometer (km), Inch (in), Foot (ft), Yard (yd), Mile (mi), Nautical mile (nmi), Mil (thou) (mil), Hand (hh), Fathom (ftm), Chain (ch), Furlong (fur), League (lea), �
ngström (�
), Astronomical unit (au), Light-year (ly) and Parsec (pc).

Which length conversions are used most?

1 cm = 0.3937007874 in; 1 mm = 0.03937007874 in; 1 m = 3.280839895 ft; 1 cm = 0.03280839895 ft; 1 km = 0.6213711922 mi; 1 m = 1.093613298 yd.

How exact is the converter?

Each unit is defined by its official value in m, so conversions are exact up to the 10 significant digits shown; you can round to 0–6 decimals.

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