mm - Millimeter. Conversion Chart

This converter features contemporary units of length. There is also a special converter for historical units of length you might want to visit for ancient, medieval and other old units that are no longer used.
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1This is a conversion chart for millimeter (Metric). To switch the unit simply find the one you want on the page and click it.
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Number of significat figures

Do you want rounded off figures or scientifically precise ones? For everyday conversions we recommend choosing 3 or 4 significant digits. If you want maximum precision, set the number to 9

Digit groups separator

Choose how you want to have your digit groups separated in long numbers:

1234567.89none
1 234 567.89space
1,234,567.89comma
1.234.567,89point

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Your value (millimeter, mm):
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Metric

millimeter to kilometer (km)
millimeter to meter (m)
millimeter to decimeter (dm)
millimeter to centimeter (cm)
millimeter to micrometre (micron)
millimeter to nanometer (nm)
millimeter to ångström
Units: kilometer (km)  / meter (m)  / decimeter (dm)  / centimeter (cm)  /  / micrometre (micron)  / nanometer (nm)  / ångström
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The American System (US Customary Units) and British Imperial Measures

American weights and measures are based on units used in Britain prior to 1826, when imperial system was officially established. Until 1960-1963 American and British units of length were different in 2 parts per million. In the middle of 20th century it started causing problems and the governments of the two countries agreed to refine the measures to exactly match. Since then Great Britain and the United States were using the same measures of length. In the U.S. the old standard of foot was retained with the name US survey foot.

From 1995 the UK adopted metric units for general use. The only imperial measures of length that can be officially used now are miles, yards, feet and inches for road traffic signs.

millimeter to league
millimeter to mile (mi)
millimeter to land
millimeter to furlong
millimeter to bolt
millimeter to chain
millimeter to pole
millimeter to rod (rd)
millimeter to perch
millimeter to yard (yd)
millimeter to feet and inches (x'y")
millimeter to span
millimeter to hand
millimeter to inch (in)
millimeter to line
millimeter to mil
millimeter to microinch
Units: league  / mile (mi)  / land  / furlong  / bolt  / chain  / pole  / rod (rd)  / perch  / yard (yd)  / foot (ft)  / feet and inches (x'y")  / span  / hand  / inch (in)  / line  / mil  / microinch
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British Imperial Measure before 1963

The first English official measurement standards were defined in 15th century. British system of units, known as imperial units, was established in 1824. The British Weights and Meausurements Act of 1824 repealed all existing British measures legislation and redefined existing units. The 1963 Weights and Measures Act standartized the international measures.
millimeter to league
millimeter to mile (mi)
millimeter to land
millimeter to skein
millimeter to bolt
millimeter to shackle
millimeter to furlong
millimeter to chain
millimeter to rope
millimeter to pole
millimeter to goad
millimeter to ell
millimeter to yard (yd)
millimeter to pace
millimeter to cubit (cu)
millimeter to foot (ft)
millimeter to span (sp)
millimeter to nail
millimeter to shaftment
millimeter to hand (hd)
millimeter to palm (plm)
millimeter to inch (in)
millimeter to finger
millimeter to digit
millimeter to barleycorn
millimeter to poppyseed
millimeter to line
millimeter to button
millimeter to caliber
millimeter to thou (th)
millimeter to mil
Units: league  / mile (mi)  / land  / skein  / bolt  / shackle  / furlong  / chain  / rope  / pole  / goad  / ell  / yard (yd)  / pace  / cubit (cu)  / foot (ft)  / span (sp)  / nail  / shaftment  / hand (hd)  / palm (plm)  / inch (in)  / finger  / digit  / barleycorn  / poppyseed  / line  / button  / caliber  / thou (th)  / mil
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US Surveyors' Measure

millimeter to furlong
millimeter to Ramsden's (engineers') chain (ch)
millimeter to Gunter's (surveyors') chain (ch)
millimeter to Gurley's chain (ch)
millimeter to Gunter's (surveyors') pole
millimeter to Gunter's (surveyors') yard
millimeter to Gunter's (surveyors') foot (ft)
Units: furlong  / Ramsden's (engineers') chain (ch)  / Gunter's (surveyors') chain (ch)  / Gurley's chain (ch)  / Gunter's (surveyors') pole  / Gunter's (surveyors') yard  / Ramsden's (engineers') link  / Gunter's (surveyors') link  / Gurley's link  / Gunter's (surveyors') foot (ft)
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International Nautical Measure

The international nautical mile was defined by the First International Extraordinary Hydrographic Conference, Monaco in 1929. This is the only definition in widespread current use, and is the one accepted by the International Bureau of Weights and Measures. Before 1929 different countries had different definitions, and the Soviet Union, the United Kingdom and the United States did not immediately accept the international value.
millimeter to nautical league (naut.leag)
millimeter to nautical mile (naut.mi)
millimeter to cable length (cbl)
millimeter to fathom (fath)
Units: nautical league (naut.leag)  / nautical mile (naut.mi)  / cable length (cbl)  / fathom (fath)
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US Nautical Measure

These measures were abandoned in favor of the international nautical measures in 1954.
millimeter to US nautical mile
millimeter to US fathom (fath)
Units: US nautical mile  / US cable length  / US fathom (fath)
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British (Imperial) Nautical Measure

These measures were abandoned in favor of the international nautical measures in 1970.
millimeter to Admiralty mile
millimeter to Admiralty cable length
Units: Admiralty mile  / Admiralty cable length
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Spanish Customary Units Still In Use Today

These units are still actively used in some countries of Latin America. Their values vary from country to country. You can find more old Spanish customary units on our historical lengths page.
millimeter to cuadra of Argentina
millimeter to cuadra of Bolivia
millimeter to cuadra of Chile
millimeter to cuadra of Colombia
millimeter to cuadra of Ecuador
millimeter to cuadra of Nicaragua
millimeter to cuadra of Paraguay
millimeter to cuadra of Uruguay
millimeter to vara of Argentina
millimeter to vara of Brazil
millimeter to vara of Chile
millimeter to vara of Colombia
millimeter to vara of Costa Rica
millimeter to vara of Cuba
millimeter to vara of Dominican Republic
millimeter to vara of Ecuador
millimeter to vara of El Salvador
millimeter to vara of Guatemala
millimeter to vara of Honduras
millimeter to vara of Mexico
millimeter to vara of Nicaragua
millimeter to vara of Panama
millimeter to vara of Paraguay
millimeter to vara of Peru (peruana)
millimeter to vara of Peru (española)
millimeter to vara of Uruguay
millimeter to vara of São Tomé and Principe
millimeter to vara of Venezuela
Units: cuadra of Argentina  / cuadra of Bolivia  / cuadra of Chile  / cuadra of Colombia  / cuadra of Ecuador  / cuadra of Nicaragua  / cuadra of Paraguay  / cuadra of Uruguay  / vara of Argentina  / vara of Brazil  / vara of Chile  / vara of Colombia  / vara of Costa Rica  / vara of Cuba  / vara of Dominican Republic  / vara of Ecuador  / vara of El Salvador  / vara of Guatemala  / vara of Honduras  / vara of Mexico  / vara of Nicaragua  / vara of Panama  / vara of Paraguay  / vara of Peru (peruana)  / vara of Peru (española)  / vara of Uruguay  / vara of São Tomé and Principe  / vara of Venezuela
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Japanese

millimeter to ri (里)
millimeter to cho (町)
millimeter to jo (丈)
millimeter to hiro (尋)
millimeter to ken (間)
millimeter to shaku (尺)
millimeter to sun (寸)
millimeter to bu (分)
millimeter to rin (厘)
millimeter to mo (毛, 毫)
Units: ri (里)  / cho (町)  / jo (丈)  / hiro (尋)  / ken (間)  / shaku (尺)  / sun (寸)  / bu (分)  / rin (厘)  / mo (毛, 毫)
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Chinese units of 1930

millimeter to li (市里)
millimeter to yin (引)
millimeter to zhang (市丈)
millimeter to chi (市尺)
millimeter to cun (市寸)
millimeter to fen (市分)
millimeter to li (釐 or 厘)
millimeter to hao (毫)
millimeter to si (丝)
millimeter to hu (忽)
Units: li (市里)  / yin (引)  / zhang (市丈)  / chi (市尺)  / cun (市寸)  / fen (市分)  / li (釐 or 厘)  / hao (毫)  / si (丝)  / hu (忽)
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Chinese units of 1915

millimeter to li (里)
millimeter to yin (引)
millimeter to zhang (丈)
millimeter to bu (步)
millimeter to chi (尺)
millimeter to cun (寸)
millimeter to fen (分)
millimeter to li (釐 or 厘)
millimeter to hao (毫)
millimeter to si (丝)
millimeter to hu (忽)
Units: li (里)  / yin (引)  / zhang (丈)  / bu (步)  / chi (尺)  / cun (寸)  / fen (分)  / li (釐 or 厘)  / hao (毫)  / si (丝)  / hu (忽)
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Hong Kong units

millimeter to cek (尺)
millimeter to tsun (寸)
millimeter to fan (分)
Units: cek (尺)  / tsun (寸)  / fan (分)
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Thai units

Some of these units are still in use even though metric system was formally established in 1923. Before the metrication the old units were standartied to exact metric values.
millimeter to yot (โยชน์, league)
millimeter to sen (เส้น, rope)
millimeter to wa (วา, fathom)
millimeter to sok (ศอก, cubit)
millimeter to khuep (คืบ, span)
millimeter to nio (นิ้ว, finger)
millimeter to krabiat (กระเบียด, quarter of a finger)
Units: yot (โยชน์, league)  / sen (เส้น, rope)  / wa (วา, fathom)  / sok (ศอก, cubit)  / khuep (คืบ, span)  / nio (นิ้ว, finger)  / krabiat (กระเบียด, quarter of a finger)
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Optical

millimeter to dioptre (diopter)
Units: dioptre (diopter)
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Geographical (German)

millimeter to geographical mile
Units: geographical mile
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Computer Equipment

A rack unit, U or RU is a unit of measure that describes the height of equipment designed to mount in a 19-inch rack or a 23-inch rack. The 19-inch (482.6 mm) or 23-inch (584.2 mm) dimension refers to the width of the equipment mounting frame in the rack including the frame; the width of the equipment that can be mounted inside the rack is less.
millimeter to rack unit (U)
millimeter to horizontal pitch (HP)
Units: rack unit (U)  / horizontal pitch (HP)
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Typographical (British and U.S. - ATA system)

millimeter to pica
millimeter to pica [PostScript]
millimeter to point (pt)
millimeter to point [PostScript] (pt)
millimeter to pixel (px)
millimeter to twip
Units: pica  / pica [PostScript]  / point (pt)  / point [PostScript] (pt)  / pixel (px)  / twip
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Typographical (Europe - Didot system)

millimeter to cicero
millimeter to point (pt)
Units: cicero  / point (pt)
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European footwear unit

millimeter to Paris point
Units: Paris point
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Astronomical

millimeter to red shift (z)
millimeter to parsec (pc)
millimeter to light year
millimeter to astronomical unit (au)
millimeter to light minute
millimeter to light second
Units: red shift (z)  / parsec (pc)  / light year  / astronomical unit (au)  / light minute  / light second
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Grace Hopper's units of distance

Grace Hopper is famous for her nanoseconds visual aid. People used to ask her why satellite communication took so long. She started handing out pieces of wire that were just under one foot long (11.80 inches) — the distance that light travels in one nanosecond. She also passed out packets of pepper, calling the individual grains of ground pepper picoseconds. She also used these aids to illustrate why computers had to be small to be fast.
millimeter to light microsecond
millimeter to light nanosecond
millimeter to light picosecond
Units: light microsecond  / light nanosecond  / light picosecond
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Natural units

In physics, natural units are physical units of measurement based only on universal physical constants. The origin of their definition comes only from properties of nature and not from any human construct.
millimeter to Planck length (L)
Units: Planck length (L)

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