Button. 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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This converter is very easy. Really.

1This is a conversion chart for button (British Imperial Measure before 1963). To switch the unit simply find the one you want on the page and click it.
You can also go to the universal conversion page.
2Enter the value you want to convert (button). Then click the Convert Me button.
Your value gets instantly converted to all other units on the page.
3Now find the unit you want and get the conversion result next to it. It's your answer.

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  1. Enter the value of your unit .
  2. Touch "Convert Me" button.
  3. Get instant resuls.
? Conversion settings:
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Conversion settings explained

First of all, you don't have to change any settings to use the converter. It's absolutely optional.

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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  • Significant figures:
  • Digit groups separator:
Your value (button):
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Metric

button to kilometer (km)
button to meter (m)
button to decimeter (dm)
button to centimeter (cm)
button to millimeter (mm)
button to micrometre (micron)
button to nanometer (nm)
button to ångström
Units: kilometer (km)  / meter (m)  / decimeter (dm)  / centimeter (cm)  / millimeter (mm)  / 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.

button to league
button to mile (mi)
button to land
button to furlong
button to bolt
button to chain
button to pole
button to rod (rd)
button to perch
button to yard (yd)
button to feet and inches (x'y")
button to span
button to hand
button to inch (in)
button to line
button to mil
button 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.
button to league
button to mile (mi)
button to land
button to skein
button to bolt
button to shackle
button to furlong
button to chain
button to rope
button to pole
button to goad
button to ell
button to yard (yd)
button to pace
button to cubit (cu)
button to foot (ft)
button to span (sp)
button to nail
button to shaftment
button to hand (hd)
button to palm (plm)
button to inch (in)
button to finger
button to digit
button to barleycorn
button to poppyseed
button to line
button to caliber
button to thou (th)
button 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  /  / caliber  / thou (th)  / mil
» show »
» hide »

US Surveyors' Measure

button to furlong
button to Ramsden's (engineers') chain (ch)
button to Gunter's (surveyors') chain (ch)
button to Gurley's chain (ch)
button to Gunter's (surveyors') pole
button to Gunter's (surveyors') yard
button 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)
» show »
» hide »

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.
button to nautical league (naut.leag)
button to nautical mile (naut.mi)
button to cable length (cbl)
button 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.
button to US nautical mile
button 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.
button to Admiralty mile
button to Admiralty cable length
Units: Admiralty mile  / Admiralty cable length
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» hide »

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.
button to cuadra of Argentina
button to cuadra of Bolivia
button to cuadra of Chile
button to cuadra of Colombia
button to cuadra of Ecuador
button to cuadra of Nicaragua
button to cuadra of Paraguay
button to cuadra of Uruguay
button to vara of Argentina
button to vara of Brazil
button to vara of Chile
button to vara of Colombia
button to vara of Costa Rica
button to vara of Cuba
button to vara of Dominican Republic
button to vara of Ecuador
button to vara of El Salvador
button to vara of Guatemala
button to vara of Honduras
button to vara of Mexico
button to vara of Nicaragua
button to vara of Panama
button to vara of Paraguay
button to vara of Peru (peruana)
button to vara of Peru (española)
button to vara of Uruguay
button to vara of São Tomé and Principe
button 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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» hide »

Japanese

button to ri (里)
button to cho (町)
button to jo (丈)
button to hiro (尋)
button to ken (間)
button to shaku (尺)
button to sun (寸)
button to bu (分)
button to rin (厘)
button 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)
» show »
» hide »

Chinese units of 1930

button to li (市里)
button to yin (引)
button to zhang (市丈)
button to chi (市尺)
button to cun (市寸)
button to fen (市分)
button to li (釐 or 厘)
button to hao (毫)
button to si (丝)
button 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)
» show »
» hide »

Chinese units of 1915

button to li (里)
button to yin (引)
button to zhang (丈)
button to bu (步)
button to chi (尺)
button to cun (寸)
button to fen (分)
button to li (釐 or 厘)
button to hao (毫)
button to si (丝)
button 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)
» show »
» hide »

Hong Kong units

button to cek (尺)
button to tsun (寸)
button 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.
button to yot (โยชน์, league)
button to sen (เส้น, rope)
button to wa (วา, fathom)
button to sok (ศอก, cubit)
button to khuep (คืบ, span)
button to nio (นิ้ว, finger)
button 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)
» show »
» hide »

Optical

button to dioptre (diopter)
Units: dioptre (diopter)
» show »
» hide »

Geographical (German)

button to geographical mile
Units: geographical mile
» show »
» hide »

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.
button to rack unit (U)
button to horizontal pitch (HP)
Units: rack unit (U)  / horizontal pitch (HP)
» show »
» hide »

Typographical (British and U.S. - ATA system)

button to pica
button to pica [PostScript]
button to point (pt)
button to point [PostScript] (pt)
button to pixel (px)
button to twip
Units: pica  / pica [PostScript]  / point (pt)  / point [PostScript] (pt)  / pixel (px)  / twip
» show »
» hide »

Typographical (Europe - Didot system)

button to cicero
button to point (pt)
Units: cicero  / point (pt)
» show »
» hide »

European footwear unit

button to Paris point
Units: Paris point
» show »
» hide »

Astronomical

button to red shift (z)
button to parsec (pc)
button to light year
button to astronomical unit (au)
button to light minute
button to light second
Units: red shift (z)  / parsec (pc)  / light year  / astronomical unit (au)  / light minute  / light second
» show »
» hide »

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.
button to light microsecond
button to light nanosecond
button to light picosecond
Units: light microsecond  / light nanosecond  / light picosecond
» show »
» hide »

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.
button to Planck length (L)
Units: Planck length (L)

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