Inch. Conversion Chart

This conversion page features historical units (ancient, medieval, etc.) that are mostly no longer in use. If you are looking for units of length that are used today, including many national units of various countries, please switch to our main length conversion page.
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Metric

We only include several basic units here for you to convert historical units to contemporary ones. A more comprehensive list of metric units is available on the main length conversion page.
inch to kilometer (km)
inch to meter (m)
inch to centimeter (cm)
inch to millimeter (mm)
Units: kilometer (km)  / meter (m)  / centimeter (cm)  / millimeter (mm)
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The American System of Measures (US Customary Units)

We only include several basic units here for you to convert historical units to contemporary ones. A more comprehensive list of U.S. units is available on the main length conversion page.
inch to mile (mi)
inch to yard (yd)
inch to inch (in)
Units: mile (mi)  / yard (yd)  / foot (ft)  / inch (in)
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Ancient Egypt

It might be hard to imagine, but these units dates back to 3100 BC. Egyptian people used them 5000 years ago. These units are distant ancestors of US customary units used today.
inch to iteru (river measure)
inch to knet (rod of cord)
inch to nbiw (pole)
inch to meh niswt (royal cubit)
inch to meh nedjes (short cubit)
inch to remen
inch to djeser, bu
inch to pedj-aa (large span)
inch to pedj-sheser (small span)
inch to amem (fist)
inch to deret (hand)
inch to shesep (palm)
inch to djeba (finger)
Units: iteru (river measure)  / knet (rod of cord)  / nbiw (pole)  / meh niswt (royal cubit)  / meh nedjes (short cubit)  / remen  / djeser, bu  / pedj-aa (large span)  / pedj-sheser (small span)  / amem (fist)  / deret (hand)  / shesep (palm)  / djeba (finger)
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Ancient Greek

The values of Greek units varied according to location and epoch. Relative proportions though were generally the same. Greek measures were in general derived from measurement system of Ancient Egypt.
inch to schoinos (σχοινός)
inch to parasanges (παρασάγγες, league)
inch to dolichos (δόλιχος)
inch to milion (μίλιον)
inch to hippikon (ἱππικόν)
inch to diaulos (δίαυλος)
inch to στάδιον, stadion
inch to stadium olympic
inch to stadium attic
inch to stadium ptolemey
inch to plethron (πλέθρον)
inch to hamma (ἅμμα)
inch to dekapous (δεκάπους)
inch to akaina (ἄκαινα)
inch to kalamos (κάλαμος)
inch to orgyia (ὄργυια, fathom)
inch to diploun bēma (διπλοῦν βῆμα, double pace)
inch to haploun bēma (ἁπλοῦν βῆμα, single pace)
inch to pēchys (πῆχυς, elbow)
inch to pygōn (πυγών)
inch to pygmē (πυγμή, forearm)
inch to pous (πούς, foot)
inch to spithamē (σπιθαμή, span of all fingers)
inch to orthodōron (ὀρθόδωρον, wrist to the tip of meddle finger)
inch to lichas (λιχάς)
inch to hemipodion (ἡμιπόδιον)
inch to dichas (διχάς, midfoot)
inch to dōron (δῶρον)
inch to palaiste (παλαιστή, palm)
inch to kondylos (κόνδυλος, two fingers)
inch to daktylos (δάκτυλος, finger)
Units: schoinos (σχοινός)  / parasanges (παρασάγγες, league)  / dolichos (δόλιχος)  / milion (μίλιον)  / hippikon (ἱππικόν)  / diaulos (δίαυλος)  / στάδιον, stadion  / stadium olympic  / stadium attic  / stadium ptolemey  / plethron (πλέθρον)  / hamma (ἅμμα)  / dekapous (δεκάπους)  / akaina (ἄκαινα)  / kalamos (κάλαμος)  / orgyia (ὄργυια, fathom)  / diploun bēma (διπλοῦν βῆμα, double pace)  / haploun bēma (ἁπλοῦν βῆμα, single pace)  / pēchys (πῆχυς, elbow)  / pygōn (πυγών)  / pygmē (πυγμή, forearm)  / pous (πούς, foot)  / spithamē (σπιθαμή, span of all fingers)  / orthodōron (ὀρθόδωρον, wrist to the tip of meddle finger)  / lichas (λιχάς)  / hemipodion (ἡμιπόδιον)  / dichas (διχάς, midfoot)  / dōron (δῶρον)  / palaiste (παλαιστή, palm)  / kondylos (κόνδυλος, two fingers)  / daktylos (δάκτυλος, finger)
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Ancient Roman

Roman length units were very well defined. The value of the base unit pes (foot) was discovered by John Greaves in 1639 after he made a lot of measurements in the ruins of Rome. Since then we know that the value of one pes was between 0.967 and 0.986 English feet. An accepted modern value is 296 mm. For most Roman units below we give an English equivalent in parentheses.
inch to schœnus (rush rope)
inch to leuga (league)
inch to mille passus (mile)
inch to stadium (stade, furlong)
inch to actus
inch to decempeda
inch to pertica (perch)
inch to passus (pace)
inch to pes sestertius
inch to gradus (step)
inch to cubitus (cubit)
inch to palmipes
inch to pes (foot)
inch to palmus major (palm length)
inch to palmus (palm width)
inch to uncia (inch)
inch to pollex (thumb)
inch to digitus (finger)
Units: schœnus (rush rope)  / leuga (league)  / mille passus (mile)  / stadium (stade, furlong)  / actus  / decempeda  / pertica (perch)  / passus (pace)  / pes sestertius  / gradus (step)  / cubitus (cubit)  / palmipes  / pes (foot)  / palmus major (palm length)  / palmus (palm width)  / uncia (inch)  / pollex (thumb)  / digitus (finger)
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Biblical

inch to cubit
inch to span
inch to handbreadth
inch to etzbah
Units: cubit  / span  / handbreadth  / etzbah
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Old Spanish

In various provinces of Spain diferent variations of units were used. The conversions below use Castilian system. Although most of these units are now obsolete, some can still be used today in the countries of Latin America.
inch to legua de por grado (league of the degree)
inch to legua marina (nautical)
inch to legua
inch to milla marina (nautical)
inch to milla
inch to cuerda of Valencia
inch to cuerda
inch to estadal
inch to braza
inch to paso
inch to vara
inch to codo de ribera
inch to codo
inch to pie
inch to palmo
inch to coto
inch to pulgada
inch to linea
inch to punto
Units: legua de por grado (league of the degree)  / legua marina (nautical)  / legua  / milla marina (nautical)  / milla  / cuerda of Valencia  / cuerda  / estadal  / braza  / paso  / vara  / codo de ribera  / codo  / pie  / palmo  / coto  / pulgada  / linea  / punto
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Old Portuguese

These units were used in Portugal, Brazil and other countries of the Portuguese Empire until the adoption of the metric system in 19th century.
inch to braça
inch to toesa
inch to passo geométrico
inch to vara
inch to côvado
inch to pé
inch to palmo de craveira
inch to polegada
inch to linha
inch to ponto
Units: braça  / toesa  / passo geométrico  / vara  / côvado  /  / palmo de craveira  / polegada  / linha  / ponto
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Old French

There were many local variations; the following are Quebec and Paris definitions
inch to lieue commune
inch to lieue marine
inch to lieue de post
inch to lieue metrique
inch to arpent
inch to perche
inch to toise
inch to pied [foot]
inch to pouce [inch]
inch to ligne
Units: lieue commune  / lieue marine  / lieue de post  / lieue metrique  / arpent  / perche  / toise  / pied [foot]  / pouce [inch]  / ligne
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Old Russian

inch to mile
inch to verst
inch to mezhevaya verst
inch to kosaya sazhen
inch to sazhen
inch to makhovaya sazhen
inch to arshin
inch to ell
inch to foot
inch to pyad
inch to vershok
inch to line
Units: mile  / verst  / mezhevaya verst  / kosaya sazhen  / sazhen  / makhovaya sazhen  / arshin  / ell  / foot  / pyad  / vershok  /  / line
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Old German (Prussian)

These units were used before adoption of metric system in 1872.
inch to meile
inch to ruthe
inch to elle
inch to fuss
inch to zoll
inch to linie
Units: meile  / ruthe  / elle  / fuss  / zoll  / linie
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Old Austrian

These units were used before adoption of metric system in 1871.
inch to meile
inch to ruthe
inch to klafner
inch to fuss
inch to zoll
inch to linie
inch to punkt
Units: meile  / ruthe  / klafner  / fuss  / zoll  / linie  / punkt
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Old Swedish

Common measurement system was introduced in Sweden by law in 1665. Since then the system was slightly altered twice: in 1735 and 1855. Sweden switched to metric system in 1889.
inch to nymil (new mile, used since 1889 till now)
inch to mil (mile)
inch to fjärdingsväg
inch to rev before 1855
inch to rev after 1855
inch to stång
inch to famn (fanthom)
inch to aln (forealrm)
inch to fot (foot)
inch to kvarter
inch to tvärhand (hand)
inch to tum (thumb or inch) before 1855
inch to tum (thumb or inch) after 1855
inch to linje (line) before 1855
inch to linje (line) after 1855
Units: nymil (new mile, used since 1889 till now)  / mil (mile)  / fjärdingsväg  / rev before 1855  / rev after 1855  / stång  / famn (fanthom)  / aln (forealrm)  / fot (foot)  / kvarter  / tvärhand (hand)  / tum (thumb or inch) before 1855  / tum (thumb or inch) after 1855  / linje (line) before 1855  / linje (line) after 1855

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