Convert Historical Area Units Instantly

This conversion page features historical units (ancient, medieval, etc.) that are mostly no longer in use. If you are looking for units of area that are used today, including many national units of various countries, please switch to our main area conversion page.
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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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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 area conversion page.
square kilometer (km²)
hectare
square meter (m²)
square centimeter (cm²)
square millimeter (mm²)
Units: square kilometer (km²)  / hectare  / square meter (m²)  / square centimeter (cm²)  / square millimeter (mm²)
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British (Imperial) And U.S. System

We only include several basic units here for you to convert historical units to contemporary ones. A more comprehensive list of British and U.S. units is available on the main area conversion page.
square mile
acre
square yard (yd²)
square foot (ft²)
square inch (in²)
Units: square mile  / acre  / square yard (yd²)  / square foot (ft²)  / square inch (in²)
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Ancient Greek

plethron (πλέθρον)
aroura (ἄρουρα)
hektos (ἕκτος)
hēmiektos (ἡμίεκτος)
dodecaorgion (δωδεκάωργον)
decaorgion (δεκάωργον)
akaina (ἄκαινα)
hexapodēs or orgya (ἑξαπόδης, ὀργυιά)
bema or diploum (βῆμα, ἀπλοῦν)
pous (πούς), square foot
Units: plethron (πλέθρον)  / aroura (ἄρουρα)  / hektos (ἕκτος)  / hēmiektos (ἡμίεκτος)  / dodecaorgion (δωδεκάωργον)  / decaorgion (δεκάωργον)  / akaina (ἄκαινα)  / hexapodēs or orgya (ἑξαπόδης, ὀργυιά)  / bema or diploum (βῆμα, ἀπλοῦν)  / pous (πούς), square foot
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Ancient Roman

salt
century
geredium
uger
square akt
klima
square akt (small)
square decimpeda
square ped (ordinary)
square ped (legal)
Units: salt  / century  / geredium  / uger  / square akt  / klima  / square akt (small)  / square decimpeda  / square ped (ordinary)  / square ped (legal)
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Old French

There were many local variations; the following are Quebec and Paris definitions
arpent
royal square perche
square toise
square pied
square pouce
Units: arpent  / royal square perche  / square toise  / square pied  / square pouce
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Old Spanish

These units are occasionally used today in some Latin America countries, as well as in southern U.S. states, e.g. in Texas.
league (square)
labor
caballería
yugada
fanegada
aranzada
cuerda of Puerto Rico
celemin
cuartillo
estadal cuadrado (square estadal)
vara cuadrada (square vara)
pie cuadrado (square pie)
Units: league (square)  / labor  / caballería  / yugada  / fanegada  / aranzada  / cuerda of Puerto Rico  / celemin  / cuartillo  / estadal cuadrado (square estadal)  / vara cuadrada (square vara)  / pie cuadrado (square pie)
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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.
braça quadrada (square braça)
vara quadrada (square vara)
palmo quadrado (square palmo)
polegada quadrada (square polegada)
Units: braça quadrada (square braça)  / vara quadrada (square vara)  / palmo quadrado (square palmo)  / polegada quadrada (square polegada)
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Old Russian

desyatina (state)
desyatina (farmery)
square verst
square arshin
square foot
Units: desyatina (state)  / desyatina (farmery)  / square verst  / square arshin  / square foot

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