mm² - Square Millimeter. 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 area that are used today, including many national units of various countries, please switch to our main area conversion page.
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Your value (square millimeter, mm²):
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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 millimeter to square kilometer (km²)
square millimeter to hectare
square millimeter to square meter (m²)
square millimeter to square centimeter (cm²)
Units: square kilometer (km²)  / hectare  / square meter (m²)  / square centimeter (cm²)  /
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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 millimeter to square mile
square millimeter to acre
square millimeter to square yard (yd²)
square millimeter to square foot (ft²)
square millimeter to square inch (in²)
Units: square mile  / acre  / square yard (yd²)  / square foot (ft²)  / square inch (in²)
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Ancient Greek

square millimeter to plethron (πλέθρον)
square millimeter to aroura (ἄρουρα)
square millimeter to hektos (ἕκτος)
square millimeter to hēmiektos (ἡμίεκτος)
square millimeter to dodecaorgion (δωδεκάωργον)
square millimeter to decaorgion (δεκάωργον)
square millimeter to akaina (ἄκαινα)
square millimeter to hexapodēs or orgya (ἑξαπόδης, ὀργυιά)
square millimeter to bema or diploum (βῆμα, ἀπλοῦν)
square millimeter to 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

square millimeter to salt
square millimeter to century
square millimeter to geredium
square millimeter to uger
square millimeter to square akt
square millimeter to klima
square millimeter to square akt (small)
square millimeter to square decimpeda
square millimeter to square ped (ordinary)
square millimeter to 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
square millimeter to arpent
square millimeter to royal square perche
square millimeter to square toise
square millimeter to square pied
square millimeter to 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.
square millimeter to league (square)
square millimeter to labor
square millimeter to caballería
square millimeter to yugada
square millimeter to fanegada
square millimeter to aranzada
square millimeter to cuerda of Puerto Rico
square millimeter to celemin
square millimeter to cuartillo
square millimeter to estadal cuadrado (square estadal)
square millimeter to vara cuadrada (square vara)
square millimeter to 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.
square millimeter to braça quadrada (square braça)
square millimeter to vara quadrada (square vara)
square millimeter to palmo quadrado (square palmo)
square millimeter to 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

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

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