km² - Square Kilometer. 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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1This is a conversion chart for square kilometer (Metric). To switch the unit simply find the one you want on the page and click it.
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2Enter the value you want to convert (square kilometer). Then click the Convert Me button.
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Number of significat figures

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1234567.89none
1 234 567.89space
1,234,567.89comma
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Your value (square kilometer, km²):
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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 to hectare
square kilometer to square meter (m²)
square kilometer to square centimeter (cm²)
square kilometer to square millimeter (mm²)
Units:  / 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 kilometer to square mile
square kilometer to acre
square kilometer to square yard (yd²)
square kilometer to square foot (ft²)
square kilometer to square inch (in²)
Units: square mile  / acre  / square yard (yd²)  / square foot (ft²)  / square inch (in²)
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Ancient Greek

square kilometer to plethron (πλέθρον)
square kilometer to aroura (ἄρουρα)
square kilometer to hektos (ἕκτος)
square kilometer to hēmiektos (ἡμίεκτος)
square kilometer to dodecaorgion (δωδεκάωργον)
square kilometer to decaorgion (δεκάωργον)
square kilometer to akaina (ἄκαινα)
square kilometer to hexapodēs or orgya (ἑξαπόδης, ὀργυιά)
square kilometer to bema or diploum (βῆμα, ἀπλοῦν)
square kilometer 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 kilometer to salt
square kilometer to century
square kilometer to geredium
square kilometer to uger
square kilometer to square akt
square kilometer to klima
square kilometer to square akt (small)
square kilometer to square decimpeda
square kilometer to square ped (ordinary)
square kilometer 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 kilometer to arpent
square kilometer to royal square perche
square kilometer to square toise
square kilometer to square pied
square kilometer 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 kilometer to league (square)
square kilometer to labor
square kilometer to caballería
square kilometer to yugada
square kilometer to fanegada
square kilometer to aranzada
square kilometer to cuerda of Puerto Rico
square kilometer to celemin
square kilometer to cuartillo
square kilometer to estadal cuadrado (square estadal)
square kilometer to vara cuadrada (square vara)
square kilometer 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 kilometer to braça quadrada (square braça)
square kilometer to vara quadrada (square vara)
square kilometer to palmo quadrado (square palmo)
square kilometer 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 kilometer to desyatina (state)
square kilometer to desyatina (farmery)
square kilometer to square verst
square kilometer to square arshin
square kilometer to square foot
Units: desyatina (state)  / desyatina (farmery)  / square verst  / square arshin  / square foot

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