mm² - Square Millimeter. Conversion Chart

This converter features contemporary units of area. There is also a special converter for historical units of area you might want to visit for ancient, medieval and other old units that are no longer used.
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1This is a conversion chart for square millimeter (Metric). 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 (square millimeter). 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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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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Your value (square millimeter, mm²):
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Metric

square millimeter to square kilometer (km²)
square millimeter to hectare
square millimeter to decare
square millimeter to are (a)
square millimeter to square meter (m²)
square millimeter to square decimeter (dm²)
square millimeter to square centimeter (cm²)
square millimeter to barn (b)
Units: square kilometer (km²)  / hectare  / decare  / are (a)  / square meter (m²)  / square decimeter (dm²)  / square centimeter (cm²)  /  / barn (b)
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British (Imperial) And U.S. System

square millimeter to township
square millimeter to square mile
square millimeter to homestead
square millimeter to acre
square millimeter to rood
square millimeter to square rod
square millimeter to perch
square millimeter to square yard (yd²)
square millimeter to square foot (ft²)
square millimeter to square inch (in²)
square millimeter to square mil (th²)
Units: township  / square mile  / homestead  / acre  / rood  / square rod  / perch  / square yard (yd²)  / square foot (ft²)  / square inch (in²)  / square mil (th²)
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Historical Units Still In Use Today

Some older units managed to survive and are still used nowadays. They were rounded up in accordance to current measurements (either metric or imperial) while keeping their old names. For each of the units below we specify the country where it is in use.
square millimeter to dulum (дулум) of Bosnia and Herzegovina and Serbia
square millimeter to dynym or dylym of Albania
square millimeter to donum of Cyprus
square millimeter to skales (σκάλες) of Cyprus
square millimeter to stremma (στρέμμα) of Greece
square millimeter to Turkish stremma of Greece
square millimeter to dunam of Iraq
square millimeter to dunam (dönüm, دونم) of Turkey, Syria, Israel, Palestine, Jordan, Lebanon
square millimeter to old (pre 1928) dunam (dönüm, دونم) of Turkey, Syria, Israel, Palestine, Jordan, Lebanon
square millimeter to feddan (فدّان‎) of Egypt, Sudan, Syria, Sultanate of Oman
square millimeter to kirat (قيراط) of Egypt
square millimeter to manzana of Argentina
square millimeter to manzana of Belize
square millimeter to manzana of Costa Rica
square millimeter to manzana of Guatemala
square millimeter to manzana of Honduras
square millimeter to manzana of Nicaragua
square millimeter to cuadra of Argentina
square millimeter to cuadra of Chile
square millimeter to cuadra of Ecuador
square millimeter to cuadra of Paraguay
square millimeter to cuadra of Peru
square millimeter to cuadra of Uruguay
square millimeter to square vara of Panama and Columbia
square millimeter to square vara of Chile, Costa Rica, Dominican Republic, Ecuador, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Peru, São Tomé and Principe, Venezuela
square millimeter to square vara of Cuba
square millimeter to square vara of Argentina, Paraguay, Uruguay
square millimeter to square vara of Brazil
Units: dulum (дулум) of Bosnia and Herzegovina and Serbia  / dynym or dylym of Albania  / donum of Cyprus  / skales (σκάλες) of Cyprus  / stremma (στρέμμα) of Greece  / Turkish stremma of Greece  / dunam of Iraq  / dunam (dönüm, دونم) of Turkey, Syria, Israel, Palestine, Jordan, Lebanon  / old (pre 1928) dunam (dönüm, دونم) of Turkey, Syria, Israel, Palestine, Jordan, Lebanon  / feddan (فدّان‎) of Egypt, Sudan, Syria, Sultanate of Oman  / kirat (قيراط) of Egypt  / manzana of Argentina  / manzana of Belize  / manzana of Costa Rica  / manzana of Guatemala  / manzana of Honduras  / manzana of Nicaragua  / cuadra of Argentina  / cuadra of Chile  / cuadra of Ecuador  / cuadra of Paraguay  / cuadra of Peru  / cuadra of Uruguay  / square vara of Panama and Columbia  / square vara of Chile, Costa Rica, Dominican Republic, Ecuador, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Peru, São Tomé and Principe, Venezuela  / square vara of Cuba  / square vara of Argentina, Paraguay, Uruguay  / square vara of Brazil
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Units for Measuring Wire Gauges

These units are referring to the area of a wire with a circular cross section. One circular mil denote an area, equal to the area of a circle with a diameter of one mil.

You can find a comprehensive list of wire gauge units on our special wire gauge conversion page.

square millimeter to circular inch
square millimeter to thousand of circular mils (kcmil, MCM)
square millimeter to circular mil (cmil)
Units: circular inch  / thousand of circular mils (kcmil, MCM)  / circular mil (cmil)
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Japanese

square millimeter to shaku (勺)
square millimeter to go (合)
square millimeter to jo (畳)
square millimeter to tsubo (坪)
square millimeter to bu (歩)
square millimeter to se (畝)
square millimeter to tan (段, 反)
square millimeter to cho (町, 町歩)
Units: shaku (勺)  / go (合)  / jo (畳)  / tsubo (坪)  / bu (歩)  / se (畝)  / tan (段, 反)  / cho (町, 町歩)
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Chinese units of 1930

square millimeter to qing (頃 or 顷)
square millimeter to mu (畝 or 亩)
square millimeter to fen (市分)
square millimeter to fang zhang (方丈) (zhang²)
square millimeter to li (釐 or 厘)
square millimeter to hao (毫)
square millimeter to fang chi (方尺) (chi²)
square millimeter to fang cun (方寸) (cun²)
Units: qing (頃 or 顷)  / mu (畝 or 亩)  / fen (市分)  / fang zhang (方丈) (zhang²)  / li (釐 or 厘)  / hao (毫)  / fang chi (方尺) (chi²)  / fang cun (方寸) (cun²)
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Chinese units of 1915

square millimeter to qing (頃 or 顷)
square millimeter to mu (畝 or 亩)
square millimeter to fen (分)
square millimeter to fang zhang (方丈) (zhang²)
square millimeter to li (釐 or 厘)
square millimeter to hao (毫)
square millimeter to fang chi (方尺) (chi²)
square millimeter to fang cun (方寸) (cun²)
Units: qing (頃 or 顷)  / mu (畝 or 亩)  / fen (分)  / fang zhang (方丈) (zhang²)  / li (釐 or 厘)  / hao (毫)  / fang chi (方尺) (chi²)  / fang cun (方寸) (cun²)
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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.
square millimeter to rai (ไร่)
square millimeter to ngan (งาน)
square millimeter to tarang wah (ตารางวา, square wa)
Units: rai (ไร่)  / ngan (งาน)  / tarang wah (ตารางวา, square wa)
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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.
square millimeter to Planck area (L²)
Units: Planck area (L²)

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