The square metre (also spelled meter, see spelling differences) is the SI derived unit of area, with symbol m². It is defined as the area of a square whose sides measure exactly one metre. The square metre is derived from the SI base unit of the metre, which in turn is defined as the length of the path travelled by light in absolute vacuum during a time interval of 1⁄299,792,458 of a second.

Metric

• Square kilometre (km²)

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• Hectare (ha)

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• Are (a)

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• Square metre (m²)

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• Square decimetre (dm²)

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• Square centimetre (cm²)

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• Square millimetre (mm²)

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• Square micrometre (µm²)

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• Square nanometre (nm²)

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British/American

• Township

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• Square mile

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• Homestead

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• Acre

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• Rood

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• Square rod

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• Square

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• Square yard (yr²)

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• Square foot (ft²)

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• Square inch (in²)

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Japanese

• Tsubo

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• Cho

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• Tann

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• Se

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Other

• Metric dunam

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• Cypriot dunam

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• Iraqi dunam

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• Football pitch

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Brazilian

• Alqueire paulista

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• Alqueire mineiro

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• Alqueire baiano

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• Alqueire do norte

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