Full name: acre
Plural form: acres
Category type: area
Scale factor: 4046.8564224
The SI derived unit for area is the square meter.
1 square meter is equal to 0.000247105381467 acre.
Valid units must be of the area type.
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An acre is a measure of land area in Imperial units or U.S. customary units. It is equal to 43 560 square feet, 4840 square yards, or 160 square rods. The precise meaning of this depends on the exact definition adopted for a foot: the international acre is 4 046.856 422 4 m² (for the UK, see). For measurements based specifically on the US survey foot the US survey acre is ca. 4 046.872 610 m².