area · UK / US · Modern / historical

square mile

mi²exact

Definition

1 mi² = exactly 2,589,988.110336 m².

One square mile is equal to 2,590,000 square metres.

Derived exactly from the international mile.

Current-use record in the project inventory; exact scope should follow the definition and regional/system context shown here.

One square mile contains 640 acres.

Source tier Tier A · confidence High

area · International · Modern

Non-SI unit accepted for use with the SI; 1 ha = 10⁴ m².

m²

area · International · Modern

Coherent SI derived unit for area, equal to metre squared.

area · UK / US · Modern / historical

1 acre = 43,560 ft² = exactly 4046.8564224 m² using the international foot.

ft²

area · UK / US · Modern / historical

1 ft² = exactly 0.09290304 m².

yd²

area · UK / US · Modern / historical

1 yd² = exactly 0.83612736 m².

km²

area · International · Modern

1 km² = exactly 10^6 m².

in²

area · US / UK · Modern

1 in² = exactly 0.00064516 m².

area · South Asia · Historical–modern

Government gazetteers document bighas of different areas even within districts; Rohtak government bigha was 5/8 acre.

variant