Ans

Unit converter

Acres to square feet.

Convert ac to ft² and ft² to ac. Type in either box and the other follows. An acre is 43 560 square feet, a number that looks arbitrary because it is: it is 66 feet by 660 feet, one chain by one furlong.

ac → ft²Exact definition
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Acres to square feet — common values, to 6 significant figures.
acft²
0.1 ac4356 ft²
0.25 ac10890 ft²
0.5 ac21780 ft²
1 ac43560 ft²
2 ac87120 ft²
3 ac130680 ft²
5 ac217800 ft²
10 ac435600 ft²
20 ac871200 ft²
1 ac=43560 ft² 1 ft²=2.295684114×10⁻⁵ ac

Definitions

  • The acre is 4046.856 4224 m², historically the area one ox team could plough in a day. There are 640 acres in a square mile.
  • The square foot is 0.092 903 04 m² exactly. US property listings and commercial UK lettings still quote it.
  • This conversion is exact by definition. 1 ac = 43560 ft².
  • Area is converted through m².

How it works

One direction multiplies and the other divides by the same number, so nothing is lost by going back and forth.

The value passes through m², the unit every other area unit on the site is defined against, rather than a number written into this page on its own. That is why the figure here, the figure in the table above and the general area converter always agree.

Display precision limits significant figures rather than decimal places, because one fixed number of decimals is useless across a range this wide. Very large and very small results switch to scientific notation with a proper superscript exponent. The editable box always holds a plain number at full working precision, so you can carry on from either side.

Common questions this answers: how many square feet in an acre (43560), how many acres in a square foot (2.29568×10⁻⁵), and what 1 ac is in square feet (43560 ft²).

From the maker of Ans — a scientific calculator you can own. Same idea: a proper instrument, nothing in the way.