Acres to Square Feet Converter — ac to ft²
Instantly convert acres to square feet, square yards, square inches and square meters. The conversion is exact: 1 acre = 43,560 square feet, derived from the historic chain-and-furlong definition.
ac
1 acre = 43,560 sq ft — defined exactly as 66 ft × 660 ft (chain × furlong)
1 acre = 1 chain × 1 furlong = 66 ft × 660 ft
Multiply your acreage by the exact factor
- 1
Conversion factor
1 ac = 43,560 ft²1 chain (66 ft) × 1 furlong (660 ft) = 43,560 ft² — exact definition. - 2
Square feet
1 × 43,560 = 43,560
How does this calculator work?
Square feet = acres × 43,560. This is exact: 1 acre was defined as 1 chain (66 ft) × 1 furlong (660 ft). Other conversions: 1 acre = 4,840 sq yd, 6,272,640 sq in, 4046.86 m². No rounding — the international foot definition makes every conversion exact.
Formula
How this is calculated
The acre traces its origin to the amount of land a yoke of oxen could plough in one day. It was formalised in English law as a rectangle one chain wide (66 ft) by one furlong long (660 ft = 10 chains), giving exactly 43,560 square feet — a value that remains in force unchanged in modern US and UK law. Because both the chain and the furlong are defined through the international foot (0.3048 m exactly), the conversion is wholly exact with no rounding error: 1 acre = 43,560 sq ft, full stop.
From this single fact the other conversions follow automatically. One square yard is 9 square feet, so 1 acre = 43,560 / 9 = 4,840 sq yd (also exact). One square inch is 1/144 of a square foot, so 1 acre = 43,560 × 144 = 6,272,640 sq in. For metric, one international foot is 0.3048 m, one sq ft is 0.09290304 m², and 1 acre = 43,560 × 0.09290304 = 4,046.8564224 m² (exact to that many decimal places).
In real-estate contexts it helps to remember a few benchmarks: a standard American football field including end zones is about 1.32 acres (57,600 sq ft); a typical suburban quarter-acre lot is 10,890 sq ft; and a city block in many US grids is roughly 2–5 acres depending on the city. For large rural parcels, 640 acres make one square mile (one "section" in the US Public Land Survey System).
Frequently asked questions
Exactly 43,560 square feet. This comes from the historical definition: 1 acre = 1 chain (66 ft) × 1 furlong (660 ft). The product 66 × 660 = 43,560 and this has been the legal definition in both the US and UK for centuries.
One acre equals exactly 4,840 square yards (= 43,560 ÷ 9). A square yard is 3 ft × 3 ft = 9 sq ft.
Divide the square footage by 43,560. For a rough estimate, dividing by 44,000 is accurate to within 1%. For example, 87,120 sq ft ÷ 43,560 = exactly 2 acres.
Also known as
TG we-Calculate Editorial Team. (2026). Acres to Square Feet Converter — ac to ft² [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/acres-to-square-feet-converter
TG we-Calculate Editorial Team. "Acres to Square Feet Converter — ac to ft²." TG we-Calculate. 2026. https://we-calculate.com/calculator/acres-to-square-feet-converter.
TG we-Calculate Editorial Team, "Acres to Square Feet Converter — ac to ft²," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/acres-to-square-feet-converter
@misc{wecalculate_acres_to_square_feet_converter, title = {Acres to Square Feet Converter — ac to ft²}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/acres-to-square-feet-converter}}, year = {2026}, note = {TG we-Calculate} }
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