Acres to Square Feet Converter
Convert acres to square feet and back — exactly 43,560 sq ft per acre. Free, instant, no sign-up, full working shown.
Convert acres ⇄ square feet
43560 sq ft
1 ac = 43560 sq ft (1 ac = 43,560 sq ft (exact))
Formula: 1 ac × 43560 = 43560 sq ft
How the acres to square feet converter conversion works
The converter applies sq ft = acres × 43,560. The acre is defined as exactly 43,560 sq ft, so the conversion is exact in both directions. Going the other way, acres = sq ft ÷ 43,560.
Worked example: a half-acre plot is 0.5 × 43,560 = 21,780 sq ft, and a quarter-acre lot is 10,890 sq ft.
For the same land in metric, use our acres to hectares converter or acres to square meters converter.
acres to square feet converter questions
How many square feet are in an acre?
Exactly 43,560 sq ft. This is the definition of the acre in both the US and the UK.
How do I convert acres to square feet?
Multiply by 43,560: sq ft = acres × 43,560. So 2.5 acres is 2.5 × 43,560 = 108,900 sq ft.
How do I convert square feet back to acres?
Divide by 43,560: acres = sq ft ÷ 43,560. So 87,120 sq ft is 2 acres.
Why 43,560?
An acre was defined as one chain by one furlong: 66 ft × 660 ft = 43,560 sq ft — the surveyor's rectangle that stuck.
How big is a quarter-acre lot?
0.25 × 43,560 = 10,890 sq ft — the classic US suburban building plot.
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Sources & official guidance
Estimate only — the acre is exactly 43,560 sq ft by definition. See our disclaimer.