Square Feet to Acres Calculator
Convert between square feet and acres. 1 acre = 43,560 square feet. Useful for property listings, lot sizing, and land valuation.
Square Feet ⇌ Acres Converter
The conversion factor
1 acre = 43,560 square feet, exactly. This number comes from historic measurement: an acre was originally a chain (66 ft) by a furlong (660 ft) = 43,560 sq ft.
To convert sq ft → acres: divide by 43,560. To convert acres → sq ft: multiply by 43,560.
Common lot sizes
0.10 acre = 4,356 sq ft (small urban lot). 0.25 acre = 10,890 sq ft (typical suburban quarter-acre). 0.50 acre = 21,780 sq ft (larger suburban). 1 acre = 43,560 sq ft. 2 acres = 87,120 sq ft. 5 acres = 217,800 sq ft. 10 acres = 435,600 sq ft.
For reference: a US football field (100 yd × 53.3 yd, including end zones at 120 × 53.3 yd) is about 1.32 acres or 57,600 sq ft.
Pro tips
Real estate rounds heavily
A "0.25 acre lot" might be 0.247 (10,762 sq ft) or 0.253 (11,021 sq ft). Use the actual figure from the plat or deed for any calculation that matters.
Don't confuse with hectares
1 hectare = 10,000 sq m = 107,639 sq ft = 2.47 acres. Hectares are the metric standard for land area outside the US.
Sections and acres
A "section" of land in US public land surveying is 1 mile × 1 mile = 640 acres = 27,878,400 sq ft.
Use the calculator above for irregular lots
For irregular property shapes, use the multi-segment calculator to sum up rectangles. The result panel shows acres automatically.