Acres to Square Feet (ac to ft²)
An acre is exactly 43,560 square feet. The number comes from the old surveying units: one furlong (660 ft) by one chain (66 ft) is 660 × 66 = 43,560 sq ft. In metric terms that is 4,046.8564224 m² (NIST SP 811), so multiply acres by 43,560 for square feet.
Formula
square feet = acres × 43,560
Example: 0.25 acres = 10,890 square feet.
Acres to Square Feet chart
| acres | square feet |
|---|---|
| 0.1 | 4,356 |
| 0.125 | 5,445 |
| 0.2 | 8,712 |
| 0.25 | 10,890 |
| 0.33 | 14,374.8 |
| 0.5 | 21,780 |
| 0.75 | 32,670 |
| 1 | 43,560 |
| 1.5 | 65,340 |
| 2 | 87,120 |
| 2.5 | 108,900 |
| 5 | 217,800 |
| 10 | 435,600 |
| 20 | 871,200 |
| 100 | 4,356,000 |
Good to know
Lot sizes are the everyday case. A quarter-acre lot is 10,890 sq ft — for example about 99 × 110 ft — and a half acre is 21,780 sq ft. A square one-acre plot is about 208.7 ft on each side (√43,560).
An American football field from goal line to goal line is 300 × 160 ft = 48,000 sq ft, or 1.10 acres; with both end zones it is 360 × 160 ft = 57,600 sq ft, or 1.32 acres. One square mile is 640 acres, and one hectare (10,000 m²) is 2.47105 acres.
Frequently asked questions
How many square feet are in an acre?
Exactly 43,560 square feet.
How many square feet is half an acre?
Half an acre is 21,780 square feet; a quarter acre is 10,890 square feet.
How big is an acre on each side?
A square acre is about 208.71 ft on each side, since √43,560 ≈ 208.71.