Acres to Square Feet Calculator
Type acres or a lot's sizes; get square feet, yards, meters and hectares.
Sources checked 9 November 2026
Acres to square feet calculator
How many square feet is an acre
One acre is exactly 43,560 square feet. To convert acres to square feet, multiply the acres by 43,560; to convert square feet to acres, divide by 43,560. A quarter acre is 10,890 square feet and half an acre 21,780 square feet. The same acre is 4,840 square yards, 4,046.86 square meters or 0.4047 hectare.
The calculator works both ways. Type acres in the first piece for the square feet, or pick Known area and type square feet for the acres. A lot measured in feet goes in as a rectangle, triangle or trapezoid, and the calculator works out the acreage from the square footage.
Area of each piece
- 1 × 43,560 = 43,560.00 sq ft
Convert
43,560.00 ÷ 43,560 = 1.0000 acres; 43,560.00 × 0.0929 = 4,046.86 m² = 0.4047 hectares
Square feet = acres × 43,560
1 × 43,560 = 43,560.00 sq ft = 1.0000 acres
All sizes in feet.
How big is an acre of land
An acre of land is roughly 76% of an American football field. The NFL rules set the field, end zones included, at 360 by 160 feet: 57,600 square feet, or 1.32 acres. A plot 200 by 200 feet is often taken for an acre, but it is 40,000 square feet, 0.92 acre: 3,560 square feet smaller.
Real estate listings and land for sale give lot sizes in acres, and a house lot is usually a fraction of one; the table below turns quarter, third and half acres into square feet. Larger acres of land are counted against the square mile: 1 square mile holds 640 acres.
The acre is old. Britannica traces it to the area a yoke of oxen pulling a wooden plow could work in one day. Today it is fixed in feet: NIST lists it as 43,560 square feet, or 10 square chains.
Acres to square feet: common lot sizes
Lots are listed in fractions of an acre. The last column is the side of a square of that size; a real lot is seldom square, but the side gives a picture of it. An acre as a square is about 208.71 ft on a side.
| Acres | Square feet | Square yards | Square meters | Side of a square |
|---|---|---|---|---|
| 1/8 acres | 5,445 | 605 | 506 | 73.8 ft |
| 1/4 acres | 10,890 | 1,210 | 1,012 | 104.4 ft |
| 1/3 acres | 14,520 | 1,613 | 1,349 | 120.5 ft |
| 1/2 acres | 21,780 | 2,420 | 2,023 | 147.6 ft |
| 3/4 acres | 32,670 | 3,630 | 3,035 | 180.7 ft |
| 1 acre | 43,560 | 4,840 | 4,047 | 208.7 ft |
| 2 acres | 87,120 | 9,680 | 8,094 | 295.2 ft |
| 5 acres | 217,800 | 24,200 | 20,234 | 466.7 ft |
| 10 acres | 435,600 | 48,400 | 40,469 | 660.0 ft |
Worked out: acres × 43,560; ÷ 9 for square yards; × 0.09290304 for square meters. A real lot is seldom square: the side is only a picture of the size.
Square feet to acres
Divide the square feet by 43,560. A 10,000 square feet lot is 0.23 acre, and a 5,000 square feet city lot is 0.115 acre.
| Square feet | Acres |
|---|---|
| 5,000 | 0.1148 |
| 7,500 | 0.1722 |
| 10,000 | 0.2296 |
| 20,000 | 0.4591 |
| 43,560 | 1 |
| 100,000 | 2.2957 |
Worked out: square feet ÷ 43,560.
An acre in square yards, meters, hectares and miles
An acre has no set shape: it is any area of 43,560 square feet. A square mile holds 640 acres, or 27,878,400 square feet, and one hectare is 2.471 acres.
| One acre | Equals |
|---|---|
| Square feet | 43,560 |
| Square yards | 4,840 |
| Square meters | 4,046.8564 |
| Hectares | 0.404686 |
| Square miles | 1/640 = 0.001563 |
Exact by definition: 1 acre = 43,560 sq ft; 1 sq ft = 0.09290304 m²; 1 ha = 10,000 m² (NIST Handbook 44, Appendix C).
Since 2023 every US foot is the international foot of 0.3048 m, so the acre is now defined in international feet. The old survey acre differed by less than a fifth of a square foot.
Acres to square feet FAQ
How many square feet are in 1 acre?
43,560, exactly.
How many feet is an acre?
An acre is an area, not a length. As a square it measures about 208.71 ft on each side; any other shape of the same area is an acre too.
How many acres are in a square mile?
640.
How do I calculate acreage from square footage?
Divide the square feet by 43,560. For a lot of any shape, measure it in pieces in the square footage calculator, or type the sides here.
Is 200 ft by 200 ft 1 acre?
No. It is 40,000 square feet, 0.92 acre, roughly 3,560 square feet smaller than an acre.
How big is an acre compared to a football field?
An NFL field with its end zones is 1.32 acres, so an acre is roughly 76% of it.
How many square feet is 2 acres?
87,120 square feet. Five acres are 217,800 square feet.
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Sources
The unit definitions on this page come from these documents, checked 9 November 2026.
- NIST Handbook 44 (2026), Appendix C, General Tables of Units of Measurement
- Federal Register 85 FR 62698, Deprecation of the United States Survey Foot, October 2020
- NFL, 2024 Official Playing Rules of the National Football League, Rule 1, Section 1
- Encyclopaedia Britannica, acre (unit of measurement)