Convert between square feet and acres in either direction, or enter a rectangular lot's length and width in feet. The result also shows square yards, square meters and hectares, plus the side length of a square lot with the same area. For room and floor area instead of land, use the square footage calculator .
Updated September 2026 · 1 acre = 43,560 square feet exactly.
Feet
Feet
| Acres | Square feet | m² | Side of a square lot |
|---|
One acre is exactly 43,560 square feet. To go from square feet to acres, divide by 43,560; to go from acres to square feet, multiply by 43,560. The 43,560 figure itself comes from two old survey units: a surveyor's chain is 66 ft and a furlong is 660 ft, and an acre was originally defined as a strip one chain wide by one furlong long — 66 × 660 = 43,560 sq ft.
10,000 sq ft of land is 0.2296 acres — a little under a quarter acre. A rectangular lot 100 ft by 200 ft covers 20,000 sq ft, which is 0.4591 acres. A quarter acre is 10,890 sq ft and a half acre is 21,780 sq ft — both exact fractions of the 43,560 figure. If a lot were a perfect square and measured exactly one acre, each side would be √43,560 ≈ 208.71 ft long.
For a rectangular lot, measure the length and width in feet (a long tape or a measuring wheel is more reliable than pacing it out) and multiply the two together, then convert the result to acres above. An irregular lot can usually be split into two or more rectangles or triangles, each measured and calculated separately and then added — the same approach the square footage calculator uses for rooms. Where precision matters — a boundary dispute, a subdivision, a loan application — the recorded survey or plat figure for the parcel is the authoritative number, not a tape measurement.
The same 10,000 sq ft example above is also 1,111.11 sq yd and 929.03 m². For metric land measurements, a hectare is 107,639.1 sq ft, which works out to 2.4711 acres — so one hectare is a bit less than two and a half acres. The metrics card above converts whatever you enter into square yards, square meters and hectares at the same time.
A quick lookup in the other direction — common square-footage figures converted to acres, square meters and the side of an equivalent square lot.
| Square feet | Acres | m² |
|---|---|---|
| 2,500 | 0.0574 | 232.26 |
| 5,000 | 0.1148 | 464.52 |
| 7,500 | 0.1722 | 696.77 |
| 10,000 | 0.2296 | 929.03 |
| 15,000 | 0.3444 | 1,393.55 |
| 20,000 | 0.4591 | 1,858.06 |
| 43,560 | 1.0000 | 4,046.86 |
| 87,120 | 2.0000 | 8,093.71 |
| 100,000 | 2.2957 | 9,290.3 |
A quarter acre is 10,890 sq ft (¼ × 43,560). A square lot that size would run about 104.36 ft on each side.
Half an acre is 21,780 sq ft (½ × 43,560), or a square lot about 147.58 ft on a side.
One acre is exactly 43,560 square feet — the same as a rectangle 66 ft by 660 ft (a surveyor's chain by a furlong), or a square about 208.71 ft on each side. In other units that's 4,840 sq yd or 4,046.86 m².
10,000 sq ft is 0.2296 acres — a little under a quarter acre. A square lot with that area is about 100 ft on a side.
Not quite. An American football field including both end zones is 360 ft × 160 ft = 57,600 sq ft, which is 1.3223 acres — about 1.3 acres, so a full field (with end zones) is bigger than one acre.