Acres, square feet and a lot from its sides
Acres to Square Feet Calculator
1 acre is 43,560 sq ft (4,046.86 sq m). Enter acres or square feet below; the other box follows.
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Your estimate
43,560 sq ft
1 acre × 43,560 = 43,560 sq ft.
- AcresSquare feet ÷ 43,5601 acre
- Square feetAcres × 43,56043,560 sq ft
- Square yardsSquare feet ÷ 94,840 sq yd
- Square metersSquare feet × 0.092903044,046.86 sq m
- HectaresSquare meters ÷ 10,0000.4047 ha
These are the same area in other units. A lot’s real boundary can be irregular; a rectangle is the area you measure from its sides.
How to convert acres to square feet
- Start with acres. Multiply the acres by 43,560: 1 acre × 43,560 = 43,560 sq ft.
- For a lot, multiply the length by the width in feet: 100 ft × 150 ft = 15,000 sq ft.
- Divide square feet by 43,560 to get acres: 15,000 ÷ 43,560 = 0.34 acres.
- For square yards, divide square feet by 9. An acre is 4,840 sq yd.
An acre is 43,560 square feet. That is a definition, not a measurement, so the conversion is exact: one multiplication for acres to square feet, and one division to go back. Square yards come from the same number, since a square yard is 9 sq ft.
A lot from its length and width
A rectangle’s area is its length times its width, both in feet, and the answer is in square feet. A 100 ft × 150 ft lot is 15,000 sq ft, which is 0.34 acres. A lot does not have to be square: 660 ft × 66 ft is exactly one acre, and a 100 ft × 100 ft lot is 0.23 acres. Enter the feet and inches in the lot mode above, and the drawing shows the lot to scale beside a one-acre square.
A lot with a bent edge is split into rectangles and triangles. Find the area of each part in square feet, then add them, and divide the total by 43,560 for acres.
Square meters and hectares
A foot is 0.3048 m exactly, so a square foot is 0.09290304 sq m exactly. An acre is 4,046.86 sq m. A hectare is 10,000 sq m, so an acre is 0.4047 hectares, and a hectare is about 2.47 acres.
Common acreages in square feet and square yards
| Acres | Square feet | Square yards | Side of an equal square, ft |
|---|---|---|---|
| 1/8 | 5,445 | 605 | 73.79 |
| 1/4 | 10,890 | 1,210 | 104.36 |
| 1/3 | 14,520 | 1,613.33 | 120.5 |
| 1/2 | 21,780 | 2,420 | 147.58 |
| 3/4 | 32,670 | 3,630 | 180.75 |
| 1 | 43,560 | 4,840 | 208.71 |
| 2 | 87,120 | 9,680 | 295.16 |
| 5 | 217,800 | 24,200 | 466.69 |
| 10 | 435,600 | 48,400 | 660 |
A third of an acre is 14,520 sq ft. Ten acres is 435,600 sq ft, a square 660 ft on each side.
How big an acre is
A square 208.71 ft on each side has the same area as an acre. Any rectangle whose sides multiply to 43,560 is an acre too: 330 ft × 132 ft, or 200 ft × 217.8 ft.
A square mile is 640 acres: a mile is 5,280 ft, so a square mile is 27,878,400 sq ft.
What to buy next
Once you know the area, the fence calculator for the perimeter of a lot takes its distance around, and a sod calculator for a lawn turns the same square feet into pallets of turf.
A driveway or path is a depth over that area, so use the gravel calculator for a driveway for stone and the topsoil calculator for a lawn for soil. A planting bed takes the mulch calculator for a planting bed.
Acre questions
How many square feet are in an acre?
An acre is 43,560 square feet. That is a definition: 1 acre = 43,560 sq ft, so every acreage converts with the same number.
How do I convert acres to square feet?
Multiply the acres by 43,560. 2.5 acres is 2.5 × 43,560 = 108,900 sq ft. To go the other way, divide the square feet by 43,560.
How many acres is a 100 × 100 ft lot?
A 100 ft × 100 ft lot is 10,000 sq ft, and 10,000 ÷ 43,560 = 0.23 acres. A 100 ft × 150 ft lot is 15,000 sq ft, or 0.34 acres.
How big is one acre in feet?
A square acre is 208.71 ft on each side, since √43,560 = 208.71. A rectangle works too: 660 ft × 66 ft is exactly 43,560 sq ft, one acre.
How many square yards are in an acre?
4,840 square yards, because 43,560 ÷ 9 = 4,840. The table gives the square yards for the common sizes.
How many square meters are in an acre?
4,046.86 square meters. A square foot is 0.09290304 sq m exactly, so 43,560 sq ft × 0.09290304 =4,046.86 sq m, or 0.4047 hectares.
How many acres are in a square mile?
640 acres. A mile is 5,280 ft, so a square mile is 5,280 × 5,280 = 27,878,400 sq ft, and 27,878,400 ÷ 43,560 = 640 acres.
How do I find the acres of a lot from its length and width?
Multiply the length by the width in feet to get square feet, then divide by 43,560. A 100 ft × 150 ft lot is 15,000 sq ft, which is 0.34 acres. The lot mode above does this for you.
A planning aid, not an engineering calculation: your local code and building inspector have the final word. Terms