How Many Square Feet in an Acre? Lot Size Chart and Conversions
An acre is 43,560 square feet. Divide the area of a lot in square feet by 43,560 to get acres: a lot 200 × 150 ft is 30,000 square feet, or 0.689 acres. The acreage calculator also handles triangles and circles.
Lot sizes in acres
| Lot | Square feet | Acres | Hectares |
|---|---|---|---|
| 50 × 100 ft | 5,000 | 0.115 | 0.046 |
| 75 × 120 ft | 9,000 | 0.207 | 0.084 |
| 100 × 100 ft | 10,000 | 0.230 | 0.093 |
| 100 × 150 ft | 15,000 | 0.344 | 0.139 |
| 150 × 200 ft | 30,000 | 0.689 | 0.279 |
| 200 × 218 ft | 43,600 | 1.001 | 0.405 |
| 300 × 300 ft | 90,000 | 2.066 | 0.836 |
| 330 × 660 ft | 217,800 | 5.000 | 2.023 |
What a fraction of an acre looks like
The side of a square lot of each size, and the area in square meters:
| Size | Square feet | Side of a square | Square meters |
|---|---|---|---|
| 1/8 acre | 5,445 | 74 × 74 ft | 506 |
| 1/4 acre | 10,890 | 104 × 104 ft | 1,012 |
| 1/2 acre | 21,780 | 148 × 148 ft | 2,023 |
| 1 acre | 43,560 | 209 × 209 ft | 4,047 |
| 2 acres | 87,120 | 295 × 295 ft | 8,094 |
| 4 acres | 174,240 | 417 × 417 ft | 16,187 |
Converting area
| To convert | Multiply by |
|---|---|
| Acres to square feet | 43,560 |
| Square feet to acres | 0.0000230579 (or divide by 43,560) |
| Acres to hectares | 0.404686 |
| Hectares to acres | 2.47105 |
| Acres to square meters | 4,046.86 |
| Square yards to acres | Divide by 4,840 |
Measuring a lot that is not a rectangle
- Split it into rectangles and triangles, work out each area, and add them up.
- For a triangle, the area is half the base times the height, measured at right angles.
- For the legal area, use the deed or the survey. Measurements on the ground can be off.
- A measuring wheel or a laser distance measure is faster than a tape for long distances.
Working with the area
Lawn seed, fertilizer and herbicide are all dosed by the area: use the grass seed calculator and the lawn fertilizer calculator with your area in square feet. Estimates only.
Frequently asked questions
How many square feet are in an acre?
43,560. A square acre is about 208.7 feet on each side.
How many acres is a 200 x 150 ft lot?
0.689 acres: 200 × 150 = 30,000 square feet, divided by 43,560.
How big is a quarter acre?
10,890 square feet, about 104 by 104 feet.
How many hectares are in an acre?
About 0.4047 hectares. One hectare is 2.471 acres. A 30,000 ft² lot is 0.279 hectares.
How many acres is a football field?
A football field of 100 yards (300 ft) by 160 ft is 48,000 square feet, about 1.1 acres without the end zones.
More guides
Tools & materials for this project
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Estimates only. Quantities depend on your materials, site and supplier. Confirm important numbers before you order, and follow local building codes for anything structural.