Acres to Square Feet Converter
One acre is exactly 43,560 square feet. Enter an acreage value to see the square-foot equivalent, or paste a square-foot lot size to calculate the decimal acre. The conversion is especially handy when US real estate, farm, appraisal or zoning documents mix both units.
How to convert acres and square feet
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1
Enter the land area
Type the acreage, such as 0.25 for a quarter-acre lot or 2.5 for a small rural parcel.
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2
Use the exact factor
The calculator multiplies acres by 43,560 to produce square feet.
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3
Reverse the calculation
Switch direction and divide square feet by 43,560 to get acres from a deed, plat or appraisal.
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4
Compare listings consistently
Use one unit when reviewing lots, setbacks, buildable area, tax records or contractor estimates.
Why 43,560?
The acre comes from older English land measurement. A traditional strip of land was 1 chain wide (66 ft) and 1 furlong long (660 ft), so 66 x 660 = 43,560 square feet. That historical definition is still the exact conversion used for modern land records.
Reference table
| Acres | Square feet | Metric sense check | Common context |
|---|---|---|---|
| 0.10 | 4,356 | about 405 m² | compact city or infill lot |
| 0.25 | 10,890 | about 1,012 m² | quarter-acre home lot |
| 0.50 | 21,780 | about 2,023 m² | large residential parcel |
| 1 | 43,560 | about 4,047 m² | one acre |
| 2 | 87,120 | about 0.81 ha | small rural holding |
| 5 | 217,800 | about 2.02 ha | hobby farm or paddock |
| 10 | 435,600 | about 4.05 ha | estate, field or development site |
Practical checks
- Lot size: US listings often use square feet for smaller residential lots and acres for larger parcels.
- Buildable area: setbacks, easements and access strips can reduce usable land, so convert the parcel first and then apply local planning limits.
- Survey precision: legal descriptions may round acres to three decimals, while square feet are often shown as whole numbers. Small differences usually come from rounding.
- Metric comparison: 1 acre is about 4,046.856 m², so 10,000 m² is about 2.471 acres.
Not to be confused with
- Square yard: 1 acre = 4,840 square yards.
- Square metre: 1 acre = 4,046.856 m².
- Hectare: 1 acre = 0.404686 ha, and 1 hectare = 2.47105 acres.
Frequently Asked Questions
Half an acre is exactly 21,780 square feet. If it were a perfect square, each side would be about 147.58 ft.
Divide the square-foot value by 43,560. For example, 8,400 sq ft / 43,560 = 0.1928 acres, which is usually rounded to 0.193 acres.
For normal real-estate work, no. Both are treated as 43,560 sq ft. The old US survey foot creates a tiny difference, far below ordinary lot-measurement tolerance.
A square with an area of one acre has sides of about 208.71 ft, because the square root of 43,560 is about 208.71.
Yes. Lot size means the whole parcel boundary shown on the plat or deed. Building floor area, usable yard area and buildable footprint are separate measurements.
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