Square Feet to Acres Converter
Divide an area in square feet by 43560 to get acres. 21780 ft² = 0.5 ac, and 87120 ft² = 2 ac.
Small lots and building footprints are usually measured in square feet, and larger land in acres, so this conversion comes up when comparing the two.
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(opens in a new tab)How to convert square feet to acres
Formula: acres = square feet / 43560
The constant is exact by definition: 1 acre = 43560 square feet. It is not a rounded approximation.
Because an acre is exactly 43560 square feet, multiples of 21,780 ft² (half an acre) convert to tidy acre figures. Other areas usually give a long decimal, rounded here to 12 significant digits.
Worked example: 10000 ft² to acres
The answer below is shown to 12 significant digits. The full value has more digits, so treat the displayed figure as rounded.
Convert 10000 ft²
Input
10000 ft²
Output
10000 / 43560 = 0.229568411387 ac
Common square feet to acres conversions
| Square feet (ft²) | Acres (ac) |
|---|---|
| 1000 ft² | 0.0229568411387 ac |
| 5000 ft² | 0.114784205693 ac |
| 10000 ft² | 0.229568411387 ac |
| 21780 ft² | 0.5 ac |
| 43560 ft² | 1 ac |
| 87120 ft² | 2 ac |
| 217800 ft² | 5 ac |
When you need to convert square feet to acres
- Lot sizes listed in square feet, compared with land listed in acres.
- Checking how much of an acre a house, a barn or a parking area covers.
- Garden, farm and site areas measured in square feet.
- Sports grounds: a US football field including the end zones is 360 by 160 feet, which is 57,600 ft², and 57600 ft² = 1.32231404959 ac.
Things worth knowing
- The international acre is used here. The US survey acre, found in some older land records, differs by about four parts per million and is not converted.
- This page converts area only. It does not give planning, zoning or valuation advice for a property.
Converting back and related converters
To go the other way, use the Acres to Square Feet Converter, which applies square feet = acres × 43560. For any other pair of units, open the Unit Converter, or browse every unit converter.
- Square Feet to Square Meters Converter: to convert the same area to square meters.
- Square Meters to Square Feet Converter: for metric areas you want in square feet first.
Frequently asked questions
How many acres is 10,000 square feet?
10000 ft² = 0.229568411387 ac, a little under a quarter of an acre.
How many square feet make half an acre?
21,780 square feet, because the acre is exactly 43560 square feet: 21780 ft² = 0.5 ac.
How many acres is a football field?
A US football field including the end zones is 57,600 square feet, which is 1.32231404959 ac. Without the end zones it is 48,000 square feet, or 1.10192837466 ac.
Can I convert square meters to acres here?
Not on this page. Convert to square feet first with the Square Meters to Square Feet Converter, or use the Unit Converter to go from square meters to acres directly.