Acre to Square Foot Converter (ac to ft²)
1 acre equals 43,560 square feet — multiply the number of acres by 43,560 to convert. This is a fixed, exact figure that comes straight from the historical definition of the acre, so it never changes.
The formula
To convert acres to square feet, multiply by 43,560:
square feet = acres × 43560
For example, 10 ac × 43560 = 435,600 ft². To reverse it, divide by 43,560.
Conversion table
| Acres (ac) | Square feet (ft²) |
|---|---|
| 1 | 43,560 |
| 2 | 87,120 |
| 3 | 130,680 |
| 5 | 217,800 |
| 10 | 435,600 |
| 25 | 1,089,000 |
| 50 | 2,178,000 |
| 100 | 4,356,000 |
| 500 | 21,780,000 |
| 1000 | 43,560,000 |
How to convert online
- Type the number of acres into the first box.
- Read the square-foot value instantly in the second box.
- Enter a square-foot value to convert back to acres — it works both ways.
Use the Acre to Square Foot Converter — free and instant in your browser.
Where this conversion is used
Real estate, construction and land development often price and plan in square feet while parcels are recorded in acres. Converting lets you compare a building footprint to a lot size, estimate landscaping or paving quantities, and check plot descriptions in listings that quote both units.
FAQ
How many square feet are in an acre?
Exactly 43,560 square feet. So 2 acres is 87,120 ft² and 100 acres is 4,356,000 ft².
How do I convert square feet back to acres?
Divide by 43,560. For example, 43,560 ft² is exactly 1 acre and 87,120 ft² is 2 acres.
Is the conversion exact?
Yes. An acre is defined as 43,560 square feet exactly, so there is no rounding involved.
Is this converter free and private?
Yes. It runs entirely in your browser — nothing is uploaded or stored. It is free, needs no sign-up and works offline once loaded.
Related converters
- Square Foot to Acre Converter
- Acre to Square Meter Converter
- Acre to Square Yard Converter
- Acre to Hectare Converter
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