Calculate square feet from acres, or acres from square feet, in one step. One acre equals 43,560 square feet, plus hectares, square meters, and more.
Acres to Square Feet Formula
An acre is a fixed unit of land area, and it always equals the same number of square feet. To go from acres to square feet, multiply by 43,560:
SF = A * 43560
To go the other way, from square feet back to acres, divide by 43,560:
A = SF / 43560
Where:
- A = area in acres (ac)
- SF = area in square feet (sq ft)
- 43,560 = the number of square feet in one acre
The converter has two modes. In the acres to square feet mode you enter a value in acres and it multiplies by 43,560. In the square feet to acres mode you enter a value in square feet and it divides by 43,560. Turning on the more units option also reports the same area in square yards, square meters, hectares, square miles, and square kilometers, and lets you set how many decimal places the results use.
Common Acre and Square Foot Conversions
Because one acre is a large, uneven number of square feet, it helps to see the values for common plot sizes. Use this table for quick reference or to check the calculator.
| Acres | Square Feet |
|---|---|
| 0.25 ac | 10,890 sq ft |
| 0.5 ac | 21,780 sq ft |
| 1 ac | 43,560 sq ft |
| 2 ac | 87,120 sq ft |
| 5 ac | 217,800 sq ft |
| 10 ac | 435,600 sq ft |
One acre also lines up with these other area units, which the calculator can show when you turn on more units.
| Unit | Value of 1 Acre |
|---|---|
| Square feet | 43,560 sq ft |
| Square yards | 4,840 sq yd |
| Square meters | 4,046.86 m2 |
| Hectares | 0.4047 ha |
| Square miles | 0.0015625 sq mi |
Example Problems
Example 1: Acres to square feet. You have a 2.5 acre lot and want its size in square feet. Multiply by 43,560: 2.5 x 43,560 = 108,900 square feet.
Example 2: Square feet to acres. A parcel is listed as 30,000 square feet. Divide by 43,560: 30,000 / 43,560 = 0.6887 acres, or about 0.69 acres.
FAQ
How many square feet are in an acre? One acre is exactly 43,560 square feet. This is a fixed definition, so the number never changes regardless of the shape of the land.
How do you convert acres to square feet? Multiply the number of acres by 43,560. For example, 3 acres equals 3 x 43,560 = 130,680 square feet. To reverse it, divide the square feet by 43,560 to get acres.
Does the shape of the land change the conversion? No. An acre is a unit of area, so a long narrow strip and a square plot that both measure one acre each contain the same 43,560 square feet. Shape only affects the length and width, not the total area.
