An acre is exactly 43,560 square feet. A quarter-acre house lot is 10,890 ft².
How to use the Acres to Square Feet Converter
- Type the number of acres into the Acres field. Decimals such as 0.5 are fine.
- Read the answer in Square feet. It updates as you type, with no button to press. The same amount is also shown in m², yd², ha.
- To go from square feet back to acres, type into the Square feet field instead. Every field also has a unit menu with all 16 area units, for example m², km², cm², mm², ha, a, in², yd², mi², cent, gaj², marla.
Results update as you type, and everything is calculated in your browser.
How it works
Both units measure area, so they are always in the same ratio: one acre equals 43,560 square feet. The calculator multiplies the number of acres you type by 43,560 to give square feet, and when you type into the square feet field it divides by the same factor to give acres. Because the ratio never changes, doubling the acres always doubles the square feet, for example 2 acre is 87,120 ft².
How to convert acres to square feet
- Write down the value in acres, for example 1 acre.
- Multiply by the conversion factor 43,560 (because 1 acre = 43,560 ft²).
- 1 × 43,560 = 43,560 ft².
- To go back from square feet to acres, divide by 43,560, or multiply by 2.295684 × 10-5.
acre to ft² conversion table
| Acres | Square feet | Square feet | Acres |
|---|---|---|---|
| 0.1 acre | 4,356 ft² | 1 ft² | 2.295684 × 10-5 acre |
| 0.125 acre | 5,445 ft² | 2 ft² | 4.591368 × 10-5 acre |
| 0.25 acre | 10,890 ft² | 5 ft² | 0.00011478421 acre |
| 0.5 acre | 21,780 ft² | 10 ft² | 0.00022956841 acre |
| 0.75 acre | 32,670 ft² | 20 ft² | 0.00045913682 acre |
| 1 acre | 43,560 ft² | 50 ft² | 0.0011478421 acre |
| 2 acre | 87,120 ft² | 100 ft² | 0.0022956841 acre |
| 5 acre | 217,800 ft² | 1,000 ft² | 0.022956841 acre |
| 10 acre | 435,600 ft² |
Area units explained
- Acre (acre)
- An acre is exactly 43,560 square feet, about 4,047 m². Historically it was the land a team of oxen could plough in a day. It remains the land unit in the U.S. and UK.
- Square foot (ft²)
- The square foot is a square 1 ft on each side, exactly 0.09290304 m². U.S., Canadian, UK and South Asian property listings quote floor space in square feet.
Quick mental conversion
For a fast estimate, multiply acres by about 44,000 to get square feet; the error is about 1.0%. Use the calculator above when you need the exact figure.
Formula
1 acre = 43,560 ft²
1 ft² = 2.295684 × 10⁻⁵ acres
ft² = acre × 43,560
Worked example
Inputs: Acres: 1 acre.
Results: Square feet = 43,560 ft²; Square metres = 4,046.8564224 m²; Square yards = 4,840 yd²; Hectares = 0.40468564 ha.
Frequently asked questions
How many square feet in half an acre?
21,780 ft².
How many square feet in an acre?
43,560.
How do I convert acres to square feet?
Multiply the number of acres by 43,560. For example, 1 acre × 43,560 = 43,560 ft².
How do I convert square feet back to acres?
Divide by 43,560 (or multiply by 2.295684 × 10⁻⁵), or simply type the value into the square feet field above.
What is 10 acres in square feet?
10 acres = 435,600 ft².
What is 5 acres in square feet?
5 acres = 217,800 ft².
Is the acres to square feet conversion exact?
Yes. The official definitions (NIST and the SI) fix 1 acre = 43,560 ft² exactly, so the only difference you may see is rounding in the last displayed digit.