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.
- To convert the other way, type into Square feet and the acres are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only acre ⇄ ft². Need a different unit? Use the general area converter, where you can choose any “from” and “to” unit.
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. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).
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 |
What is an 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.
What is a square foot?
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.
Common mistakes to avoid
Converting area with a length factor (1 m = 3.28 ft, but 1 m² = 10.76 ft², not 3.28 ft²), and assuming regional land units such as marla, bigha or katha have one standard size everywhere.
Formula
1 acre = 43,560 ft²1 ft² = 2.295684 × 10^-5 acreft² = acre × 43,560Worked example
Inputs — Acres: 1 acre.
Results — Square feet = 43,560 ft².
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 acre in square feet?
10 acre = 435,600 ft².
What is 5 acre in square feet?
5 acre = 217,800 ft².
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between acres and square feet. To pick any area unit, use the general area converter linked under Related calculators.
What formula does the Acres to Square Feet Converter use?
1 acre = 43,560 ft².