Acres to Square Feet Converter
Convert acres to square feet instantly and back. Uses the exact 43,560 sq ft per acre figure, with worked examples, a land-size chart and common acre to sq ft conversions.
Updated 2026-06-14 · Free · No sign-up · Runs privately in your browser
Show the formula & steps
How the Acres to Square Feet Converter Works
This converter switches between acres and square feet (sq ft) in both directions, using the exact figure of 43,560 square feet per acre. Type a value, pick the direction, and the result updates live with the steps shown.
The Formula
Square feet = acres × 43,560
One acre is defined as exactly 43,560 square feet, which also equals 4,840 square yards. To convert square feet back to acres, divide by 43,560.
Worked Example
Convert 0.5 acres to square feet:
- 0.5 × 43,560 = 21,780 sq ft
Convert 10,000 square feet to acres:
- 10,000 ÷ 43,560 = 0.2296 acres
Land-Size Reference Chart
| Acres | Square feet |
|---|---|
| 0.10 | 4,356 |
| 0.25 | 10,890 |
| 0.50 | 21,780 |
| 1 | 43,560 |
| 2 | 87,120 |
Why the Acre Is 43,560 sq ft
The acre comes from medieval farming: it was the area a yoke of oxen could plow in one day, traditionally a strip 1 furlong (660 ft) long by 1 chain (66 ft) wide. Multiply those and you get 43,560 square feet — the figure still used in US real estate and land surveying today.
Frequently asked questions
How many square feet are in an acre?+
One acre equals exactly 43,560 square feet. It also equals 4,840 square yards or about 4,047 square meters.
How do I convert acres to square feet?+
Multiply the number of acres by 43,560. For example, 0.5 acres × 43,560 = 21,780 square feet. To reverse it, divide square feet by 43,560.
How big is a quarter acre in square feet?+
A quarter acre is 10,890 square feet. Multiply 0.25 by 43,560 to confirm the figure, a common size for a suburban building lot.
How many square feet is 2 acres?+
2 acres equals 87,120 square feet. Multiply 2 by 43,560 to confirm the figure.
Where does the number 43,560 come from?+
An acre was historically the area one ox team could plow in a day: a strip 1 furlong (660 ft) by 1 chain (66 ft), which equals 43,560 square feet.