Area
Acres to Square Feet Converter
Convert acres and square feet both ways. 1 acre = 43,560 sq ft, with square metres and hectares shown too.
How to convert acres to square feet
One acre is defined as exactly 43,560 square feet, so converting between the two is a single multiplication or division. To go from acres to square feet, multiply by 43,560; to go the other way, divide by 43,560. For example, half an acre is 0.5 × 43,560 = 21,780 sq ft, and a 10,000 sq ft plot is 10,000 ÷ 43,560 ≈ 0.2296 acres. Type into either field above and the other updates instantly, with square metres and hectares shown alongside.
The acre traces back to the area a yoke of oxen could plough in a day — historically one chain (66 ft) by one furlong (660 ft), which is exactly 43,560 square feet. That irregular shape is why the number isn't round, but the modern definition is fixed and exact.
Acres to square feet conversion table
| 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 |
| 40 ac | 1,742,400 sq ft |
| 100 ac | 4,356,000 sq ft |
Acres, square metres and hectares
If you work in metric units, it helps to know that 1 acre equals about 4,046.86 m² and 0.404686 hectares — so roughly 2.47 acres make one hectare. These metric equivalents update live above, which is handy when a listing quotes land in acres but local records use square metres or hectares. Because the conversion factors are exact constants, the results are precise rather than approximate.
Frequently asked questions
How many square feet are in an acre?
Exactly 43,560 square feet. This is a fixed definition, so 1 acre always equals 43,560 sq ft.
How do I convert square feet back to acres?
Divide the number of square feet by 43,560. For example, 21,780 sq ft ÷ 43,560 = 0.5 acres. Just type into the Square feet box above and the acre value fills in automatically.
How big is an acre in square metres and hectares?
One acre is about 4,046.86 square metres, or 0.404686 hectares. Roughly 2.47 acres make up one hectare.
Why is an acre 43,560 square feet and not a round number?
The acre originally measured one chain (66 ft) by one furlong (660 ft) of ploughed land, which works out to exactly 43,560 square feet. The odd-looking figure comes from those old units.
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