The acres to square feet factor
One acre equals 43,560 square feet, so to convert acres to square feet you multiply by 43,560. For example, 2 acres × 43,560 = 87,120 sq ft. The acre is a standard unit of land area in the US and UK. Need the reverse? Use the square feet to acres calculator.
The figure is not arbitrary. An acre was historically defined as one chain by one furlong, that is 66 feet by 660 feet, which multiplies out to exactly 43,560 square feet. That is why the number looks odd next to metric units: it comes from a system built on chains, rods and furlongs rather than powers of ten.
Many people follow this up with the meters to feet calculator.
How to use this calculator
Enter an area in acres and the converter instantly shows the equivalent in square feet — useful for sizing lots, fields, and building plots. Just multiply acres by 43,560.
A worked example: a builder quotes on a plot listed as 0.75 acres. Multiply 0.75 by 43,560 and the plot is 32,670 square feet. If a house footprint covers 2,400 sq ft, it uses under 8% of the site. Decimals are fine - 1.6 acres gives 69,696 sq ft - and there is no need to round the factor, because 43,560 is exact rather than approximate.
The cubic feet calculator is the natural next step once you have this figure.
Acres to square feet reference table
Common conversions:
| Acres | Square feet |
|---|---|
| 0.25 acre | 10,890 sq ft |
| 0.5 acre | 21,780 sq ft |
| 1 acre | 43,560 sq ft |
| 2 acres | 87,120 sq ft |
| 5 acres | 217,800 sq ft |
Two comparisons help make the numbers concrete: an American football field including both end zones is about 57,600 sq ft, or roughly 1.32 acres, and a typical suburban building lot of a quarter acre is 10,890 sq ft. Watch the unit names too - acres should never be confused with square miles, of which one contains 640 acres.
The feet to meters calculator answers the question that usually follows this one.
Frequently asked questions
- How do I convert acres to square feet?
- Multiply acres by 43,560. For example, 2 acres × 43,560 = 87,120 sq ft.
- How many square feet are in 2 acres?
- 2 acres equals 87,120 square feet.
- How many square feet is one acre?
- One acre equals 43,560 square feet.
- How big is a quarter acre in square feet?
- A quarter acre is 10,890 square feet (43,560 ÷ 4).
- How many feet across is a square acre?
- About 208.7 feet on each side, since the square root of 43,560 is roughly 208.71. An acre has no fixed shape, though - it is only a measure of area, so a long narrow strip and a near-square lot can both be exactly one acre.