Acres to Square Feet
Convert acres to square feet instantly. Free, fast, no signup.
How to use this tool
- Enter acres in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your square feet and the full breakdown beneath it.
Convert acres to square feet instantly. Free, fast, no signup.
Formula
Square Feet = Acres × 43,560
One acre is defined as exactly 43,560 square feet by US customary and imperial measurement standards.
How it works
To convert acres to square feet, multiply the number of acres by 43,560. This is an exact definition: the acre was historically defined as the area a yoke of oxen could plow in one day, later standardized to exactly 43,560 square feet (equivalent to a rectangle 660 ft × 66 ft, i.e., one furlong by one chain). No rounding is needed for this conversion.
Common mistake: Confusing acres with hectares — 1 acre is about 43,560 sq ft while 1 hectare is about 107,639 sq ft, so treating them as equivalent leads to errors of more than 2.4 times.
Worked example
Convert 1 acre to square feet
- Start with the input: 1 acre.
- Apply the exact definition: 1 acre = 43,560 square feet.
- Multiply: 1 × 43,560 = 43,560 square feet.
1 acre = 43,560 square feet
Common mistakes to avoid
- Multiplying by 4,047 (square meters per acre) instead of 43,560 (square feet per acre), mixing unit systems mid-conversion.
- Entering a lot size in square feet and treating the output as if it were still in acres.
- Assuming the listed acreage equals usable area — setbacks and easements reduce buildable area below the raw acreage.
Key terms
- Acre
- A unit of land area used in the US and imperial systems, defined as exactly 43,560 square feet or about 4,047 square metres.
- Square Foot (sq ft)
- A unit of area equal to the area of a square with 1-foot sides. There are 144 square inches in one square foot.
- Furlong
- A unit of length equal to 660 feet (201.168 metres). One acre is defined as one furlong × one chain (66 feet).
- Chain
- A unit of length equal to 66 feet or 22 yards, historically used in land surveying. One acre = 1 furlong × 1 chain.
Frequently asked questions
- How do I convert acres to square feet?
- Multiply the number of acres by 43560 to get square feet.