Quick answer: One acre = 43,560 square feet. To convert square feet to acres, divide by 43,560; to go the other way, multiply by 43,560.
Use the tool below to convert any value between acres, square feet, square meters, hectares, and square miles, or to calculate the area of a lot from its length and width in feet.
Area unit converter
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Enter the length and width of a rectangular lot in feet.
What is an acre?
An acre is a unit of land area equal to exactly 43,560 square feet. The measurement dates back to the area a yoke of oxen could plow in a day — one chain (66 feet) wide by one furlong (660 feet) long. Today it's the standard way Americans describe lot and parcel size, while most of the world uses hectares (one hectare is about 2.47 acres).
Because an acre is just an amount of area, it has no fixed shape. A perfectly square acre measures roughly 208.7 feet on each side, but a real parcel can be long and narrow, L-shaped, or irregular and still total exactly one acre. That's why a number on paper rarely tells you where the boundary actually falls on the ground.
Here are the conversions people look up most often:
| Acres | Square feet | Square meters | Hectares |
|---|---|---|---|
| ¼ acre | 10,890 sq ft | 1,011.71 sq m | 0.1012 ha |
| ½ acre | 21,780 sq ft | 2,023.43 sq m | 0.2023 ha |
| 1 acre | 43,560 sq ft | 4,046.86 sq m | 0.4047 ha |
| 5 acres | 217,800 sq ft | 20,234.28 sq m | 2.0234 ha |
| 10 acres | 435,600 sq ft | 40,468.56 sq m | 4.0469 ha |
Whether you're sizing up a homestead lot, planning a fence, comparing listings, or splitting a parcel, these conversions and the calculator above cover the everyday math. When you need to know where that acreage physically sits on your land, that's a different question — one a map alone can't answer.
A calculator tells you the size — ParcelVision shows you the line on the ground
Knowing your lot is 1.38 acres doesn't tell you where the corner stakes are. ParcelVision draws your property line on the ground through your iPhone camera, so you can walk the boundary and see exactly where it falls. Search your address free.
Search Your Property FreeFrequently asked questions
How many square feet are in an acre?
There are exactly 43,560 square feet in one acre. This is the standard U.S. definition: 1 acre = 43,560 sq ft = 4,046.86 square meters = 0.4047 hectares = 1/640 of a square mile.
How do I convert square feet to acres?
Divide the number of square feet by 43,560. For example, 21,780 sq ft ÷ 43,560 = 0.5 acres, and 87,120 sq ft ÷ 43,560 = 2 acres. Use the converter above to do it instantly in either direction.
How big is a quarter-acre?
A quarter-acre (0.25 acre) is 10,890 square feet, roughly 1,012 square meters. A half-acre is 21,780 sq ft. For a square lot, a quarter-acre is about 104 feet by 104 feet.
How many acres is my lot?
Multiply the lot's length by its width in feet to get square feet, then divide by 43,560 to get acres. A 200 ft × 300 ft lot is 60,000 sq ft, or about 1.3774 acres. The lot calculator above does this automatically.