Acreage Calculator
Enter a lot's length and width, or its total square footage directly, to calculate its size in acres — useful when a property listing gives dimensions but not acreage, or vice versa.
Acres
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Enter your lot dimensions to calculate.
How the Acreage formula works
One acre is defined as exactly 43,560 square feet:
Acres = (Length × Width) / 43,560
Step-by-step calculation
- Multiply the lot's length by its width to get total square feet (skip this if you already have total square footage).
- Divide by 43,560, the number of square feet in one acre.
Worked example
A lot measuring 200 ft × 300 ft: Area = 200 × 300 = 60,000 ft². Acres = 60,000/43,560 ≈ 1.38 acres.
Frequently asked questions
Why is an acre exactly 43,560 square feet?
It's a historical unit originally based on the area a yoke of oxen could plow in a day, later standardized to a fixed value — 43,560 ft² is the modern legal definition used consistently in the US and several other countries.
Does an acre have to be a square shape?
No — an acre is a unit of area, not a fixed shape. A rectangular, irregular, or oddly-shaped lot can all be exactly one acre as long as the total area matches 43,560 square feet.