What Is the Lot Size to Acres Calculator?
This calculator converts a property's lot size from square feet to acres. An acre is a unit of land area equal to exactly 43,560 square feet, a standard used widely in real estate and land surveying across the United States. Whether you're sizing up a building lot, a backyard, or a parcel of farmland, this tool gives you the acreage in seconds.
How to Use It
Enter the total area of your lot in square feet, then read the result in acres. If you only know the dimensions of a rectangular lot, first multiply length × width to get the square footage. For example, a lot that is 100 ft by 100 ft is 10,000 square feet.
The Formula Explained
The conversion is simple division:
$$\text{acres} = \frac{\text{square feet}}{43{,}560}$$
The constant 43,560 comes from the definition of an acre as one chain (66 ft) by one furlong (660 ft), which equals 43,560 square feet. Dividing any square-foot area by this number yields the equivalent acreage.
Worked Example
Suppose a residential lot measures 21,780 square feet. Dividing by 43,560 gives $$21{,}780 \div 43{,}560 = 0.5 \text{ acres}$$ — exactly half an acre. A larger 87,120 sq ft parcel would be 2 acres.
FAQ
How many square feet are in an acre? There are exactly 43,560 square feet in one acre.
How do I convert acres back to square feet? Multiply the number of acres by 43,560. For example, \(0.25 \times 43{,}560 = 10{,}890\) square feet.
Is an acre the same everywhere? The international (and US survey) acre used here is 43,560 square feet. This is the standard for almost all real estate purposes.
