Acreage Calculator
Land gets measured in feet but bought and sold by the acre, and the conversion isn't one most people carry in their head. Enter your lot's length and width below, or switch to a circle or triangle for an odd-shaped parcel. You'll get the size in acres, square feet, square yards, and hectares at once, so you can talk to a seller, a county office, or a surveyor in whatever unit they use.
How this is calculated
Area first, then acres. Multiply length by width for a rectangle, or use the shape option for a round or triangular parcel, to get square feet. One acre is 43,560 square feet, a fixed figure, so divide your square footage by 43,560 and you've got acres. The tool also converts to square yards (divide by 9), hectares, and square meters in the same step.
A worked example
A building lot 150 feet wide and 200 feet deep is 30,000 square feet. Divide by 43,560 and that's about 0.69 acres, just over two-thirds of an acre. A square 10-acre parcel, by comparison, runs about 660 feet on a side. The calculator turns your dimensions into acres the moment you type them.
Common questions
An acre is 43,560 square feet. Picture a square about 209 feet on each side, or roughly 90% of an American football field including the end zones. It's a fixed area, not a shape, so an acre can be long and narrow or square.
Find the area in square feet (length times width for a rectangular lot), then divide by 43,560. Enter your dimensions above and the calculator does it, plus the conversions to hectares and square yards.
Break it into rectangles and triangles, calculate each with the shape option, and add them up. For a legal boundary, a licensed survey is the only number a county or lender will accept.
Exactly 43,560. That number never changes, which is why every acreage conversion runs through it.
Estimates for planning. Verify against your supplier's units and your local building codes before ordering or building. For anything structural, follow your engineer or local code.