Square feet to acres
One acre is 43,560 square feet. To convert square feet to acres, divide by 43,560; to go the other way, multiply acres by 43,560. The same calculator does both directions on one page, so you can check a lot size or a garden plan without re-entering numbers.
Sq ft to acres
Tap or click the yellow figure to edit it; the button beside it swaps the units.
Acres and square feet are both US customary and imperial units, so there is no metric side on this page. The 43,560 figure comes from old surveying practice: an acre was defined as one chain by one furlong. A chain is 66 feet and a furlong is 660 feet, and 66 times 660 is 43,560. For a typical suburban lot of 0.2 to 0.3 acres, that works out to 8,712 to 13,068 square feet.
This page uses US customary units only, meaning both square feet and acres belong to that system. If your lot or garden size is in metric, the square-meters-to-square-feet page handles that conversion.
Where does the 43,560-square-foot acre come from?
The number comes from old surveying units. One acre is defined as one chain by one furlong. A chain is 66 feet and a furlong is 660 feet, so 66 multiplied by 660 gives 43,560 square feet.
What is a part-acre lot?
A part-acre lot is any parcel smaller than one acre. A typical US suburban lot is 0.2 to 0.3 acres, which is 8,712 to 13,068 square feet. Divide the square footage by 43,560 to see the acreage.
How do I convert square feet to acres for lawn-care products?
Start with the total square footage of the area. Convert to acres by dividing by 43,560 if you need acreage for records or permits. For the lawn product itself, keep the square footage handy and follow the label's coverage rate, since products are often sold by area covered per unit.