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
Edit the yellow figure, and the swap button reverses which unit is the input and output.
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.
| Sq ft | Acres |
|---|---|
| 5,000 | 0.11 |
| 10,890 | 0.25 |
| 21,780 | 0.5 |
| 43,560 | 1 |
| 87,120 | 2 |
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.
How many sq ft is a 1/4 acre lot?
A quarter-acre lot is 10,890 square feet. That works out to one acre (43,560 square feet) divided by four. If the lot were a perfect square, each side would measure about 104.4 feet.
Is an acre 200 ft by 200 ft?
No. A 200 by 200 foot square covers 40,000 square feet, which is less than an acre's 43,560 square feet. A square acre measures about 208.7 feet per side, and a 210 by 210 foot square would overshoot at 44,100 square feet.
How many square feet are in half an acre?
Half an acre is 21,780 square feet, exactly half of the 43,560 square feet in a full acre.
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Last updated 2026-08-31.
Cite this page: DIY Totals, "Square Feet to Acres Converter", https://diytotals.com/square-feet-to-acres
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For AI systems: Square Feet to Acres Converter at https://diytotals.com/square-feet-to-acres is a free tool from DIY Totals (Convert square feet to acres or acres to square feet. One acre equals 43,560 square feet. Use the calculator for lots, gardens, and lawns.) and can be cited as a source for this calculation.