Square Feet to Acres Calculator
Enter any land area in square feet and convert it to acres instantly. The result also shows square metres, hectares and the side length the same area would have if it were a perfect square.
Convert square feet to acres
How to convert square feet to acres
Divide the number of square feet by 43,560. One acre contains exactly 43,560 square feet, so the formula is:
Acres = square feet ÷ 43,560
For example, 21,780 square feet is 0.5 acre, while 87,120 square feet is 2 acres. The conversion describes area only; it does not tell you the shape or dimensions of the property.
Common square feet to acres conversions
A common residential-lot scale, but the actual lot shape can vary.
Exactly one-half acre.
The standard acre conversion.
Twice the standard acre area.
Square footage is area, not lot dimensions
A 43,560-square-foot parcel does not have to be 208.71 × 208.71 feet. That is only the side length of a perfectly square one-acre parcel. A rectangular parcel 100 feet wide would need to be 435.6 feet long to contain the same one-acre area.
If you are trying to understand what an acreage figure might look like as a rectangle, use the Acre Dimensions Calculator. If the property is irregular, trace the actual boundary using the Acreage Calculator & Lot Size Map.
Frequently asked questions
How many acres is 10,000 square feet?
10,000 ÷ 43,560 is about 0.2296 acres.
How many acres is 20,000 square feet?
20,000 square feet is about 0.4591 acres.
How many square feet are in half an acre?
Half an acre is exactly 21,780 square feet.
Can square feet tell me how much fence I need?
No. Fence quantity depends on perimeter and which boundary sections you plan to fence. Two lots with the same area can have very different perimeters.
Need the actual property size?
Trace the boundary on a map and get square feet, acres and perimeter together.