Square Feet to Acres Converter
Unit ConversionConvert square feet to acres using the exact 43,560 square feet per acre factor.
Acres
Equivalent area in acres
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Unit Conversion calculators
This calculator converts square feet to acres using the exact conversion factor: divide the square-foot value by 43,560, since 1 acre is defined as exactly 43,560 square feet. Enter any value above for an instant result.
Unlike a temperature or currency conversion, this factor has no rounding or regional variation, since both the square foot and the acre are fixed units defined in terms of feet. An acre is, in fact, exactly the area of a rectangle measuring 660 feet by 66 feet, though it does not have to be that shape, since any area totaling 43,560 square feet counts as one acre.
A real conversion table for the square-footage values people look up most often, common lot-size fractions like a quarter acre or half acre, and the football-field reference point everyone eventually asks about, are below.
Square feet to acres conversion table
This table covers the square-footage values people look up most often, from a small residential lot to a full square mile.
| Square Feet | Acres |
|---|---|
| 1,000 ft² | 0.0230 ac |
| 5,000 ft² | 0.1148 ac |
| 7,500 ft² | 0.1722 ac |
| 10,000 ft² | 0.2296 ac |
| 12,000 ft² | 0.2755 ac |
| 15,000 ft² | 0.3444 ac |
| 20,000 ft² | 0.4591 ac |
| 25,000 ft² | 0.5739 ac |
| 43,560 ft² | 1.0000 ac |
| 50,000 ft² | 1.1478 ac |
| 100,000 ft² | 2.2957 ac |
| 200,000 ft² | 4.5914 ac |
| 500,000 ft² | 11.4784 ac |
| 1,000,000 ft² | 22.9568 ac |
Fractional acre lot sizes
Residential lot sizes are often described as a fraction of an acre rather than in square feet, so it helps to know the exact square footage each common fraction represents:
- Quarter acre (1/4 acre) = 10,890 square feet
- Half acre (1/2 acre) = 21,780 square feet
- One acre = 43,560 square feet
- Two acres = 87,120 square feet
These are exact figures, since an acre is a fixed unit that does not vary by lot shape or location. If you need the metric equivalent instead, see the Hectares to Acres Converter.
The square feet to acres formula
To convert square feet to acres, divide the square-foot value by 43,560. For example, 21,780 square feet divided by 43,560 equals 0.5 acres, exactly half an acre.
To go the other way, from acres back to square feet, multiply by 43,560. For example, 0.5 acres times 43,560 equals 21,780 square feet. For that direction, use the Acres to Square Feet Converter.
A standard American football field, including both end zones, measures 360 feet by 160 feet, an area of 57,600 square feet. Divided by 43,560, that works out to about 1.32 acres, a commonly cited real-world reference point. For any other area unit, use the Area Converter.
Frequently Asked Questions
How many square feet are in one acre?
There are exactly 43,560 square feet in one acre.
How many acres is 10,000 square feet?
10,000 square feet equals approximately 0.2296 acres.
How many square feet is a quarter acre?
A quarter acre equals exactly 10,890 square feet.
How many square feet is a half acre?
A half acre equals exactly 21,780 square feet.
How many acres is a football field?
A standard American football field, including the end zones, is about 1.32 acres (57,600 square feet), measuring 360 feet by 160 feet.
Why is an acre exactly 43,560 square feet?
An acre was historically defined as the area a team of oxen could plow in one day, standardized as a rectangle 660 feet long by 66 feet wide, a furlong by a chain. Multiplying those two figures gives exactly 43,560 square feet, and the unit has stayed fixed at that value ever since, regardless of the shape of the actual lot.
Does the shape of a lot affect how many acres it is?
No. An acre is a fixed unit of area, not a specific shape, so any lot totaling 43,560 square feet is one acre whether it is square, rectangular, or an irregular shape.
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