Convert Square Feet to Acres

Enter the area in square feet below to get the value converted to acres.

Results in Acres:
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1 sq ft = 2.2957E-5 ac

How to Convert Square Feet to Acres

Calculators can be used to convert measurements from one unit to another

To convert a square foot measurement to a acre measurement, multiply the area by the conversion ratio. One square foot is equal to 2.2957E-5 acres, so use this simple formula to convert:

acres = square feet × 2.2957E-5

The area in acres is equal to the square feet multiplied by 2.2957E-5.

For example, here's how to convert 5 square feet to acres using the formula above.
5 sq ft = (5 × 2.2957E-5) = 0.000115 ac

Square feet and acres are both units used to measure area. Keep reading to learn more about each unit of measure.

Square Feet

One square foot is equal to the area of a square with sides that are 1 foot in length. One square foot is roughly equal to 144 square inches.

The square foot is a US customary and imperial unit of area. A square foot is sometimes also referred to as a square ft. Square feet can be abbreviated as sq ft, and are also sometimes abbreviated as ft². For example, 1 square foot can be written as 1 sq ft or 1 ft².

Try our square footage calculator to calculate the area of a space.


One acre is defined as the area equal to a space that is one chain (66 ft) by one furlong (660 ft), or 10 square chains. That's equal to 43,560 square feet for those unfamiliar with those units of measure.

The acre is a US customary and imperial unit of area. Acres can be abbreviated as ac, for example 1 acre can be written as 1 ac.

Try our acreage calculator to find the area of a plot of land in acres by locating the boundaries on a map.

Square Foot Measurements and Equivalent Acre Conversions

Common square foot values converted to the equivalent acre value
Square Feet Acres
1 sq ft 0.000022957 ac
2 sq ft 0.000045914 ac
3 sq ft 0.000068871 ac
4 sq ft 0.000091827 ac
5 sq ft 0.000115 ac
6 sq ft 0.000138 ac
7 sq ft 0.000161 ac
8 sq ft 0.000184 ac
9 sq ft 0.000207 ac
10 sq ft 0.00023 ac
11 sq ft 0.000253 ac
12 sq ft 0.000275 ac
13 sq ft 0.000298 ac
14 sq ft 0.000321 ac
15 sq ft 0.000344 ac
16 sq ft 0.000367 ac
17 sq ft 0.00039 ac
18 sq ft 0.000413 ac
19 sq ft 0.000436 ac
20 sq ft 0.000459 ac
21 sq ft 0.000482 ac
22 sq ft 0.000505 ac
23 sq ft 0.000528 ac
24 sq ft 0.000551 ac
25 sq ft 0.000574 ac
26 sq ft 0.000597 ac
27 sq ft 0.00062 ac
28 sq ft 0.000643 ac
29 sq ft 0.000666 ac
30 sq ft 0.000689 ac
31 sq ft 0.000712 ac
32 sq ft 0.000735 ac
33 sq ft 0.000758 ac
34 sq ft 0.000781 ac
35 sq ft 0.000803 ac
36 sq ft 0.000826 ac
37 sq ft 0.000849 ac
38 sq ft 0.000872 ac
39 sq ft 0.000895 ac
40 sq ft 0.000918 ac

More Square Foot Area Conversions

US Customary
Convert to Square Miles
1 sq ft is equal to 3.587E-8 square miles
Convert to Square Yards
1 sq ft is equal to 0.111111 square yards
Convert to Square Inches
1 sq ft is equal to 144 square inches
SI Units
Convert to Square Kilometers
1 sq ft is equal to 9.2903E-8 square kilometers
Convert to Square Meters
1 sq ft is equal to 0.092903 square meters
Convert to Square Centimeters
1 sq ft is equal to 929.0304 square centimeters
Convert to Square Millimeters
1 sq ft is equal to 92,903 square millimeters
Other Metric Units
Convert to Hectares
1 sq ft is equal to 9.2903E-6 hectares
Convert to Ares
1 sq ft is equal to 0.000929 ares