Convert Square Feet to Acres

1 ft² = 0.000023 ac. Enter any value below.

Converted to every unit

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Square Feet to Acres formula

ac = ft² × 0.000023

A square foot is 144 square inches, the standard unit for US home sizes. An acre is 43,560 square feet, about 4,046.86 square meters.

Worked example

To convert 5 ft², multiply by 0.000023: 5 ft² × 0.000023 = 0.000115 ac.

Square Feet to Acres conversion table

Square FeetAcres
1 ft²0.000023 ac
2 ft²0.000046 ac
3 ft²0.000069 ac
4 ft²0.000092 ac
5 ft²0.000115 ac
6 ft²0.000138 ac
7 ft²0.000161 ac
8 ft²0.000184 ac
9 ft²0.000207 ac
10 ft²0.00023 ac
12 ft²0.000275 ac
15 ft²0.000344 ac
20 ft²0.000459 ac
25 ft²0.000574 ac
30 ft²0.000689 ac
40 ft²0.000918 ac
50 ft²0.001148 ac
75 ft²0.001722 ac
100 ft²0.002296 ac
250 ft²0.005739 ac
500 ft²0.011478 ac
1,000 ft²0.022957 ac

Frequently asked questions

How many acres are in a square foot?

1 ft² equals 0.000023 ac.

How do I convert square feet to acres?

Use the formula ac = ft² × 0.000023. For example, 5 ft² = 0.000115 ac.

Last reviewed: October 2026 · Uses exact, internationally defined conversion factors.