How many acres are in 1 square foot?

1 square foot equals 0.0000229568 ac.

How do I convert acres back to square feet?

Use the reverse converter: 1 acre equals 43560 ft².

Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.

To convert square feet to acres, multiply the value by 0.0000229568411.

ac = ft² × 0.0000229568411

40 ft² × 0.0000229568411 = 0.0009183 ac

Square Foot (ft²): Used for homes and property in the US and UK. Exactly 0.09290304 square metres.
Acre (ac): Used for land area in the US and UK. Exactly 4,046.8564224 square metres, historically a day's ploughing for a yoke of oxen.

How do I convert square feet to acres?: To convert square feet to acres, multiply the value by 0.0000229568411.
How many acres are in 1 square foot?: 1 square foot equals 0.0000229568 ac.
How many acres are in 10 square feet?: 10 ft² equals 0.000229568 ac.
How do I convert acres back to square feet?: Use the reverse converter: 1 acre equals 43560 ft².
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.