# Convert Square Feet to Acres

Please provide values below to convert square foot [ft^2] to acre [ac], or *vice versa*.

**Definition: Square Foot**

Square foot (symbol: sq ft) is an area unit used in the imperial and US customary systems. It is defined as the area of a square with sides of 1 foot. One square foot equals to 144 square inches.

**Definition: Acre**

Acre (symbol: ac) is a unit of land area used in the imperial and US customary systems. It is defined as the area of 1 chain (66 feet) by 1 furlong (660 feet), which is exactly equal to 1/640 of a square mile or 43,560 square feet. The most commonly used acre today is the international acre, which is defined as exactly 4,046.8564224 square meters in 1959.

### Square Foot to Acre Conversion Table

Square Foot [ft^2] | Acre [ac] |
---|---|

0.01 ft^2 | 2.2956841138659E-7 ac |

0.1 ft^2 | 2.2956841138659E-6 ac |

1 ft^2 | 2.2956841138659E-5 ac |

2 ft^2 | 4.5913682277319E-5 ac |

3 ft^2 | 6.8870523415978E-5 ac |

5 ft^2 | 0.0001147842056933 ac |

10 ft^2 | 0.00022956841138659 ac |

20 ft^2 | 0.00045913682277319 ac |

50 ft^2 | 0.001147842056933 ac |

100 ft^2 | 0.0022956841138659 ac |

1000 ft^2 | 0.022956841138659 ac |

### How to Convert Square Foot to Acre

1 ft^2 = 2.2956841138659E-5 ac

1 ac = 43560 ft^2

**Example:** convert 15 ft^2 to ac:

15 ft^2 = 15 × 2.2956841138659E-5 ac = 0.00034435261707989 ac