# Acres Conversion

The acre is a unit used to measure area. Use one of the conversion calculators below to convert to another unit of measure, or read on to learn more about acres.

## Acre Conversion Calculators

Choose a unit of area to convert to.

**US Customary**

**SI Units**

**Other Metric Units**

## Acre Definition and Usage

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.^{[1]} 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.

### Background and Origin

The acre originated as a unit of measurement to define the area of a field that could be plowed in a single day with a yolk of oxen. The word was derived from the Middle English "aker."

### Uses

The acre is generally used to measure parcels of land. It's used primarily in the United States, United Kingdom, and several former Commonwealth countries.

## Acres Measurement Conversion Table

acres | square miles | square yards | square feet | square inches | square kilometers | square meters | square centimeters | square millimeters | hectares | ares |
---|---|---|---|---|---|---|---|---|---|---|

1 ac | 0.001563 sq mi | 4,840 sq yd | 43,560 sq ft | 6,272,640 sq in | 0.004047 sq km | 4,047 sq m | 40,468,564 sq cm | 4,046,856,422 sq mm | 0.404686 ha | 40.468564 a |

2 ac | 0.003125 sq mi | 9,680 sq yd | 87,120 sq ft | 12,545,280 sq in | 0.008094 sq km | 8,094 sq m | 80,937,128 sq cm | 8,093,712,845 sq mm | 0.809371 ha | 80.937128 a |

3 ac | 0.004688 sq mi | 14,520 sq yd | 130,680 sq ft | 18,817,920 sq in | 0.012141 sq km | 12,141 sq m | 121,405,693 sq cm | 12,140,569,267 sq mm | 1.214057 ha | 121.405693 a |

4 ac | 0.00625 sq mi | 19,360 sq yd | 174,240 sq ft | 25,090,560 sq in | 0.016187 sq km | 16,187 sq m | 161,874,257 sq cm | 16,187,425,690 sq mm | 1.618743 ha | 161.874257 a |

5 ac | 0.007813 sq mi | 24,200 sq yd | 217,800 sq ft | 31,363,200 sq in | 0.020234 sq km | 20,234 sq m | 202,342,821 sq cm | 20,234,282,112 sq mm | 2.023428 ha | 202.342821 a |

6 ac | 0.009375 sq mi | 29,040 sq yd | 261,360 sq ft | 37,635,840 sq in | 0.024281 sq km | 24,281 sq m | 242,811,385 sq cm | 24,281,138,534 sq mm | 2.428114 ha | 242.811385 a |

7 ac | 0.010938 sq mi | 33,880 sq yd | 304,920 sq ft | 43,908,480 sq in | 0.028328 sq km | 28,328 sq m | 283,279,950 sq cm | 28,327,994,957 sq mm | 2.832799 ha | 283.27995 a |

8 ac | 0.0125 sq mi | 38,720 sq yd | 348,480 sq ft | 50,181,120 sq in | 0.032375 sq km | 32,375 sq m | 323,748,514 sq cm | 32,374,851,379 sq mm | 3.237485 ha | 323.748514 a |

9 ac | 0.014063 sq mi | 43,560 sq yd | 392,040 sq ft | 56,453,760 sq in | 0.036422 sq km | 36,422 sq m | 364,217,078 sq cm | 36,421,707,802 sq mm | 3.642171 ha | 364.217078 a |

10 ac | 0.015625 sq mi | 48,400 sq yd | 435,600 sq ft | 62,726,400 sq in | 0.040469 sq km | 40,469 sq m | 404,685,642 sq cm | 40,468,564,224 sq mm | 4.046856 ha | 404.685642 a |

11 ac | 0.017188 sq mi | 53,240 sq yd | 479,160 sq ft | 68,999,040 sq in | 0.044515 sq km | 44,515 sq m | 445,154,206 sq cm | 44,515,420,646 sq mm | 4.451542 ha | 445.154206 a |

12 ac | 0.01875 sq mi | 58,080 sq yd | 522,720 sq ft | 75,271,680 sq in | 0.048562 sq km | 48,562 sq m | 485,622,771 sq cm | 48,562,277,069 sq mm | 4.856228 ha | 485.622771 a |

13 ac | 0.020313 sq mi | 62,920 sq yd | 566,280 sq ft | 81,544,320 sq in | 0.052609 sq km | 52,609 sq m | 526,091,335 sq cm | 52,609,133,491 sq mm | 5.260913 ha | 526.091335 a |

14 ac | 0.021875 sq mi | 67,760 sq yd | 609,840 sq ft | 87,816,960 sq in | 0.056656 sq km | 56,656 sq m | 566,559,899 sq cm | 56,655,989,914 sq mm | 5.665599 ha | 566.559899 a |

15 ac | 0.023438 sq mi | 72,600 sq yd | 653,400 sq ft | 94,089,600 sq in | 0.060703 sq km | 60,703 sq m | 607,028,463 sq cm | 60,702,846,336 sq mm | 6.070285 ha | 607.028463 a |

16 ac | 0.025 sq mi | 77,440 sq yd | 696,960 sq ft | 100,362,240 sq in | 0.06475 sq km | 64,750 sq m | 647,497,028 sq cm | 64,749,702,758 sq mm | 6.47497 ha | 647.497028 a |

17 ac | 0.026563 sq mi | 82,280 sq yd | 740,520 sq ft | 106,634,880 sq in | 0.068797 sq km | 68,797 sq m | 687,965,592 sq cm | 68,796,559,181 sq mm | 6.879656 ha | 687.965592 a |

18 ac | 0.028125 sq mi | 87,120 sq yd | 784,080 sq ft | 112,907,520 sq in | 0.072843 sq km | 72,843 sq m | 728,434,156 sq cm | 72,843,415,603 sq mm | 7.284342 ha | 728.434156 a |

19 ac | 0.029688 sq mi | 91,960 sq yd | 827,640 sq ft | 119,180,160 sq in | 0.07689 sq km | 76,890 sq m | 768,902,720 sq cm | 76,890,272,026 sq mm | 7.689027 ha | 768.90272 a |

20 ac | 0.03125 sq mi | 96,800 sq yd | 871,200 sq ft | 125,452,800 sq in | 0.080937 sq km | 80,937 sq m | 809,371,284 sq cm | 80,937,128,448 sq mm | 8.093713 ha | 809.371284 a |

## References

- National Institute of Standards and Technology, Handbook 44 - 2014 Edition, https://www.nist.gov/sites/default/files/documents/2017/05/09/appc-14-hb44-final.pdf

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