# 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**

- Convert acres to square miles
- 1 acre is equal to 0.001563 square miles
- Convert acres to square yards
- 1 acre is equal to 4,840 square yards
- Convert acres to square feet
- 1 acre is equal to 43,560 square feet
- Convert acres to square inches
- 1 acre is equal to 6,272,640 square inches

**SI Units**

- Convert acres to square kilometers
- 1 acre is equal to 0.004047 square kilometers
- Convert acres to square meters
- 1 acre is equal to 4,047 square meters
- Convert acres to square centimeters
- 1 acre is equal to 40,468,564 square centimeters
- Convert acres to square millimeters
- 1 acre is equal to 4,046,856,422 square millimeters

**Other Metric Units**

- Convert acres to hectares
- 1 acre is equal to 0.404686 hectares
- Convert acres to ares
- 1 acre is equal to 40.468564 ares

## 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. 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 |

## Unit of Measurement Conversion Made Easy!

There are thousands of units of measure in use across the globe, and converting from one to another can be very difficult since each conversion requires a different formula to derive the result. Our unit of measurement conversion tools are meant to be dead easy. We break the mold of the typical dry and complicated experience. In addition to converting from one measurement to another, we provide the formula so you can see how the conversion is done, use it on you’re own calculator if you need to!

## Understanding the Metric System

The metric system makes it relatively easy to convert from one metric unit to another metric unit. The metric system uses a base unit, think meters or grams, and a prefix such as kilo or milli. The prefixes differ from the base units by differing powers of 10. So to convert within the metric system it’s usually a matter of multiplying or dividing by one of the powers of 10.

### Here is a list of some of the common metric prefixes:

- “kilo” – 1,000x larger
- “hecto” – 100x larger
- “deca” – 10x larger
- “deci” – 10x smaller
- “centi” – 100x smaller
- “milli” – 1,000x smaller

There is a helpful mnemonic for remembering the prefixes: “King Henry Died Until Drinking Chocolate Milk.”

The u in Until refers to the base unit.