Acre (ac) Area Conversion Calculator

Acre Conversion Calculator

Enter a value in acres below to convert to another unit of area.

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What Is an Acre?

An acre is a unit used to measure area.

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.

You can use an acreage calculator to measure 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.

How Much Is an Acre?

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 or 1/640 of a square mile for those unfamiliar with those units of measure.

illustration showing the size of an acre is a parcel of land that is 66 feet by 660 feet.

How to Convert Acres

To convert acres to another unit of area, you need to multiply the value by a conversion factor. A conversion factor is a numerical value used to change the units of a measurement without changing the value.^[2]

You can find the conversion factors for acres in the conversion table below.

Then, multiply the area measurement by the conversion factor to find the equivalent value in the desired unit of measurement.

acres × conversion factor = result

You can also use a calculator, such as one of the converters below, for the conversion.

Acre Conversion Table

Common acre values and equivalent imperial and metric area measurements
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, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, Handbook 44 - 2019 Edition, https://nvlpubs.nist.gov/nistpubs/hb/2019/NIST.HB.44-2019.pdf

National Institute of Standards & Technology, Unit Conversion, https://www.nist.gov/pml/owm/metric-si/unit-conversion