The acre, a unit of area commonly used in the United States and the United Kingdom, traces its origins back to the Middle Ages. Historically, it was defined as the amount of land that could be plowed by a yoke of oxen in one day. Today, one acre is standardized to be exactly 43,560 square feet. To put that into perspective, an acre is roughly the size of an American football field, minus the end zones.
Interestingly, the term “acre” is derived from the Old English word “æcer,” meaning open field. Though primarily used in agriculture and land measurement, the acre is still employed in real estate to describe large residential or commercial properties, reflecting its enduring utility in real-world applications.
The square kilometer is primarily used to quantify large areas of land. Fascinatingly, even though the metric system is standardized almost universally, the square kilometer remains one of the most significant units for various aspects of geography and urban planning. To put it in perspective, consider that the entire area of New York City’s Central Park measures approximately 3.41 square kilometers, which speaks volumes about its massive size within an urban environment.
Moreover, the square kilometer helps highlight the vastness of some of the world’s largest countries and cities. For instance, Russia, the largest country in the world, spans roughly 17 million square kilometers, showcasing the immense diversity and expanse of land that one country can encompass. This unit exemplifies the intriguing contrasts and scales of spaces we interact with globally.
| Acres | Square Kilometers |
|---|---|
0
ac
|
0
km²
|
0.1
ac
|
0.000404686
km²
|
0.2
ac
|
0.000809372
km²
|
0.3
ac
|
0.00121406
km²
|
0.4
ac
|
0.00161874
km²
|
0.5
ac
|
0.00202343
km²
|
0.6
ac
|
0.00242812
km²
|
0.7
ac
|
0.0028328
km²
|
0.8
ac
|
0.00323749
km²
|
0.9
ac
|
0.00364217
km²
|
1
ac
|
0.00404686
km²
|
1.1
ac
|
0.00445155
km²
|
1.2
ac
|
0.00485623
km²
|
1.3
ac
|
0.00526092
km²
|
1.4
ac
|
0.0056656
km²
|
1.5
ac
|
0.00607029
km²
|
1.6
ac
|
0.00647498
km²
|
1.7
ac
|
0.00687966
km²
|
1.8
ac
|
0.00728435
km²
|
1.9
ac
|
0.00768903
km²
|
2
ac
|
0.00809372
km²
|
2.1
ac
|
0.00849841
km²
|
2.2
ac
|
0.00890309
km²
|
2.3
ac
|
0.00930778
km²
|
2.4
ac
|
0.00971246
km²
|
2.5
ac
|
0.0101172
km²
|
2.6
ac
|
0.0105218
km²
|
2.7
ac
|
0.0109265
km²
|
2.8
ac
|
0.0113312
km²
|
2.9
ac
|
0.0117359
km²
|
3
ac
|
0.0121406
km²
|
3.1
ac
|
0.0125453
km²
|
3.2
ac
|
0.01295
km²
|
3.3
ac
|
0.0133546
km²
|
3.4
ac
|
0.0137593
km²
|
3.5
ac
|
0.014164
km²
|
3.6
ac
|
0.0145687
km²
|
3.7
ac
|
0.0149734
km²
|
3.8
ac
|
0.0153781
km²
|
3.9
ac
|
0.0157828
km²
|
4
ac
|
0.0161874
km²
|
4.1
ac
|
0.0165921
km²
|
4.2
ac
|
0.0169968
km²
|
4.3
ac
|
0.0174015
km²
|
4.4
ac
|
0.0178062
km²
|
4.5
ac
|
0.0182109
km²
|
4.6
ac
|
0.0186156
km²
|
4.7
ac
|
0.0190202
km²
|
4.8
ac
|
0.0194249
km²
|
4.9
ac
|
0.0198296
km²
|
5
ac
|
0.0202343
km²
|
5.1
ac
|
0.020639
km²
|
5.2
ac
|
0.0210437
km²
|
5.3
ac
|
0.0214484
km²
|
5.4
ac
|
0.021853
km²
|
5.5
ac
|
0.0222577
km²
|
5.6
ac
|
0.0226624
km²
|
5.7
ac
|
0.0230671
km²
|
5.8
ac
|
0.0234718
km²
|
5.9
ac
|
0.0238765
km²
|
6
ac
|
0.0242812
km²
|
6.1
ac
|
0.0246858
km²
|
6.2
ac
|
0.0250905
km²
|
6.3
ac
|
0.0254952
km²
|
6.4
ac
|
0.0258999
km²
|
6.5
ac
|
0.0263046
km²
|
6.6
ac
|
0.0267093
km²
|
6.7
ac
|
0.027114
km²
|
6.8
ac
|
0.0275187
km²
|
6.9
ac
|
0.0279233
km²
|
7
ac
|
0.028328
km²
|
7.1
ac
|
0.0287327
km²
|
7.2
ac
|
0.0291374
km²
|
7.3
ac
|
0.0295421
km²
|
7.4
ac
|
0.0299468
km²
|
7.5
ac
|
0.0303515
km²
|
7.6
ac
|
0.0307561
km²
|
7.7
ac
|
0.0311608
km²
|
7.8
ac
|
0.0315655
km²
|
7.9
ac
|
0.0319702
km²
|
8
ac
|
0.0323749
km²
|
8.1
ac
|
0.0327796
km²
|
8.2
ac
|
0.0331843
km²
|
8.3
ac
|
0.0335889
km²
|
8.4
ac
|
0.0339936
km²
|
8.5
ac
|
0.0343983
km²
|
8.6
ac
|
0.034803
km²
|
8.7
ac
|
0.0352077
km²
|
8.8
ac
|
0.0356124
km²
|
8.9
ac
|
0.0360171
km²
|
9
ac
|
0.0364217
km²
|
9.1
ac
|
0.0368264
km²
|
9.2
ac
|
0.0372311
km²
|
9.3
ac
|
0.0376358
km²
|
9.4
ac
|
0.0380405
km²
|
9.5
ac
|
0.0384452
km²
|
9.6
ac
|
0.0388499
km²
|
9.7
ac
|
0.0392545
km²
|
9.8
ac
|
0.0396592
km²
|
9.9
ac
|
0.0400639
km²
|
10
ac
|
0.0404686
km²
|
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