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.
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.
Square Kilometers | Acres |
---|---|
0
km²
|
0
ac
|
0.1
km²
|
24.71051
ac
|
0.2
km²
|
49.42103
ac
|
0.3
km²
|
74.13154
ac
|
0.4
km²
|
98.84206
ac
|
0.5
km²
|
123.55257
ac
|
0.6
km²
|
148.26309
ac
|
0.7
km²
|
172.9736
ac
|
0.8
km²
|
197.68411
ac
|
0.9
km²
|
222.39463
ac
|
1
km²
|
247.10514
ac
|
1.1
km²
|
271.81566
ac
|
1.2
km²
|
296.52617
ac
|
1.3
km²
|
321.23669
ac
|
1.4
km²
|
345.9472
ac
|
1.5
km²
|
370.65771
ac
|
1.6
km²
|
395.36823
ac
|
1.7
km²
|
420.07874
ac
|
1.8
km²
|
444.78926
ac
|
1.9
km²
|
469.49977
ac
|
2
km²
|
494.21028
ac
|
2.1
km²
|
518.9208
ac
|
2.2
km²
|
543.63131
ac
|
2.3
km²
|
568.34183
ac
|
2.4
km²
|
593.05234
ac
|
2.5
km²
|
617.76286
ac
|
2.6
km²
|
642.47337
ac
|
2.7
km²
|
667.18388
ac
|
2.8
km²
|
691.8944
ac
|
2.9
km²
|
716.60491
ac
|
3
km²
|
741.31543
ac
|
3.1
km²
|
766.02594
ac
|
3.2
km²
|
790.73646
ac
|
3.3
km²
|
815.44697
ac
|
3.4
km²
|
840.15748
ac
|
3.5
km²
|
864.868
ac
|
3.6
km²
|
889.57851
ac
|
3.7
km²
|
914.28903
ac
|
3.8
km²
|
939
ac
|
3.9
km²
|
963.71006
ac
|
4
km²
|
988.42057
ac
|
4.1
km²
|
1013.13108
ac
|
4.2
km²
|
1037.8416
ac
|
4.3
km²
|
1062.55211
ac
|
4.4
km²
|
1087.26263
ac
|
4.5
km²
|
1111.97314
ac
|
4.6
km²
|
1136.68365
ac
|
4.7
km²
|
1161.39417
ac
|
4.8
km²
|
1186.10468
ac
|
4.9
km²
|
1210.8152
ac
|
5
km²
|
1235.52571
ac
|
5.1
km²
|
1260.23623
ac
|
5.2
km²
|
1284.94674
ac
|
5.3
km²
|
1309.65725
ac
|
5.4
km²
|
1334.36777
ac
|
5.5
km²
|
1359.07828
ac
|
5.6
km²
|
1383.7888
ac
|
5.7
km²
|
1408.49931
ac
|
5.8
km²
|
1433.20983
ac
|
5.9
km²
|
1457.92034
ac
|
6
km²
|
1482.63085
ac
|
6.1
km²
|
1507.34137
ac
|
6.2
km²
|
1532.05188
ac
|
6.3
km²
|
1556.7624
ac
|
6.4
km²
|
1581.47291
ac
|
6.5
km²
|
1606.18343
ac
|
6.6
km²
|
1630.89394
ac
|
6.7
km²
|
1655.60445
ac
|
6.8
km²
|
1680.31497
ac
|
6.9
km²
|
1705.02548
ac
|
7
km²
|
1729.736
ac
|
7.1
km²
|
1754.44651
ac
|
7.2
km²
|
1779.15702
ac
|
7.3
km²
|
1803.86754
ac
|
7.4
km²
|
1828.57805
ac
|
7.5
km²
|
1853.28857
ac
|
7.6
km²
|
1878
ac
|
7.7
km²
|
1902.7096
ac
|
7.8
km²
|
1927.42011
ac
|
7.9
km²
|
1952.13062
ac
|
8
km²
|
1976.84114
ac
|
8.1
km²
|
2001.55165
ac
|
8.2
km²
|
2026.26217
ac
|
8.3
km²
|
2050.97268
ac
|
8.4
km²
|
2075.6832
ac
|
8.5
km²
|
2100.39371
ac
|
8.6
km²
|
2125.10422
ac
|
8.7
km²
|
2149.81474
ac
|
8.8
km²
|
2174.52525
ac
|
8.9
km²
|
2199.23577
ac
|
9
km²
|
2223.94628
ac
|
9.1
km²
|
2248.6568
ac
|
9.2
km²
|
2273.36731
ac
|
9.3
km²
|
2298.07782
ac
|
9.4
km²
|
2322.78834
ac
|
9.5
km²
|
2347.49885
ac
|
9.6
km²
|
2372.20937
ac
|
9.7
km²
|
2396.91988
ac
|
9.8
km²
|
2421.63039
ac
|
9.9
km²
|
2446.34091
ac
|
10
km²
|
2471.05142
ac
|
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