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 “are” is a unit of area primarily used in land measurement, notably in countries employing the metric system. Introduced in France in 1795, it represents 100 square meters, making it a practical unit for comparing parcels of land. Interestingly, it’s the base unit for hectares, with one hectare equating to 100 ares or 10,000 square meters. While the are has been largely overshadowed by hectares in commercial and agricultural contexts, it remains a vital unit in some regions for surveying smaller plots. The persistence of the “are” in certain legal and cultural settings highlights how historical units can remain relevant despite broader shifts towards newer measurement systems.
Square Kilometers | Ares |
---|---|
0
km²
|
0
a
|
0.1
km²
|
1000
a
|
0.2
km²
|
2000
a
|
0.3
km²
|
3000
a
|
0.4
km²
|
4000
a
|
0.5
km²
|
5000
a
|
0.6
km²
|
6000
a
|
0.7
km²
|
7000
a
|
0.8
km²
|
8000
a
|
0.9
km²
|
9000
a
|
1
km²
|
10000
a
|
1.1
km²
|
11000
a
|
1.2
km²
|
12000
a
|
1.3
km²
|
13000
a
|
1.4
km²
|
14000
a
|
1.5
km²
|
15000
a
|
1.6
km²
|
16000
a
|
1.7
km²
|
17000
a
|
1.8
km²
|
18000
a
|
1.9
km²
|
19000
a
|
2
km²
|
20000
a
|
2.1
km²
|
21000
a
|
2.2
km²
|
22000
a
|
2.3
km²
|
23000
a
|
2.4
km²
|
24000
a
|
2.5
km²
|
25000
a
|
2.6
km²
|
26000
a
|
2.7
km²
|
27000
a
|
2.8
km²
|
28000
a
|
2.9
km²
|
29000
a
|
3
km²
|
30000
a
|
3.1
km²
|
31000
a
|
3.2
km²
|
32000
a
|
3.3
km²
|
33000
a
|
3.4
km²
|
34000
a
|
3.5
km²
|
35000
a
|
3.6
km²
|
36000
a
|
3.7
km²
|
37000
a
|
3.8
km²
|
38000
a
|
3.9
km²
|
39000
a
|
4
km²
|
40000
a
|
4.1
km²
|
41000
a
|
4.2
km²
|
42000
a
|
4.3
km²
|
43000
a
|
4.4
km²
|
44000
a
|
4.5
km²
|
45000
a
|
4.6
km²
|
46000
a
|
4.7
km²
|
47000
a
|
4.8
km²
|
48000
a
|
4.9
km²
|
49000
a
|
5
km²
|
50000
a
|
5.1
km²
|
51000
a
|
5.2
km²
|
52000
a
|
5.3
km²
|
53000
a
|
5.4
km²
|
54000
a
|
5.5
km²
|
55000
a
|
5.6
km²
|
56000
a
|
5.7
km²
|
57000
a
|
5.8
km²
|
58000
a
|
5.9
km²
|
59000
a
|
6
km²
|
60000
a
|
6.1
km²
|
61000
a
|
6.2
km²
|
62000
a
|
6.3
km²
|
63000
a
|
6.4
km²
|
64000
a
|
6.5
km²
|
65000
a
|
6.6
km²
|
66000
a
|
6.7
km²
|
67000
a
|
6.8
km²
|
68000
a
|
6.9
km²
|
69000
a
|
7
km²
|
70000
a
|
7.1
km²
|
71000
a
|
7.2
km²
|
72000
a
|
7.3
km²
|
73000
a
|
7.4
km²
|
74000
a
|
7.5
km²
|
75000
a
|
7.6
km²
|
76000
a
|
7.7
km²
|
77000
a
|
7.8
km²
|
78000
a
|
7.9
km²
|
79000
a
|
8
km²
|
80000
a
|
8.1
km²
|
81000
a
|
8.2
km²
|
82000
a
|
8.3
km²
|
83000
a
|
8.4
km²
|
84000
a
|
8.5
km²
|
85000
a
|
8.6
km²
|
86000
a
|
8.7
km²
|
87000
a
|
8.8
km²
|
88000
a
|
8.9
km²
|
89000
a
|
9
km²
|
90000
a
|
9.1
km²
|
91000
a
|
9.2
km²
|
92000
a
|
9.3
km²
|
93000
a
|
9.4
km²
|
94000
a
|
9.5
km²
|
95000
a
|
9.6
km²
|
96000
a
|
9.7
km²
|
97000
a
|
9.8
km²
|
98000
a
|
9.9
km²
|
99000
a
|
10
km²
|
100000
a
|
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