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.
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.
| Ares | Acres |
|---|---|
0
a
|
0
ac
|
1
a
|
0.0247105
ac
|
2
a
|
0.049421
ac
|
3
a
|
0.0741315
ac
|
4
a
|
0.0988421
ac
|
5
a
|
0.123553
ac
|
6
a
|
0.148263
ac
|
7
a
|
0.172974
ac
|
8
a
|
0.197684
ac
|
9
a
|
0.222395
ac
|
10
a
|
0.247105
ac
|
11
a
|
0.271816
ac
|
12
a
|
0.296526
ac
|
13
a
|
0.321237
ac
|
14
a
|
0.345947
ac
|
15
a
|
0.370658
ac
|
16
a
|
0.395368
ac
|
17
a
|
0.420079
ac
|
18
a
|
0.444789
ac
|
19
a
|
0.4695
ac
|
20
a
|
0.49421
ac
|
21
a
|
0.518921
ac
|
22
a
|
0.543631
ac
|
23
a
|
0.568342
ac
|
24
a
|
0.593052
ac
|
25
a
|
0.617763
ac
|
26
a
|
0.642473
ac
|
27
a
|
0.667184
ac
|
28
a
|
0.691894
ac
|
29
a
|
0.716605
ac
|
30
a
|
0.741315
ac
|
31
a
|
0.766026
ac
|
32
a
|
0.790736
ac
|
33
a
|
0.815447
ac
|
34
a
|
0.840157
ac
|
35
a
|
0.864868
ac
|
36
a
|
0.889579
ac
|
37
a
|
0.914289
ac
|
38
a
|
0.939
ac
|
39
a
|
0.96371
ac
|
40
a
|
0.988421
ac
|
41
a
|
1.01313
ac
|
42
a
|
1.03784
ac
|
43
a
|
1.06255
ac
|
44
a
|
1.08726
ac
|
45
a
|
1.11197
ac
|
46
a
|
1.13668
ac
|
47
a
|
1.16139
ac
|
48
a
|
1.1861
ac
|
49
a
|
1.21082
ac
|
50
a
|
1.23553
ac
|
51
a
|
1.26024
ac
|
52
a
|
1.28495
ac
|
53
a
|
1.30966
ac
|
54
a
|
1.33437
ac
|
55
a
|
1.35908
ac
|
56
a
|
1.38379
ac
|
57
a
|
1.4085
ac
|
58
a
|
1.43321
ac
|
59
a
|
1.45792
ac
|
60
a
|
1.48263
ac
|
61
a
|
1.50734
ac
|
62
a
|
1.53205
ac
|
63
a
|
1.55676
ac
|
64
a
|
1.58147
ac
|
65
a
|
1.60618
ac
|
66
a
|
1.63089
ac
|
67
a
|
1.6556
ac
|
68
a
|
1.68031
ac
|
69
a
|
1.70503
ac
|
70
a
|
1.72974
ac
|
71
a
|
1.75445
ac
|
72
a
|
1.77916
ac
|
73
a
|
1.80387
ac
|
74
a
|
1.82858
ac
|
75
a
|
1.85329
ac
|
76
a
|
1.878
ac
|
77
a
|
1.90271
ac
|
78
a
|
1.92742
ac
|
79
a
|
1.95213
ac
|
80
a
|
1.97684
ac
|
81
a
|
2.00155
ac
|
82
a
|
2.02626
ac
|
83
a
|
2.05097
ac
|
84
a
|
2.07568
ac
|
85
a
|
2.10039
ac
|
86
a
|
2.1251
ac
|
87
a
|
2.14981
ac
|
88
a
|
2.17453
ac
|
89
a
|
2.19924
ac
|
90
a
|
2.22395
ac
|
91
a
|
2.24866
ac
|
92
a
|
2.27337
ac
|
93
a
|
2.29808
ac
|
94
a
|
2.32279
ac
|
95
a
|
2.3475
ac
|
96
a
|
2.37221
ac
|
97
a
|
2.39692
ac
|
98
a
|
2.42163
ac
|
99
a
|
2.44634
ac
|
100
a
|
2.47105
ac
|
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