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 “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.
| Acres | Ares |
|---|---|
0
ac
|
0
a
|
0.1
ac
|
4.04686
a
|
0.2
ac
|
8.09372
a
|
0.3
ac
|
12.14058
a
|
0.4
ac
|
16.18744
a
|
0.5
ac
|
20.2343
a
|
0.6
ac
|
24.28116
a
|
0.7
ac
|
28.32802
a
|
0.8
ac
|
32.37488
a
|
0.9
ac
|
36.42174
a
|
1
ac
|
40.4686
a
|
1.1
ac
|
44.51546
a
|
1.2
ac
|
48.56232
a
|
1.3
ac
|
52.60918
a
|
1.4
ac
|
56.65604
a
|
1.5
ac
|
60.70291
a
|
1.6
ac
|
64.74977
a
|
1.7
ac
|
68.79663
a
|
1.8
ac
|
72.84349
a
|
1.9
ac
|
76.89035
a
|
2
ac
|
80.93721
a
|
2.1
ac
|
84.98407
a
|
2.2
ac
|
89.03093
a
|
2.3
ac
|
93.07779
a
|
2.4
ac
|
97.12465
a
|
2.5
ac
|
101.17151
a
|
2.6
ac
|
105.21837
a
|
2.7
ac
|
109.26523
a
|
2.8
ac
|
113.31209
a
|
2.9
ac
|
117.35895
a
|
3
ac
|
121.40581
a
|
3.1
ac
|
125.45267
a
|
3.2
ac
|
129.49953
a
|
3.3
ac
|
133.54639
a
|
3.4
ac
|
137.59325
a
|
3.5
ac
|
141.64011
a
|
3.6
ac
|
145.68697
a
|
3.7
ac
|
149.73383
a
|
3.8
ac
|
153.78069
a
|
3.9
ac
|
157.82755
a
|
4
ac
|
161.87441
a
|
4.1
ac
|
165.92127
a
|
4.2
ac
|
169.96813
a
|
4.3
ac
|
174.01499
a
|
4.4
ac
|
178.06185
a
|
4.5
ac
|
182.10872
a
|
4.6
ac
|
186.15558
a
|
4.7
ac
|
190.20244
a
|
4.8
ac
|
194.2493
a
|
4.9
ac
|
198.29616
a
|
5
ac
|
202.34302
a
|
5.1
ac
|
206.38988
a
|
5.2
ac
|
210.43674
a
|
5.3
ac
|
214.4836
a
|
5.4
ac
|
218.53046
a
|
5.5
ac
|
222.57732
a
|
5.6
ac
|
226.62418
a
|
5.7
ac
|
230.67104
a
|
5.8
ac
|
234.7179
a
|
5.9
ac
|
238.76476
a
|
6
ac
|
242.81162
a
|
6.1
ac
|
246.85848
a
|
6.2
ac
|
250.90534
a
|
6.3
ac
|
254.9522
a
|
6.4
ac
|
259
a
|
6.5
ac
|
263.04592
a
|
6.6
ac
|
267.09278
a
|
6.7
ac
|
271.13964
a
|
6.8
ac
|
275.1865
a
|
6.9
ac
|
279.23336
a
|
7
ac
|
283.28022
a
|
7.1
ac
|
287.32708
a
|
7.2
ac
|
291.37394
a
|
7.3
ac
|
295.4208
a
|
7.4
ac
|
299.46767
a
|
7.5
ac
|
303.51453
a
|
7.6
ac
|
307.56139
a
|
7.7
ac
|
311.60825
a
|
7.8
ac
|
315.65511
a
|
7.9
ac
|
319.70197
a
|
8
ac
|
323.74883
a
|
8.1
ac
|
327.79569
a
|
8.2
ac
|
331.84255
a
|
8.3
ac
|
335.88941
a
|
8.4
ac
|
339.93627
a
|
8.5
ac
|
343.98313
a
|
8.6
ac
|
348.02999
a
|
8.7
ac
|
352.07685
a
|
8.8
ac
|
356.12371
a
|
8.9
ac
|
360.17057
a
|
9
ac
|
364.21743
a
|
9.1
ac
|
368.26429
a
|
9.2
ac
|
372.31115
a
|
9.3
ac
|
376.35801
a
|
9.4
ac
|
380.40487
a
|
9.5
ac
|
384.45173
a
|
9.6
ac
|
388.49859
a
|
9.7
ac
|
392.54545
a
|
9.8
ac
|
396.59231
a
|
9.9
ac
|
400.63917
a
|
10
ac
|
404.68603
a
|
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