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 mile, a unit of area unique to imperial and U.S. customary systems, is often associated with vast expanses of land, particularly in regions like the United States and Canada. Historically used to map territories and cities, the square mile encompasses an area equivalent to 640 acres. One particularly fascinating application of the square mile is in city planning: Manhattan, one of the world’s most densely populated areas, covers about 22.7 square miles yet houses over a million residents!
Another interesting aspect is the “square mile of influence”: cities like London have financial districts, each around one square mile, that wield immense global economic power. These districts, often referred to simply as “The City,” play crucial roles in shaping world markets, showing how a single square mile can be the epicenter of international financial activity.
| Acres | Square Miles |
|---|---|
0
ac
|
0
mi²
|
0.1
ac
|
0.00015625
mi²
|
0.2
ac
|
0.0003125
mi²
|
0.3
ac
|
0.00046875
mi²
|
0.4
ac
|
0.000625
mi²
|
0.5
ac
|
0.00078125
mi²
|
0.6
ac
|
0.0009375
mi²
|
0.7
ac
|
0.00109375
mi²
|
0.8
ac
|
0.00125
mi²
|
0.9
ac
|
0.00140625
mi²
|
1
ac
|
0.0015625
mi²
|
1.1
ac
|
0.00171875
mi²
|
1.2
ac
|
0.001875
mi²
|
1.3
ac
|
0.00203125
mi²
|
1.4
ac
|
0.0021875
mi²
|
1.5
ac
|
0.00234375
mi²
|
1.6
ac
|
0.0025
mi²
|
1.7
ac
|
0.00265625
mi²
|
1.8
ac
|
0.0028125
mi²
|
1.9
ac
|
0.00296875
mi²
|
2
ac
|
0.003125
mi²
|
2.1
ac
|
0.00328125
mi²
|
2.2
ac
|
0.0034375
mi²
|
2.3
ac
|
0.00359375
mi²
|
2.4
ac
|
0.00375
mi²
|
2.5
ac
|
0.00390625
mi²
|
2.6
ac
|
0.0040625
mi²
|
2.7
ac
|
0.00421875
mi²
|
2.8
ac
|
0.004375
mi²
|
2.9
ac
|
0.00453125
mi²
|
3
ac
|
0.0046875
mi²
|
3.1
ac
|
0.00484375
mi²
|
3.2
ac
|
0.005
mi²
|
3.3
ac
|
0.00515625
mi²
|
3.4
ac
|
0.0053125
mi²
|
3.5
ac
|
0.00546875
mi²
|
3.6
ac
|
0.005625
mi²
|
3.7
ac
|
0.00578125
mi²
|
3.8
ac
|
0.0059375
mi²
|
3.9
ac
|
0.00609375
mi²
|
4
ac
|
0.00625
mi²
|
4.1
ac
|
0.00640625
mi²
|
4.2
ac
|
0.0065625
mi²
|
4.3
ac
|
0.00671875
mi²
|
4.4
ac
|
0.006875
mi²
|
4.5
ac
|
0.00703125
mi²
|
4.6
ac
|
0.0071875
mi²
|
4.7
ac
|
0.00734375
mi²
|
4.8
ac
|
0.0075
mi²
|
4.9
ac
|
0.00765625
mi²
|
5
ac
|
0.0078125
mi²
|
5.1
ac
|
0.00796875
mi²
|
5.2
ac
|
0.008125
mi²
|
5.3
ac
|
0.00828125
mi²
|
5.4
ac
|
0.0084375
mi²
|
5.5
ac
|
0.00859375
mi²
|
5.6
ac
|
0.00875
mi²
|
5.7
ac
|
0.00890625
mi²
|
5.8
ac
|
0.0090625
mi²
|
5.9
ac
|
0.00921875
mi²
|
6
ac
|
0.009375
mi²
|
6.1
ac
|
0.00953125
mi²
|
6.2
ac
|
0.0096875
mi²
|
6.3
ac
|
0.00984375
mi²
|
6.4
ac
|
0.01
mi²
|
6.5
ac
|
0.0101562
mi²
|
6.6
ac
|
0.0103125
mi²
|
6.7
ac
|
0.0104687
mi²
|
6.8
ac
|
0.010625
mi²
|
6.9
ac
|
0.0107812
mi²
|
7
ac
|
0.0109375
mi²
|
7.1
ac
|
0.0110937
mi²
|
7.2
ac
|
0.01125
mi²
|
7.3
ac
|
0.0114062
mi²
|
7.4
ac
|
0.0115625
mi²
|
7.5
ac
|
0.0117187
mi²
|
7.6
ac
|
0.011875
mi²
|
7.7
ac
|
0.0120312
mi²
|
7.8
ac
|
0.0121875
mi²
|
7.9
ac
|
0.0123437
mi²
|
8
ac
|
0.0125
mi²
|
8.1
ac
|
0.0126562
mi²
|
8.2
ac
|
0.0128125
mi²
|
8.3
ac
|
0.0129687
mi²
|
8.4
ac
|
0.013125
mi²
|
8.5
ac
|
0.0132812
mi²
|
8.6
ac
|
0.0134375
mi²
|
8.7
ac
|
0.0135937
mi²
|
8.8
ac
|
0.01375
mi²
|
8.9
ac
|
0.0139062
mi²
|
9
ac
|
0.0140625
mi²
|
9.1
ac
|
0.0142187
mi²
|
9.2
ac
|
0.014375
mi²
|
9.3
ac
|
0.0145312
mi²
|
9.4
ac
|
0.0146875
mi²
|
9.5
ac
|
0.0148437
mi²
|
9.6
ac
|
0.015
mi²
|
9.7
ac
|
0.0151562
mi²
|
9.8
ac
|
0.0153125
mi²
|
9.9
ac
|
0.0154687
mi²
|
10
ac
|
0.015625
mi²
|
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