Area Calculator

How big is 1 Square Miles? What is 1 Square Miles in Acres? This area calculator will allow you to easily convert 1 sq mi to ac.

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1 Square Miles = 639.99943412918 Acres

1 Square Miles is equal to 639.99943412918 Acres

Square Miles

(Abbreviations: sq mi, mi²,mi^2)

A square mile is equal to the area of a square with sides of one mile (mi) in length. Square miles are used to measure large land areas, such as the size of states, counties, or national parks.

Acres

(Abbreviations: ac)

An acre is a unit of area commonly used in the United States, United Kingdom, and other countries for measuring land. It is equivalent to 43,560 square feet, or about 4,047 square meters. Historically, an acre was defined as the area of land a yoke of oxen could plow in a single day.One acre is approximately 0.405 hectares or 1/640 of a square mile.

Square Miles to Acres Conversions

Square Miles	Acres
1	639.99943412918
2	1279.9988682584
3	1919.9983023875
4	2559.9977365167
5	3199.9971706459
6	3839.9966047751
7	4479.9960389042
8	5119.9954730334
9	5759.9949071626
10	6399.9943412918
11	7039.9937754209
12	7679.9932095501
13	8319.9926436793
14	8959.9920778085
15	9599.9915119376
16	10239.990946067
17	10879.990380196
18	11519.989814325
19	12159.989248454
20	12799.988682584
21	13439.988116713
22	14079.987550842
23	14719.986984971
24	15359.9864191
25	15999.985853229
26	16639.985287359
27	17279.984721488
28	17919.984155617
29	18559.983589746
30	19199.983023875

Square Miles	Acres
31	19839.982458004
32	20479.981892134
33	21119.981326263
34	21759.980760392
35	22399.980194521
36	23039.97962865
37	23679.97906278
38	24319.978496909
39	24959.977931038
40	25599.977365167
41	26239.976799296
42	26879.976233425
43	27519.975667555
44	28159.975101684
45	28799.974535813
46	29439.973969942
47	30079.973404071
48	30719.9728382
49	31359.97227233
50	31999.971706459
51	32639.971140588
52	33279.970574717
53	33919.970008846
54	34559.969442976
55	35199.968877105
56	35839.968311234
57	36479.967745363
58	37119.967179492
59	37759.966613621
60	38399.966047751

Most Frequently Used Area Unit Conversions:

Metric:

Square Meters (m²) to Square Centimeters (cm²)
Square Meters (m²) to Square Millimeters (mm²)
Square Kilometers (km²) to Hectares (ha)
Hectares (ha) to Square Meters (m²)
Square Meters (m²) to Square Decimeters (dm²)

Imperial/US Customary:

Square Feet (ft²) to Square Inches (in²)
Square Yards (yd²) to Square Feet (ft²)
Acres (ac) to Square Feet (ft²)
Acres (ac) to Square Yards (yd²)
Square Miles (mi²) to Acres (ac)

Common Metric-Imperial Conversions:

Square Meters (m²) to Square Feet (ft²)
Square Feet (ft²) to Square Meters (m²)
Acres (ac) to Hectares (ha)
Hectares (ha) to Acres (ac)

Less Common but Useful:

Square Miles (mi²) to Square Kilometers (km²)
Square Kilometers (km²) to Square Miles (mi²)
Square Yards (yd²) to Square Meters (m²)