Square Kilometers to Square Miles Converter

How to convert square kilometers to square miles

square miles = square kilometers ÷ 2.589988110336

1 square kilometer is 1,000,000 square meters. 1 square mile is 640 acres, exactly 2,589,988.110336 square meters.

Dividing by 2.589988110336 is exact. Written as a multiplication the factor is a repeating decimal, 1 km² = 0.3861021585424… mi², so a rounded multiplier such as 0.3861 is slightly off. This converter keeps the exact fraction (244140625/632321316) and rounds only the result it shows.

Worked example: 10 km²

1. Start with the value in square kilometers: 10 km².
2. Divide by 2.589988110336, because 1 square mile = 2.589988110336 square kilometers: 10 ÷ 2.589988110336 = 3.861021585….
3. Round to the precision you need: 3.86 mi² to two decimals.

Square Kilometers and square miles side by side

Square Kilometers to square miles chart

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Square kilometers from 1 to 100 converted to square miles with the exact factor, shown to five significant digits.

Square Kilometers to square miles, part 1 of 4

km²	mi²
1	0.3861
2	0.7722
3	1.1583
4	1.5444
5	1.9305
6	2.3166
7	2.7027
8	3.0888
9	3.4749
10	3.861
11	4.2471
12	4.6332
13	5.0193
14	5.4054
15	5.7915
16	6.1776
17	6.5637
18	6.9498
19	7.3359
20	7.722
21	8.1081
22	8.4942
23	8.8803
24	9.2665
25	9.6526

Square Kilometers to square miles, part 2 of 4

km²	mi²
26	10.039
27	10.425
28	10.811
29	11.197
30	11.583
31	11.969
32	12.355
33	12.741
34	13.127
35	13.514
36	13.9
37	14.286
38	14.672
39	15.058
40	15.444
41	15.83
42	16.216
43	16.602
44	16.988
45	17.375
46	17.761
47	18.147
48	18.533
49	18.919
50	19.305

Square Kilometers to square miles, part 3 of 4

km²	mi²
51	19.691
52	20.077
53	20.463
54	20.85
55	21.236
56	21.622
57	22.008
58	22.394
59	22.78
60	23.166
61	23.552
62	23.938
63	24.324
64	24.711
65	25.097
66	25.483
67	25.869
68	26.255
69	26.641
70	27.027
71	27.413
72	27.799
73	28.185
74	28.572
75	28.958

Square Kilometers to square miles, part 4 of 4

km²	mi²
76	29.344
77	29.73
78	30.116
79	30.502
80	30.888
81	31.274
82	31.66
83	32.046
84	32.433
85	32.819
86	33.205
87	33.591
88	33.977
89	34.363
90	34.749
91	35.135
92	35.521
93	35.908
94	36.294
95	36.68
96	37.066
97	37.452
98	37.838
99	38.224
100	38.61

square miles = square kilometers ÷ 2.589988110336. Factors: NIST Handbook 44, BIPM SI Brochure, NIST U.S. survey foot. unitcheck.net/area/square-kilometers-to-square-miles/

Going the other way? Use the Square Miles to Square Kilometers converter.