Square Miles to Square Kilometers Converter

How to convert square miles to square kilometers

square kilometers = square miles × 2.589988110336

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

The factor 2.589988110336 is exact, not a rounded value. Nothing is rounded until you choose how many decimals to show.

Worked example: 10 mi²

1. Start with the value in square miles: 10 mi².
2. Multiply by 2.589988110336, because 1 square mile = 2.589988110336 square kilometers: 10 × 2.589988110336 = 25.89988110336 km².
3. Round to the precision you need: 25.90 km² to two decimals.

Square Miles and square kilometers side by side

Square Miles to square kilometers chart

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

Square Miles to square kilometers, part 1 of 4

mi²	km²
1	2.59
2	5.18
3	7.77
4	10.36
5	12.95
6	15.54
7	18.13
8	20.72
9	23.31
10	25.9
11	28.49
12	31.08
13	33.67
14	36.26
15	38.85
16	41.44
17	44.03
18	46.62
19	49.21
20	51.8
21	54.39
22	56.98
23	59.57
24	62.16
25	64.75

Square Miles to square kilometers, part 2 of 4

mi²	km²
26	67.34
27	69.93
28	72.52
29	75.11
30	77.7
31	80.29
32	82.88
33	85.47
34	88.06
35	90.65
36	93.24
37	95.83
38	98.42
39	101.01
40	103.6
41	106.19
42	108.78
43	111.37
44	113.96
45	116.55
46	119.14
47	121.73
48	124.32
49	126.91
50	129.5

Square Miles to square kilometers, part 3 of 4

mi²	km²
51	132.09
52	134.68
53	137.27
54	139.86
55	142.45
56	145.04
57	147.63
58	150.22
59	152.81
60	155.4
61	157.99
62	160.58
63	163.17
64	165.76
65	168.35
66	170.94
67	173.53
68	176.12
69	178.71
70	181.3
71	183.89
72	186.48
73	189.07
74	191.66
75	194.25

Square Miles to square kilometers, part 4 of 4

mi²	km²
76	196.84
77	199.43
78	202.02
79	204.61
80	207.2
81	209.79
82	212.38
83	214.97
84	217.56
85	220.15
86	222.74
87	225.33
88	227.92
89	230.51
90	233.1
91	235.69
92	238.28
93	240.87
94	243.46
95	246.05
96	248.64
97	251.23
98	253.82
99	256.41
100	259

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

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