Home › Unit Converters › Square KM to Square Miles Converter

Square KM to Square Miles Converter

A quick two-way km² ⇄ sq mi converter: type in either box, choose how many decimals you want and copy the answer with one click.

Square kilometersFrom

km²

Square milesTo

sq mi

Decimal places

Step-by-step calculation

How to use the Square KM to Square Miles Converter

Type a value in the Square kilometers box. The square miles result appears instantly.
Going the other way? Type in the Square miles box, or press the ⇄ swap button.
Set the precision with the decimal places menu.
Check the working in the step-by-step box, then press Copy result or click any row in the tables below.

Square kilometers to square miles formula

sq mi = km² ÷ 2.58998811

Take the value in square kilometers.
Divide it by 2.58998811 (the number of square kilometers in one square mile).

Example: 1 km² ÷ 2.58998811 = 0.386102 sq mi.

Reverse formula (square miles to square kilometers): km² = sq mi × 2.58998811. Example: 38.6102 sq mi × 2.58998811 = 100 km².

Quick mental estimate: divide by about 2.6. For exact answers use the converter above.

km² to sq mi conversion table (1–100)

Click any row to load it into the converter.

Square kilometers to square miles

Square kilometers	Square miles
1 km²	0.386 sq mi
2 km²	0.772 sq mi
3 km²	1.158 sq mi
4 km²	1.544 sq mi
5 km²	1.931 sq mi
6 km²	2.317 sq mi
7 km²	2.703 sq mi
8 km²	3.089 sq mi
9 km²	3.475 sq mi
10 km²	3.861 sq mi
11 km²	4.247 sq mi
12 km²	4.633 sq mi
13 km²	5.019 sq mi
14 km²	5.405 sq mi
15 km²	5.792 sq mi
16 km²	6.178 sq mi
17 km²	6.564 sq mi
18 km²	6.95 sq mi
19 km²	7.336 sq mi
20 km²	7.722 sq mi
21 km²	8.108 sq mi
22 km²	8.494 sq mi
23 km²	8.88 sq mi
24 km²	9.266 sq mi
25 km²	9.653 sq mi
26 km²	10.039 sq mi
27 km²	10.425 sq mi
28 km²	10.811 sq mi
29 km²	11.197 sq mi
30 km²	11.583 sq mi
31 km²	11.969 sq mi
32 km²	12.355 sq mi
33 km²	12.741 sq mi
34 km²	13.127 sq mi
35 km²	13.514 sq mi
36 km²	13.9 sq mi
37 km²	14.286 sq mi
38 km²	14.672 sq mi
39 km²	15.058 sq mi
40 km²	15.444 sq mi
41 km²	15.83 sq mi
42 km²	16.216 sq mi
43 km²	16.602 sq mi
44 km²	16.988 sq mi
45 km²	17.375 sq mi
46 km²	17.761 sq mi
47 km²	18.147 sq mi
48 km²	18.533 sq mi
49 km²	18.919 sq mi
50 km²	19.305 sq mi
51 km²	19.691 sq mi
52 km²	20.077 sq mi
53 km²	20.463 sq mi
54 km²	20.85 sq mi
55 km²	21.236 sq mi
56 km²	21.622 sq mi
57 km²	22.008 sq mi
58 km²	22.394 sq mi
59 km²	22.78 sq mi
60 km²	23.166 sq mi
61 km²	23.552 sq mi
62 km²	23.938 sq mi
63 km²	24.324 sq mi
64 km²	24.711 sq mi
65 km²	25.097 sq mi
66 km²	25.483 sq mi
67 km²	25.869 sq mi
68 km²	26.255 sq mi
69 km²	26.641 sq mi
70 km²	27.027 sq mi
71 km²	27.413 sq mi
72 km²	27.799 sq mi
73 km²	28.185 sq mi
74 km²	28.572 sq mi
75 km²	28.958 sq mi
76 km²	29.344 sq mi
77 km²	29.73 sq mi
78 km²	30.116 sq mi
79 km²	30.502 sq mi
80 km²	30.888 sq mi
81 km²	31.274 sq mi
82 km²	31.66 sq mi
83 km²	32.046 sq mi
84 km²	32.433 sq mi
85 km²	32.819 sq mi
86 km²	33.205 sq mi
87 km²	33.591 sq mi
88 km²	33.977 sq mi
89 km²	34.363 sq mi
90 km²	34.749 sq mi
91 km²	35.135 sq mi
92 km²	35.521 sq mi
93 km²	35.908 sq mi
94 km²	36.294 sq mi
95 km²	36.68 sq mi
96 km²	37.066 sq mi
97 km²	37.452 sq mi
98 km²	37.838 sq mi
99 km²	38.224 sq mi
100 km²	38.61 sq mi

Square miles to square kilometers

Square miles	Square kilometers
1 sq mi	2.59 km²
2 sq mi	5.18 km²
3 sq mi	7.77 km²
4 sq mi	10.36 km²
5 sq mi	12.95 km²
6 sq mi	15.54 km²
7 sq mi	18.13 km²
8 sq mi	20.72 km²
9 sq mi	23.31 km²
10 sq mi	25.9 km²
11 sq mi	28.49 km²
12 sq mi	31.08 km²
13 sq mi	33.67 km²
14 sq mi	36.26 km²
15 sq mi	38.85 km²
16 sq mi	41.44 km²
17 sq mi	44.03 km²
18 sq mi	46.62 km²
19 sq mi	49.21 km²
20 sq mi	51.8 km²
21 sq mi	54.39 km²
22 sq mi	56.98 km²
23 sq mi	59.57 km²
24 sq mi	62.16 km²
25 sq mi	64.75 km²
26 sq mi	67.34 km²
27 sq mi	69.93 km²
28 sq mi	72.52 km²
29 sq mi	75.11 km²
30 sq mi	77.7 km²
31 sq mi	80.29 km²
32 sq mi	82.88 km²
33 sq mi	85.47 km²
34 sq mi	88.06 km²
35 sq mi	90.65 km²
36 sq mi	93.24 km²
37 sq mi	95.83 km²
38 sq mi	98.42 km²
39 sq mi	101.01 km²
40 sq mi	103.6 km²
41 sq mi	106.19 km²
42 sq mi	108.78 km²
43 sq mi	111.369 km²
44 sq mi	113.959 km²
45 sq mi	116.549 km²
46 sq mi	119.139 km²
47 sq mi	121.729 km²
48 sq mi	124.319 km²
49 sq mi	126.909 km²
50 sq mi	129.499 km²
51 sq mi	132.089 km²
52 sq mi	134.679 km²
53 sq mi	137.269 km²
54 sq mi	139.859 km²
55 sq mi	142.449 km²
56 sq mi	145.039 km²
57 sq mi	147.629 km²
58 sq mi	150.219 km²
59 sq mi	152.809 km²
60 sq mi	155.399 km²
61 sq mi	157.989 km²
62 sq mi	160.579 km²
63 sq mi	163.169 km²
64 sq mi	165.759 km²
65 sq mi	168.349 km²
66 sq mi	170.939 km²
67 sq mi	173.529 km²
68 sq mi	176.119 km²
69 sq mi	178.709 km²
70 sq mi	181.299 km²
71 sq mi	183.889 km²
72 sq mi	186.479 km²
73 sq mi	189.069 km²
74 sq mi	191.659 km²
75 sq mi	194.249 km²
76 sq mi	196.839 km²
77 sq mi	199.429 km²
78 sq mi	202.019 km²
79 sq mi	204.609 km²
80 sq mi	207.199 km²
81 sq mi	209.789 km²
82 sq mi	212.379 km²
83 sq mi	214.969 km²
84 sq mi	217.559 km²
85 sq mi	220.149 km²
86 sq mi	222.739 km²
87 sq mi	225.329 km²
88 sq mi	227.919 km²
89 sq mi	230.509 km²
90 sq mi	233.099 km²
91 sq mi	235.689 km²
92 sq mi	238.279 km²
93 sq mi	240.869 km²
94 sq mi	243.459 km²
95 sq mi	246.049 km²
96 sq mi	248.639 km²
97 sq mi	251.229 km²
98 sq mi	253.819 km²
99 sq mi	256.409 km²
100 sq mi	258.999 km²

Common values

Square kilometers	Square miles	Example
1 km²	0.39 sq mi	1 km²
2.59 km²	1 sq mi	1 square mile
10 km²	3.86 sq mi	10 km²
100 km²	38.61 sq mi	100 km²
1,000 km²	386.1 sq mi	1,000 km²
10,000 km²	3,861.02 sq mi	10,000 km²

About square kilometers and square miles

Square kilometers (km²). A square kilometer is the area of a square 1 km on each side: 1,000,000 m² or 100 hectares.

Square miles (sq mi). A square mile is the area of a square one mile on each side: 640 acres or about 2.59 km².

Frequently asked questions

1 square kilometer equals how many square miles?

One square kilometer equals 0.386102 square miles. Looking at it the other way, one square mile is 2.58999 square kilometers.

How do you convert square kilometers to square miles?

Divide the number of square kilometers by 2.58998811. For example, 1 km² ÷ 2.58998811 = 0.386102 sq mi.

What is 100 square kilometers in square miles?

100 km² is 38.6102 sq mi.

How do I convert square miles back to square kilometers?

Multiply by 2.58998811, or press the ⇄ swap button above. For example, 38.6102 sq mi × 2.58998811 = 100 km².

Why is the square-mile factor not 1.609?

Because area squares the length factor: 1 mile = 1.609 km, so 1 square mile = 1.609² = 2.59 km².

Is this converter free and private?

Yes. It is free with no sign-up, and every calculation runs in your browser, so nothing you type is sent to a server.

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