Inches to Centimeters Converter

How to convert inches to centimeters

centimeters = inches × 2.54

1 inch is exactly 25.4 millimeters. 1 centimeter is one hundredth of a meter (SI prefix centi, 10⁻²).

The factor 2.54 is exact, not a rounded value. Nothing is rounded until you choose how many decimals to show.

Worked example: 8.5 in

1. Start with the value in inches: 8.5 in.
2. Multiply by 2.54, because 1 inch = 2.54 centimeters: 8.5 × 2.54 = 21.59 cm.

Inches and centimeters side by side

Inches to centimeters chart

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Inches from 1 to 100 converted to centimeters with the exact factor, shown to five significant digits.

Inches to centimeters, part 1 of 4

in	cm
1	2.54
2	5.08
3	7.62
4	10.16
5	12.7
6	15.24
7	17.78
8	20.32
9	22.86
10	25.4
11	27.94
12	30.48
13	33.02
14	35.56
15	38.1
16	40.64
17	43.18
18	45.72
19	48.26
20	50.8
21	53.34
22	55.88
23	58.42
24	60.96
25	63.5

Inches to centimeters, part 2 of 4

in	cm
26	66.04
27	68.58
28	71.12
29	73.66
30	76.2
31	78.74
32	81.28
33	83.82
34	86.36
35	88.9
36	91.44
37	93.98
38	96.52
39	99.06
40	101.6
41	104.14
42	106.68
43	109.22
44	111.76
45	114.3
46	116.84
47	119.38
48	121.92
49	124.46
50	127

Inches to centimeters, part 3 of 4

in	cm
51	129.54
52	132.08
53	134.62
54	137.16
55	139.7
56	142.24
57	144.78
58	147.32
59	149.86
60	152.4
61	154.94
62	157.48
63	160.02
64	162.56
65	165.1
66	167.64
67	170.18
68	172.72
69	175.26
70	177.8
71	180.34
72	182.88
73	185.42
74	187.96
75	190.5

Inches to centimeters, part 4 of 4

in	cm
76	193.04
77	195.58
78	198.12
79	200.66
80	203.2
81	205.74
82	208.28
83	210.82
84	213.36
85	215.9
86	218.44
87	220.98
88	223.52
89	226.06
90	228.6
91	231.14
92	233.68
93	236.22
94	238.76
95	241.3
96	243.84
97	246.38
98	248.92
99	251.46
100	254

Fractions of an inch in decimals and millimeters

Every value is exact: 1 inch is 25.4 mm by definition.

Inch fractions in decimals and millimeters, part 1 of 2

Fraction	Decimal in	mm
1/16 in	0.0625	1.5875
1/8 in	0.125	3.175
3/16 in	0.1875	4.7625
1/4 in	0.25	6.35
5/16 in	0.3125	7.9375
3/8 in	0.375	9.525
7/16 in	0.4375	11.1125
1/2 in	0.5	12.7

Inch fractions in decimals and millimeters, part 2 of 2

Fraction	Decimal in	mm
9/16 in	0.5625	14.2875
5/8 in	0.625	15.875
11/16 in	0.6875	17.4625
3/4 in	0.75	19.05
13/16 in	0.8125	20.6375
7/8 in	0.875	22.225
15/16 in	0.9375	23.8125
1 in	1	25.4

centimeters = inches × 2.54. Factors: NIST SP 811, NIST Handbook 44, BIPM SI Brochure. unitcheck.net/length/inches-to-centimeters/

Common values

Going the other way? Use the Centimeters to Inches converter.