How do I convert centimeters to inches?

Divide the number of centimeters by 2.54. For example, 10 cm / 2.54 = 3.94 inches, and 50 cm / 2.54 = 19.69 inches. To convert inches to centimeters, multiply by 2.54 instead.

What is 30 cm in inches?

30 cm equals 11.81 inches, because 30 / 2.54 = 11.81. A 30 cm ruler is very close to a 12-inch ruler, which is exactly 30.48 cm.

What is 12 inches in cm?

12 inches equals exactly 30.48 cm, because 1 inch is exactly 2.54 cm and 12 x 2.54 = 30.48. This is the standard 1-foot length.

Published September 5, 2026

cm to inches conversion table (1-100 cm)

Every conversion from 1 to 100 centimeters to inches, computed with the exact rule: 1 inch = 2.54 cm. Bookmark this table, or use the online ruler, which shows centimeters and inches on the same scale so no conversion is ever needed.

cm	inches	cm	inches	cm	inches	cm	inches
1	0.39	26	10.24	51	20.08	76	29.92
2	0.79	27	10.63	52	20.47	77	30.31
3	1.18	28	11.02	53	20.87	78	30.71
4	1.57	29	11.42	54	21.26	79	31.10
5	1.97	30	11.81	55	21.65	80	31.50
6	2.36	31	12.20	56	22.05	81	31.89
7	2.76	32	12.60	57	22.44	82	32.28
8	3.15	33	12.99	58	22.83	83	32.68
9	3.54	34	13.39	59	23.23	84	33.07
10	3.94	35	13.78	60	23.62	85	33.46
11	4.33	36	14.17	61	24.02	86	33.86
12	4.72	37	14.57	62	24.41	87	34.25
13	5.12	38	14.96	63	24.80	88	34.65
14	5.51	39	15.35	64	25.20	89	35.04
15	5.91	40	15.75	65	25.59	90	35.43
16	6.30	41	16.14	66	25.98	91	35.83
17	6.69	42	16.54	67	26.38	92	36.22
18	7.09	43	16.93	68	26.77	93	36.61
19	7.48	44	17.32	69	27.17	94	37.01
20	7.87	45	17.72	70	27.56	95	37.40
21	8.27	46	18.11	71	27.95	96	37.80
22	8.66	47	18.50	72	28.35	97	38.19
23	9.06	48	18.90	73	28.74	98	38.58
24	9.45	49	19.29	74	29.13	99	38.98
25	9.84	50	19.69	75	29.53	100	39.37

Common ruler sizes in inches and cm

Ruler	cm	inches
6-inch ruler	15.24	6
12-inch ruler	30.48	12
30 cm ruler	30	11.81
A4 width	21	8.27
Credit card	8.56	3.37

The rule behind the table

One inch is defined as exactly 2.54 centimeters (international standard). To convert cm to inches, divide by 2.54; to convert inches to cm, multiply by 2.54. The table above rounds to two decimals, which is precise enough for everyday measuring - and for a real-size online ruler, the conversion is built in.

Ready to measure? Open the online ruler, calibrate it once against a credit card, and start measuring in cm, mm, or inches.

cm to inches conversion table (1-100 cm)

Common ruler sizes in inches and cm

The rule behind the table

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