How many inches are in a centimeter?

There are 0.393701 inches in one centimeter. To convert centimeters to inches, multiply the number of centimeters by 0.393701 — or, equivalently, divide by 2.54.

How do I convert 30 centimeters to inches?

Multiply 30 by 0.393701: 30 centimeters is 11.81 inches.

Is an inch exactly 2.54 centimeters?

Yes. Since 1959 the international inch has been defined as exactly 2.54 cm, so converting between them involves no rounding beyond what you choose to display.

Centimeters to Inches

1 centimeter is 0.393701 inches.

To convert centimeters to inches, multiply the number of centimeters by 0.393701 — or, equivalently, divide by 2.54.
Going the other way, 1 inch is 2.54 centimeters.
For example, 30 centimeters is 11.81 inches.

Conversion

Common centimeters to inches conversions
Centimeters (cm)	Inches (in)
1	0.3937
2	0.7874
3	1.18
5	1.97
10	3.94
15	5.91
20	7.87
25	9.84
30	11.81
40	15.75
50	19.69
60	23.62
75	29.53
100	39.37
150	59.06
180	70.87

About centimeters and inches

The inch has been defined as exactly 2.54 centimeters since the 1959 international yard and pound agreement, so this conversion is exact, not an approximation. Screen sizes, paper, and clothing measurements cross between the two constantly.

Frequently asked questions

How many inches are in a centimeter?: There are 0.393701 inches in one centimeter. To convert centimeters to inches, multiply the number of centimeters by 0.393701 — or, equivalently, divide by 2.54.
How do I convert 30 centimeters to inches?: Multiply 30 by 0.393701: 30 centimeters is 11.81 inches.
Is an inch exactly 2.54 centimeters?: Yes. Since 1959 the international inch has been defined as exactly 2.54 cm, so converting between them involves no rounding beyond what you choose to display.