How many centimeters are in an inch?

There are exactly 2.54 centimeters in one inch.

Is 10 cm equal to 4 inches?

Not exactly. 10 cm is 3.93701 inches, which is slightly less than 4 inches.

CM to Inches Converter

Convert length from centimeters (cm) to inches (in) instantly

Formula: inches = centimeters ÷ 2.54

Centimeters (cm)

Inches (in)

Quick Conversions

1 cm = 0.3937 in

2 cm = 0.7874 in

5 cm = 1.9685 in

10 cm = 3.937 in

15 cm = 5.906 in

20 cm = 7.874 in

30 cm = 11.811 in

50 cm = 19.685 in

CM to Inches Conversion Table

Centimeters (cm)	Inches (in)	Fraction
1	0.3937	≈ 3/8"
2	0.7874	≈ 13/16"
2.54	1.0000	1"
5	1.9685	≈ 2"
10	3.9370	≈ 4"
15	5.9055	≈ 6"
20	7.8740	≈ 8"
25	9.8425	≈ 10"
30	11.8110	≈ 12"
50	19.6850	≈ 20"
100	39.3701	≈ 39 3/8"

How to Convert Centimeters to Inches

Converting centimeters to inches is a common task when switching between the metric system and the US customary system. Since 1 inch is defined as exactly 2.54 centimeters, the conversion is straightforward.

The Formula

To convert from centimeters (cm) to inches (in), use the following formula:

Inches = Centimeters ÷ 2.54

Estimation Tip

If you don't have a calculator, you can multiply the centimeter value by 0.4 for a quick estimate. For example, 10 cm × 0.4 = 4 inches (the precise value is 3.937 inches).

Practical Applications

Display Sizes: TV and monitor screens are usually measured in inches, even in metric countries.
Fashion & Apparel: Waist sizes and inseams often use inches globally.
Construction: Many building materials and tools in the US are sized in inches.