Centimeters to Inches: Complete Conversion Chart

Introduction

Centimeters and inches are both units used to measure length. The centimeter belongs to the metric system and is used by most countries around the world, while the inch is the standard unit in the US customary system and is also used within the Imperial system.

This article explains exactly how to convert centimeters to inches, including the precise formula, a complete conversion chart from 1 cm to 100 cm, common cm-to-inch conversions, decimal centimeter conversions, and practical examples for height, screens, and everyday measurements. Whether you need a quick answer or a detailed reference chart, everything here is calculated for accuracy.

What Is a Centimeter?

A centimeter is a unit of length in the metric system, represented by the symbol cm. It is a small, practical unit used for everyday measurements such as the dimensions of objects, height, fabric, and packaging.

Key facts about the centimeter:

• Symbol: cm
• 1 centimeter = 0.01 meter
• 100 centimeters = 1 meter
• 1 centimeter = 10 millimeters

Because the centimeter is part of the metric system, it scales in units of ten, making it easy to convert to other metric lengths like millimeters and meters.

What Is an Inch?

An inch is a unit of length used primarily in the United States, and it also appears in the Imperial system used historically in the United Kingdom and other countries. Its symbol is in, and it is often marked with a double prime symbol (“) in casual writing.

Key facts about the inch:

• Symbol: in
• 1 inch = 2.54 centimeters exactly
• 1 inch = 25.4 millimeters exactly
• 12 inches = 1 foot

Inches are commonly used to describe product dimensions, screen sizes, tools, construction measurements, and everyday items in the United States.

How Many Inches Are in 1 Centimeter?

1 centimeter is equal to approximately 0.3937007874 inches.

This comes from the exact relationship between the two units:

1 inch = 2.54 centimeters exactly

So to find how many inches are in 1 centimeter, divide 1 by 2.54:

1 cm = 1 ÷ 2.54 ≈ 0.3937007874 inches

For everyday use, this is usually rounded to 0.39 inches, but it is important to remember that 0.39 is a rounded approximation, not the exact value.

Centimeters to Inches Formula

The formula for converting centimeters to inches is:

inches = centimeters ÷ 2.54

Or written more simply:

in = cm ÷ 2.54

Here, the centimeter value is divided by 2.54, since 2.54 is the exact number of centimeters in one inch. The result gives the equivalent length in inches, which can then be rounded to the level of precision needed.

Example: 10 cm ÷ 2.54 ≈ 3.937 inches

How to Convert Centimeters to Inches

Converting centimeters to inches follows a simple, repeatable process:

1. Start with the measurement in centimeters.
2. Divide the value by 2.54.
3. Round the result if necessary, based on the precision you need.
4. Add the unit “inches” to the final answer.

Example: Convert 25 cm to inches.

25 ÷ 2.54 ≈ 9.8425 inches

Rounded to two decimal places:

25 cm ≈ 9.84 inches

Complete Centimeters to Inches Conversion Chart (1 cm to 100 cm)

Below is a complete, accurate reference chart converting every centimeter value from 1 to 100 into inches, calculated using inches = centimeters ÷ 2.54.

Centimeters	Inches	Centimeters	Inches
1 cm	0.3937 in	51 cm	20.0787 in
2 cm	0.7874 in	52 cm	20.4724 in
3 cm	1.1811 in	53 cm	20.8661 in
4 cm	1.5748 in	54 cm	21.2598 in
5 cm	1.9685 in	55 cm	21.6535 in
6 cm	2.3622 in	56 cm	22.0472 in
7 cm	2.7559 in	57 cm	22.4409 in
8 cm	3.1496 in	58 cm	22.8346 in
9 cm	3.5433 in	59 cm	23.2283 in
10 cm	3.9370 in	60 cm	23.6220 in
11 cm	4.3307 in	61 cm	24.0157 in
12 cm	4.7244 in	62 cm	24.4094 in
13 cm	5.1181 in	63 cm	24.8031 in
14 cm	5.5118 in	64 cm	25.1969 in
15 cm	5.9055 in	65 cm	25.5906 in
16 cm	6.2992 in	66 cm	25.9843 in
17 cm	6.6929 in	67 cm	26.3780 in
18 cm	7.0866 in	68 cm	26.7717 in
19 cm	7.4803 in	69 cm	27.1654 in
20 cm	7.8740 in	70 cm	27.5591 in
21 cm	8.2677 in	71 cm	27.9528 in
22 cm	8.6614 in	72 cm	28.3465 in
23 cm	9.0551 in	73 cm	28.7402 in
24 cm	9.4488 in	74 cm	29.1339 in
25 cm	9.8425 in	75 cm	29.5276 in
26 cm	10.2362 in	76 cm	29.9213 in
27 cm	10.6299 in	77 cm	30.3150 in
28 cm	11.0236 in	78 cm	30.7087 in
29 cm	11.4173 in	79 cm	31.1024 in
30 cm	11.8110 in	80 cm	31.4961 in
31 cm	12.2047 in	81 cm	31.8898 in
32 cm	12.5984 in	82 cm	32.2835 in
33 cm	12.9921 in	83 cm	32.6772 in
34 cm	13.3858 in	84 cm	33.0709 in
35 cm	13.7795 in	85 cm	33.4646 in
36 cm	14.1732 in	86 cm	33.8583 in
37 cm	14.5669 in	87 cm	34.2520 in
38 cm	14.9606 in	88 cm	34.6457 in
39 cm	15.3543 in	89 cm	35.0394 in
40 cm	15.7480 in	90 cm	35.4331 in
41 cm	16.1417 in	91 cm	35.8268 in
42 cm	16.5354 in	92 cm	36.2205 in
43 cm	16.9291 in	93 cm	36.6142 in
44 cm	17.3228 in	94 cm	37.0079 in
45 cm	17.7165 in	95 cm	37.4016 in
46 cm	18.1102 in	96 cm	37.7953 in
47 cm	18.5039 in	97 cm	38.1890 in
48 cm	18.8976 in	98 cm	38.5827 in
49 cm	19.2913 in	99 cm	38.9764 in
50 cm	19.6850 in	100 cm	39.3701 in

Common Centimeters to Inches Conversion Chart

For quick reference, here are the most commonly searched centimeter-to-inch conversions:

Centimeters	Inches
1 cm	0.3937 in
2 cm	0.7874 in
5 cm	1.9685 in
10 cm	3.9370 in
15 cm	5.9055 in
20 cm	7.8740 in
25 cm	9.8425 in
30 cm	11.8110 in
40 cm	15.7480 in
50 cm	19.6850 in
60 cm	23.6220 in
70 cm	27.5591 in
80 cm	31.4961 in
90 cm	35.4331 in
100 cm	39.3701 in
120 cm	47.2441 in
150 cm	59.0551 in
160 cm	62.9921 in
170 cm	66.9291 in
175 cm	68.8976 in
180 cm	70.8661 in
190 cm	74.8031 in
200 cm	78.7402 in

Common Centimeter to Inch Conversions

1 cm to Inches

1 ÷ 2.54 ≈ 0.3937 inches

5 cm to Inches

5 ÷ 2.54 ≈ 1.9685 inches

10 cm to Inches

10 ÷ 2.54 ≈ 3.9370 inches

20 cm to Inches

20 ÷ 2.54 ≈ 7.8740 inches

25 cm to Inches

25 ÷ 2.54 ≈ 9.8425 inches

30 cm to Inches

30 ÷ 2.54 ≈ 11.8110 inches

50 cm to Inches

50 ÷ 2.54 ≈ 19.6850 inches

100 cm to Inches

100 ÷ 2.54 ≈ 39.3701 inches

Decimal Centimeters to Inches

Decimal centimeter values convert the same way as whole numbers, using the same formula:

inches = centimeters ÷ 2.54

Centimeters	Inches
2.5 cm	0.9843 in
5.5 cm	2.1654 in
7.5 cm	2.9528 in
10.5 cm	4.1339 in
12.5 cm	4.9213 in
15.5 cm	6.1024 in
25.5 cm	10.0394 in

Example: 7.5 cm ÷ 2.54 ≈ 2.9528 inches

Centimeters to Inches With Fractions

Inch measurements are often expressed as fractions rather than decimals, especially on rulers and measuring tapes. Some centimeter values convert to exact, whole fractional inches:

• 2.54 cm = 1 inch
• 5.08 cm = 2 inches
• 6.35 cm = 2.5 inches = 2 1/2 inches
• 12.7 cm = 5 inches

For most other centimeter measurements, the decimal inch result must be rounded to the nearest common fraction, such as 1/2, 1/4, 1/8, or 1/16 of an inch. For example, a decimal result of 2.95 inches is close to 3 inches, but on a ruler it would typically be rounded to the nearest 1/16 inch mark, which would be approximately 2 15/16 inches.

These fractional results are approximations unless the original decimal value already corresponds to an exact fraction. Always label a rounded fraction as approximate rather than exact.

Centimeters to Inches for Human Height

Height is one of the most common reasons people convert centimeters to inches. The process uses the same formula, and the result in inches can then be broken down into feet and remaining inches.

Example: Convert 170 cm to feet and inches.

170 ÷ 2.54 ≈ 66.93 inches

Since 1 foot = 12 inches, divide 66.93 by 12:

66.93 ÷ 12 ≈ 5 feet, with a remainder of 6.93 inches

So 170 cm is approximately 5 feet 6.93 inches.

Height in cm	Approx. inches	Approx. feet and inches
160 cm	62.99 in	5 ft 2.99 in
165 cm	64.96 in	5 ft 4.96 in
170 cm	66.93 in	5 ft 6.93 in
175 cm	68.90 in	5 ft 8.90 in
180 cm	70.87 in	5 ft 10.87 in
185 cm	72.83 in	6 ft 0.83 in
190 cm	74.80 in	6 ft 2.80 in

Important: The feet-and-inches figures above are not decimal feet. For example, 170 cm converts to 5 feet and 6.93 inches, not 5.6.93 feet. The number after “ft” refers to the remaining inches, not a decimal fraction of a foot.

Centimeters to Inches for Screen Sizes

Screen sizes, such as those for TVs, monitors, and phones, are measured diagonally from one corner of the screen to the opposite corner, not by width or height. When a screen size is given in centimeters, the converted inch value also represents this diagonal measurement only.

Screen size (cm)	Approx. diagonal (inches)
10 cm	3.94 in
15 cm	5.91 in
20 cm	7.87 in
25 cm	9.84 in
30 cm	11.81 in
32 cm	12.60 in
40 cm	15.75 in
50 cm	19.69 in
55 cm	21.65 in
60 cm	23.62 in
65 cm	25.59 in
75 cm	29.53 in
100 cm	39.37 in
120 cm	47.24 in
140 cm	55.12 in
150 cm	59.06 in
165 cm	64.96 in
190 cm	74.80 in

These values describe diagonal screen measurements only. They should not be used to estimate the actual width or height of a screen, since aspect ratio affects those dimensions separately.

Centimeters to Inches for Everyday Measurements

Converting centimeters to inches is useful in many everyday situations, including:

• Clothing measurements, such as sleeve length, waist size, or inseam
• Product dimensions for items purchased online from metric or US retailers
• Packaging and shipping, where box dimensions may be listed differently by region
• Furniture, when checking whether a piece will fit through a doorway or into a room
• Crafts and sewing, where patterns may use either unit
• DIY and home improvement projects involving materials cut to specific lengths
• Manufacturing and engineering, where tolerances often require precise unit conversion
• Construction, especially when working with international blueprints
• School projects, where students may need to convert between metric and US customary units
• Screen sizes, as covered above
• Human height, as covered above

Centimeters vs Inches

Feature	Centimeter	Inch
Symbol	cm	in
Measurement system	Metric	US customary / Imperial context
Relationship	1 cm ≈ 0.3937 in	1 in = 2.54 cm
Common uses	Metric measurements, most countries worldwide	US product dimensions and everyday measurements

The modern inch is defined identically within both the US customary system and the Imperial system, meaning it has the same exact length of 2.54 centimeters in either context.

Centimeters to Inches vs Inches to Centimeters

Converting between centimeters and inches works in two directions, and it is easy to mix them up if you are not careful about which way you are converting.

Centimeters to inches:

inches = centimeters ÷ 2.54

Inches to centimeters:

centimeters = inches × 2.54

Conversion direction	Formula	Example
cm to inches	in = cm ÷ 2.54	10 cm ÷ 2.54 ≈ 3.94 in
inches to cm	cm = in × 2.54	10 in × 2.54 = 25.4 cm

Reverse Conversion: Inches to Centimeters

Since centimeters to inches and inches to centimeters are inverse operations, it is useful to know the reverse formula as well:

centimeters = inches × 2.54

Example: Convert 10 inches to centimeters.

10 × 2.54 = 25.4 cm

Why Is 1 Inch Equal to 2.54 Centimeters?

The international inch is defined exactly as 2.54 centimeters. This definition was standardized so that the inch, used in US customary and Imperial measurements, aligns precisely with the metric system, making conversions between the two consistent and exact rather than approximate.

Rounding Centimeter to Inch Conversions

When you divide centimeters by 2.54, the result often includes many decimal places. For example:

10 cm = 3.937007874… inches

Depending on how the result will be used, it is common to round it:

3.937007874… inches rounds to 3.94 inches

Different situations call for different levels of precision:

• 1 decimal place is often enough for general, everyday use.
• 2 decimal places work well for most practical measurements, such as clothing or product dimensions.
• More decimal places are appropriate for technical, engineering, or scientific calculations where accuracy matters more.

When performing multi-step calculations, avoid rounding too early, since rounding intermediate results can introduce small errors that grow larger through subsequent steps. Round only at the final step.

Centimeters to Inches Conversion Examples

Example 1

Convert 5 cm to inches. 5 ÷ 2.54 ≈ 1.9685 inches

Example 2

Convert 10 cm to inches. 10 ÷ 2.54 ≈ 3.9370 inches

Example 3

Convert 15 cm to inches. 15 ÷ 2.54 ≈ 5.9055 inches

Example 4

Convert 20 cm to inches. 20 ÷ 2.54 ≈ 7.8740 inches

Example 5

Convert 25 cm to inches. 25 ÷ 2.54 ≈ 9.8425 inches

Example 6

Convert 50 cm to inches. 50 ÷ 2.54 ≈ 19.6850 inches

Example 7

Convert 100 cm to inches. 100 ÷ 2.54 ≈ 39.3701 inches

Example 8

Convert 175 cm to inches. 175 ÷ 2.54 ≈ 68.8976 inches

Common Centimeter to Inch Conversion Mistakes

• Multiplying by 2.54 instead of dividing. Multiplying converts inches to centimeters, not the other way around. Centimeters to inches always requires division.
• Using 2.5 instead of 2.54. Rounding the conversion factor itself introduces unnecessary error, especially over larger measurements.
• Forgetting the unit. A number without “in” or “cm” attached can easily be misread or misapplied.
• Rounding too early in multi-step calculations. This can compound small errors into larger inaccuracies.
• Confusing centimeters with millimeters. There are 10 millimeters in 1 centimeter, so mixing these up leads to results that are off by a factor of 10.
• Confusing inches with feet. Since 12 inches equal 1 foot, forgetting this relationship can cause height and length errors.
• Confusing decimal inches with feet-and-inches notation. A value like 5 ft 6.93 in is not the same as 5.6.93 feet or 5.69 feet.
• Treating a screen’s diagonal size as its width. Screen sizes measured in inches or centimeters refer to the diagonal, not the width or height.
• Using a rounded conversion factor when exact precision is required. For technical work, always use the full formula with 2.54 rather than a shortcut approximation.

Common Questions About Centimeters to Inches