How many inches are in 1 centimeter?

1 cm equals 0.3937007874 in. This is an exact conversion factor defined by NIST.

How do I convert centimeters to inches?

Multiply the value in cm by the conversion factor. For example, 10 cm = 3.937007874 in. Use our calculator above for instant results.

Is the centimeters to inches conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert centimeters to inches offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between centimeters and inches?

Centimeters (cm) and Inches (in) are both units of length but belong to different measurement systems. 1 cm = 0.3937007874 in. Use the converter above to switch between them instantly.

Centimeters to Inches (cm → in) — Free Online Converter

cm → in Reference Table

cm	in
0.001 cm	0.0003937007874 in
0.002 cm	0.0007874015748 in
0.003 cm	0.001181102362 in
0.004 cm	0.00157480315 in
0.005 cm	0.001968503937 in
0.006 cm	0.002362204724 in
0.007 cm	0.002755905512 in
0.008 cm	0.003149606299 in
0.009 cm	0.003543307087 in
0.01 cm	0.003937007874 in
0.02 cm	0.007874015748 in
0.03 cm	0.01181102362 in
0.04 cm	0.0157480315 in
0.05 cm	0.01968503937 in
0.06 cm	0.02362204724 in
0.07 cm	0.02755905512 in
0.08 cm	0.03149606299 in
0.09 cm	0.03543307087 in
0.1 cm	0.03937007874 in
0.2 cm	0.07874015748 in
0.3 cm	0.1181102362 in
0.4 cm	0.157480315 in
0.5 cm	0.1968503937 in
0.6 cm	0.2362204724 in
0.7 cm	0.2755905512 in
0.8 cm	0.3149606299 in
0.9 cm	0.3543307087 in
1 cm	0.3937007874 in
1.5 cm	0.5905511811 in
2 cm	0.7874015748 in
2.5 cm	0.9842519685 in
3 cm	1.181102362 in
3.5 cm	1.377952756 in
4 cm	1.57480315 in
4.5 cm	1.771653543 in
5 cm	1.968503937 in
5.5 cm	2.165354331 in
6 cm	2.362204724 in
6.5 cm	2.559055118 in
7 cm	2.755905512 in
7.5 cm	2.952755906 in
8 cm	3.149606299 in
8.5 cm	3.346456693 in
9 cm	3.543307087 in
9.5 cm	3.74015748 in
10 cm	3.937007874 in
11 cm	4.330708661 in
12 cm	4.724409449 in
13 cm	5.118110236 in
14 cm	5.511811024 in
15 cm	5.905511811 in
16 cm	6.299212598 in
17 cm	6.692913386 in
18 cm	7.086614173 in
19 cm	7.480314961 in
20 cm	7.874015748 in
25 cm	9.842519685 in
30 cm	11.81102362 in
35 cm	13.77952756 in
40 cm	15.7480315 in
45 cm	17.71653543 in
50 cm	19.68503937 in
55 cm	21.65354331 in
60 cm	23.62204724 in
65 cm	25.59055118 in
70 cm	27.55905512 in
75 cm	29.52755906 in
80 cm	31.49606299 in
85 cm	33.46456693 in
90 cm	35.43307087 in
95 cm	37.4015748 in
100 cm	39.37007874 in
120 cm	47.24409449 in
125 cm	49.21259843 in
130 cm	51.18110236 in
140 cm	55.11811024 in
150 cm	59.05511811 in
160 cm	62.99212598 in
175 cm	68.8976378 in
180 cm	70.86614173 in
200 cm	78.74015748 in
225 cm	88.58267717 in
250 cm	98.42519685 in
275 cm	108.2677165 in
300 cm	118.1102362 in
350 cm	137.7952756 in
400 cm	157.480315 in
450 cm	177.1653543 in
500 cm	196.8503937 in
600 cm	236.2204724 in
700 cm	275.5905512 in
750 cm	295.2755906 in
800 cm	314.9606299 in
900 cm	354.3307087 in
1000 cm	393.7007874 in
1200 cm	472.4409449 in
1250 cm	492.1259843 in
1500 cm	590.5511811 in
1750 cm	688.976378 in
2000 cm	787.4015748 in
2500 cm	984.2519685 in
3000 cm	1181.102362 in
4000 cm	1574.80315 in
4500 cm	1771.653543 in
5000 cm	1968.503937 in
6000 cm	2362.204724 in
7000 cm	2755.905512 in
7500 cm	2952.755906 in
8000 cm	3149.606299 in
9000 cm	3543.307087 in
10000 cm	3937.007874 in
15000 cm	5905.511811 in
20000 cm	7874.015748 in
25000 cm	9842.519685 in
50000 cm	19685.03937 in
75000 cm	29527.55906 in
100000 cm	39370.07874 in

Values based on NIST SP 811 conversion factors

Real-World Examples

Carry-on luggage max height (55 cm)

55 cm = 21.65354331 in

Carry-on luggage max width (40 cm)

40 cm = 15.7480315 in

Carry-on luggage max depth (20 cm)

20 cm = 7.874015748 in

Average adult height (170 cm)

170 cm = 66.92913386 in

Standard dining table height

80 cm = 31.49606299 in

Why Convert Centimeters to Inches?

Converting between centimeters (cm) and inches (in) is one of the most common length conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert cm to in saves time and prevents errors.

Length conversions between cm and in are fundamental in construction, manufacturing, and international trade. Architects rely on precise conversions when adapting building plans between metric and imperial standards — a 1% error on a 30-meter wall translates to 30 cm of misalignment. Travelers frequently convert between kilometers and miles for road trips, while online shoppers need length conversions to verify clothing sizes, furniture dimensions, and screen diagonals across international retailers. In athletics, track distances (100m, 1500m, marathon) must be precisely converted for record comparisons across different measurement traditions.

How to Convert Centimeters to Inches

To convert centimeters to inches, use the following formula:

in = cm × 0.3937007874

Example: 1 cm = 0.3937007874 in

For example, 5 cm = 1.968503937 in, 10 cm = 3.937007874 in, and 100 cm = 39.37007874 in. For larger values, 1000 cm = 393.7007874 in. Conversely, 1 in = 2.54 cm. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Use Cases

Carry-on luggage max height (55 cm): 55 cm = 21.65354331 in
Carry-on luggage max width (40 cm): 40 cm = 15.7480315 in
Carry-on luggage max depth (20 cm): 20 cm = 7.874015748 in
Average adult height (170 cm): 170 cm = 66.92913386 in
Standard dining table height: 80 cm = 31.49606299 in

Common Mistakes to Avoid

Confusing similar units: confusing nautical miles with regular miles, or yards with meters.
Decimal errors: moving the decimal point the wrong way (e.g., 100 cm = 1 m, not 10 m).
Approximation: assuming an inch is exactly 2.5 cm (it's 2.54 cm).

Pro Tips

Use 'approx' for mental math: 1 km is roughly 0.6 miles (or 2/3 for quick estimates).
Visualize: A meter is about a guitar length; an inch is a thumb width.
Ruler check: Most rulers show cm and inches together—great for quick checks.

What is a Centimeter?

The centimeter (cm) is a metric unit of length equal to one-hundredth of a meter (0.01 m). It is part of the International System of Units (SI) and is defined based on the meter.

Centimeters are commonly used worldwide for everyday measurements where meters are too large, such as human height, furniture dimensions, and textile measurements.

What is a Inch?

The inch (in) is a unit of length in the Imperial and US customary systems. Historically defined as the width of a thumb or three barleycorns, it is now exactly defined as 25.4 millimeters (0.0254 meters) since 1959.

Inches are widely used in the US, UK, and Canada for short lengths. Common uses include screen sizes (TVs, monitors), pipe diameters, and paper sizes.

Centimeters → Inches

Centimeters to Inches Formula