Utilonic
Utilonic

Centimetres to Inches Converter

Convert centimetres (cm) to inches (in) instantly using our free online converter. Type any value in centimetres and get the exact inch equivalent — updated as you type. You can also type in the inches field to convert back to centimetres.

Formula:[value] cm ÷ 2.54 = [result] in

How to convert Centimetres to Inches

cm ÷ 2.54 = in

For example: 25 cm ÷ 2.54 = 9.843 in

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Common Centimetres to Inches conversions

Common Centimetres to Inches conversions
Centimetres (cm)Inches (in)
1 cm0.3937 in
2 cm0.7874 in
5 cm1.969 in
10 cm3.937 in
15 cm5.906 in
20 cm7.874 in
25 cm9.843 in
30 cm11.81 in
40 cm15.75 in
50 cm19.69 in
60 cm23.62 in
70 cm27.56 in
80 cm31.5 in
90 cm35.43 in
100 cm39.37 in
150 cm59.06 in
180 cm70.87 in
200 cm78.74 in

About this conversion

The centimetre to inches conversion is one of the most common metric-to-imperial unit conversions, used daily for height measurement, screen sizes, clothing, and DIY projects. One centimetre equals exactly 0.3937 inches, and conversely one inch equals exactly 2.54 centimetres — a relationship defined by international agreement in 1959. The formula is straightforward: divide the centimetre value by 2.54 to get inches. For example, a 170 cm person is about 5 feet 7 inches tall; a 27-inch monitor is 68.58 cm wide; and a standard A4 sheet of paper (21 cm wide) is approximately 8.27 inches. Whether you are shopping internationally, reading technical specifications, or converting a recipe, this converter delivers the exact answer instantly.

Frequently asked questions

How many inches is 1 cm?+
1 centimetre equals 0.3937 inches — roughly 3/8 of an inch. This is because 1 inch is defined as exactly 2.54 centimetres, so 1 ÷ 2.54 = 0.3937.
How do I convert cm to inches without a calculator?+
A quick mental shortcut: multiply the centimetres by 0.4 (or divide by 2.5). For example, 10 cm × 0.4 = 4 inches (exact answer is 3.937). This is accurate to within 1.6%, which is fine for everyday estimates.
Is 5 cm the same as 2 inches?+
Not quite. 5 cm equals 1.969 inches — just under 2 inches. Conversely, 2 inches equals 5.08 cm. For most practical purposes they are close enough to treat as equal.
What is 170 cm in feet and inches?+
170 cm equals approximately 5 feet 6.93 inches, usually written as 5′7″. To work it out: 170 ÷ 2.54 = 66.93 inches, then 66.93 ÷ 12 = 5 feet with 6.93 inches remaining.
Why do some countries use inches and others use centimetres?+
The United States, Liberia and Myanmar still primarily use the imperial system (feet and inches) for everyday measurement. Most other countries adopted the metric system (centimetres, metres) during the 19th and 20th centuries because it is based on powers of ten, making calculations easier. Both systems are equally valid — conversion between them is exact.