Cm to Inches

Convert centimetres to inches, with the formula and a table of common lengths.

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How to convert centimetres to inches

  1. Type the length in centimetres.
  2. The value in inches shows right away.
  3. Check the table below for common lengths.
  4. Change the number to convert another value.

The formula

To go from centimetres to inches, divide by 2.54, since one inch is exactly 2.54 centimetres. So 30 centimetres becomes 30 divided by 2.54, which is about 11.8 inches. Dividing by 2.54 is the same as multiplying by 0.3937.

When you need this

Screen sizes, paper sizes, and heights often switch between the two systems. A laptop measured as 34 centimetres wide is about 13.4 inches. A4 paper, at 21 by 29.7 centimetres, is about 8.3 by 11.7 inches. A height of 170 centimetres is about 67 inches, which is 5 feet 7 inches. This page turns centimetres into inches in one step.

From inches to feet

For heights, you often want feet and inches. Convert to inches here, then divide by 12 for the feet and keep the remainder as inches. So 180 centimetres is about 70.9 inches, which is 5 feet and about 11 inches.

FAQ

How many inches is 1 centimetre?

About 0.3937 inches. Put another way, it takes 2.54 centimetres to make one inch.

What is 30 cm in inches?

About 11.8 inches, close to a standard 12 inch ruler.

How do I turn centimetres into feet and inches?

Convert to inches, then divide by 12 for feet and keep the leftover as inches. For 165 cm, that is about 65 inches, or 5 feet 5 inches.

Is the conversion exact?

The definition is exact: one inch is 2.54 centimetres. Only the shown decimals are trimmed.

Is my data private?

Yes. The conversion runs in your browser and nothing is saved.

How do I convert cm to inches by hand?

Divide by 2.54, because one inch is exactly 2.54 centimetres. So to convert cm quickly: 100 centimeters to inches is 100 divided by 2.54, which is 39.37.