Inches to Cm

How to convert inches to centimetres

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

The formula

To go from inches to centimetres, multiply by 2.54, since one inch is exactly 2.54 centimetres. So 12 inches becomes 12 times 2.54, which is 30.48 centimetres. That is why a one foot ruler is a little over 30 centimetres.

When you need this

TV and monitor sizes, tyre sizes, and US measurements come in inches, while most forms and rulers outside the US use centimetres. A 55 inch TV is about 140 centimetres across the screen. A 32 inch waist is about 81 centimetres. This page makes the swap without the math.

Feet to centimetres

If you have feet and inches, turn the feet into inches first by multiplying by 12, then add the extra inches, then convert. So 5 feet 9 inches is 69 inches, which is about 175 centimetres, a common adult height.

FAQ

How many centimetres is 1 inch?

Exactly 2.54 centimetres. This is a fixed definition.

What is 12 inches in centimetres?

30.48 centimetres, a little over 30. That is one foot.

How do I convert my height from feet and inches?

Turn it all into inches first: feet times 12, plus the extra inches. Then multiply by 2.54. For 6 feet, that is 72 inches, or about 183 centimetres.

Is the conversion exact?

Yes. One inch is defined as 2.54 centimetres, so the math is exact and only the display is trimmed.

Is anything sent to a server?

No. The conversion runs in your browser and nothing is stored.

How do I convert inches to centimeters by hand?

Multiply by 2.54. The in to cm rule is exact: one inch equals 2.54 centimetres, so 10 inches is 25.4 cm.