Inches to Centimeters Converter

By Inch To Cm Converter Editorial Team·August 31, 2026·2 min read

One inch is exactly 2.54 centimetres – not a rounded figure, but the legal definition agreed internationally in 1959. So to go from inches to centimetres you multiply by 2.54, and to go back you divide. The converter above does both as you type; the rest of this page is for when you want to understand or sanity-check the number.

What common inch measurements look like in cm

Numbers are easier to trust when you can picture them. A credit card is 3.37 in (8.56 cm) on its long edge. A sheet of A4 paper is 8.27 in (21.0 cm) wide. An iPhone 15 stands 5.81 in (14.76 cm) tall, and a 65-inch TV panel measures about 57 in (145 cm) across. If your result lands wildly outside the range those anchors suggest, you have probably multiplied where you should have divided.

Inches to centimetres table

Inches	Centimetres	Rough real-world match
1 in	2.54 cm	width of an AA battery plus a bit
2 in	5.08 cm	diameter of a golf ball plus a hair
5 in	12.7 cm	height of a soda can, near enough
12 in	30.48 cm	a one-foot ruler
24 in	60.96 cm	width of a 27-inch monitor
65 in	165.1 cm	the diagonal of a 65-inch TV

Where the inch-to-cm gap trips people up

The classic mistake is treating a person’s height as a single number. Someone who is “5 foot 9” is not 5.9 feet – they are 5 feet plus 9 inches, which is 69 inches, or 175.3 cm. Convert the feet and the inches together, or use the inches to feet converter first. The other common slip is screen sizes: a “24-inch monitor” is 24 inches on the diagonal, so the width in cm is quite a bit less than 24 × 2.54.

For anything beyond a few metres, jump to the all-in-one length converter, and to flip the direction there is the mm to inches converter.

FAQ

How do I convert inches to cm?

Multiply the number of inches by 2.54. For example, 10 inches × 2.54 = 25.4 cm. To go the other way, divide centimetres by 2.54.

Is 1 inch exactly 2.54 cm?

Yes. Since 1959 the inch has been defined as exactly 2.54 centimetres by the international yard and pound agreement. There is no rounding in the factor itself.

How many cm is 5 feet 9 inches?

5 ft 9 in is 69 inches. 69 × 2.54 = 175.26 cm, usually written as about 175 cm.

Why is my screen smaller in cm than 2.54 times the inches?

Screen sizes are the diagonal measurement. A 24-inch screen is 24 inches corner to corner, so its width and height in centimetres are each less than 24 × 2.54.

How do I convert cm back to inches?

Divide the centimetre value by 2.54. For instance, 100 cm ÷ 2.54 = 39.37 inches. The converter above does this if you type in the cm field.