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Converters
Inches to CM
One inch is exactly 2.54 centimetres. Multiply the inch measurement by 2.54 to get centimetres, which is the factor manufacturers print on dual-unit rulers.
1 in = 2.54 cm
How to use it
- Type a value in inches. The centimetres result updates immediately.
- Read the full factor under the result if you need to check the math by hand.
- Use the table for the values people look up most often.
- Open the reverse converter when you already have centimetres.
Formula
centimetres = inches × 2.54
Multiply by 2.54 exactly. A 12-inch foot is 30.48 centimetres, and that identity is exact, not rounded.
A 27-inch monitor, in centimetres
A display sold as 27 inches has a diagonal of 27 × 2.54 = 68.58 centimetres. The diagonal is the number in the name, not the width of the panel.
Use this when a US product sheet lists inches and you need metric for a European or Asian supplier, a 3D print, or a school lab. Six inches is 15.24 cm. Twelve inches is 30.48 cm. Sixty inches, a common desk height, is 152.4 cm. Because the factor is exact, converting to centimetres and back does not drift.
Common inches to cm values
| inches | centimetres |
|---|---|
| 1 in | 2.54 cm |
| 6 in | 15.24 cm |
| 12 in | 30.48 cm |
| 27 in | 68.58 cm |
| 36 in | 91.44 cm |
| 60 in | 152.4 cm |
Questions
How do I convert inches to centimetres?
Use centimetres = inches × 2.54. The converter applies that factor at full precision and rounds only what it displays.
Is this inches to cm factor exact?
Multiply by 2.54 exactly. A 12-inch foot is 30.48 centimetres, and that identity is exact, not rounded.
Is 1 inch exactly 2.54 cm?
Yes. The international yard and pound agreement of 1959 set the inch at exactly 25.4 millimetres, which is 2.54 centimetres.
Does ProHacks store the number I type?
No. The conversion runs in your browser. The value is not uploaded with the calculation.