Seldons
inches to cm
1 inch = 2.54 centimeters.
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How do you convert inches to centimeters?
Use this formula. It is exact — these units are defined by international agreement, not measured.
cm = in × 2.54
Example: 10 in × 2.54 = 25.4 cm.
inches to cm conversion table
Common values, rounded to six significant figures.
| in | cm |
|---|---|
| 1 in | 2.54 cm |
| 2 in | 5.08 cm |
| 3 in | 7.62 cm |
| 4 in | 10.16 cm |
| 5 in | 12.7 cm |
| 6 in | 15.24 cm |
| 8 in | 20.32 cm |
| 10 in | 25.4 cm |
| 12 in | 30.48 cm |
| 15 in | 38.1 cm |
| 18 in | 45.72 cm |
| 24 in | 60.96 cm |
| 30 in | 76.2 cm |
| 36 in | 91.44 cm |
| 48 in | 121.92 cm |
| 60 in | 152.4 cm |
| 72 in | 182.88 cm |
Clothing sizes, screen diagonals and furniture dimensions cross this line constantly, because catalogues in the US quote inches while the rest of the world reads centimeters. An inch is exactly 2.54 cm by definition, so a 27-inch monitor is exactly 68.58 cm — the awkward decimals are real, not rounding artifacts.
Values worth remembering
These come up often enough that knowing them saves a lookup.
- 12 in = 30.48 cmone foot
- 8.5 in = 21.59 cmUS Letter width
- 11 in = 27.94 cmUS Letter height
Questions people ask
How many centimeters is 1 inch?
1 inch is 2.54 centimeters.
How many inches is 1 centimeter?
1 centimeter is 0.393701 inches.
How do you convert inches to centimeters in your head?
Use × 2.5. That lands within a percent or so of the exact figure, which is close enough for packing, shipping estimates and shopping — use the calculator when the number has to be right.
Is the inch to centimeter conversion exact?
Yes. The relationship is exact by international agreement, so 2.54 is a definition rather than a measurement. Rounding in the answer comes from display, not from the conversion.