Inches to Centimeters
Type inches (in), see centimeters (cm).
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How to convert inches to centimeters
To change inches into centimeters, multiply by 2.54.
centimeters = inches × 2.54
Going the other way: inches = centimeters × 0.393700787402
1 inch = 2.54 centimeters. This factor is the exact definition of the unit, not a rounded estimate.
Worked example
You have 12 inches. Multiply by 2.54. 12 × 2.54 = 30.48 cm.
Inches to centimeters conversion table
| Inches (in) | Centimeters (cm) |
|---|---|
| 1 in | 2.54 cm |
| 2 in | 5.08 cm |
| 3 in | 7.62 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 |
| 72 in | 182.88 cm |
This factor is exact
1 inch is exactly 2.54 cm. Since 1959 the inch has been defined in metric terms rather than measured against one, so this multiplication introduces no error at all — the only rounding is whatever you do to the answer afterwards.
Watch for fractional inches. A measurement written 5 3/8 in has to become 5.375 before you multiply; typing 5.38 is close but not the same number, and the error grows on a long run.
Screen and wheel sizes are diagonals and diameters respectively, not widths. A 27-inch monitor measures 68.58 cm corner to corner.
For heights given in feet and inches, turn the whole thing into inches first — 5 ft 10 in is 70 in — and convert once. Converting each part separately and adding them up invites a slip.
Frequently asked questions
How many cm is 12 inches?
12 inches, one foot, is exactly 30.48 cm.
How many cm is 1 inch?
Exactly 2.54 cm. This is a definition, not a rounded measurement.
What is 5 feet 10 inches in cm?
5 ft 10 in is 70 inches, which is exactly 177.8 cm.
How many cm is 6 inches?
6 inches is exactly 15.24 cm.
How do I convert a fraction like 3/8 of an inch?
Turn it into a decimal first: 3/8 is 0.375 in, which is 0.9525 cm.
How many cm is 24 inches?
24 inches, two feet, is exactly 60.96 cm.
Related converters
- Centimeters to Inches cm → in
- Feet to Centimeters ft → cm
- Feet to Meters ft → m
- All length converters How long or tall something is — feet, centimeters and meters.
Every factor on this page is listed in our conversion methodology.