inches to cm
Inches to Centimeters: cm = in × 2.54. Type a number and read the answer straight off the scale.
inches to cm chart of common values
| Inches | Centimeters |
|---|---|
| 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 |
| 7 in | 17.78 cm |
| 8 in | 20.32 cm |
| 9 in | 22.86 cm |
| 10 in | 25.4 cm |
| 11 in | 27.94 cm |
| 12 in | 30.48 cm |
| 13 in | 33.02 cm |
| 14 in | 35.56 cm |
| 15 in | 38.1 cm |
| 16 in | 40.64 cm |
| 17 in | 43.18 cm |
| 18 in | 45.72 cm |
| 19 in | 48.26 cm |
| 20 in | 50.8 cm |
| 25 in | 63.5 cm |
| 30 in | 76.2 cm |
| 35 in | 88.9 cm |
| 40 in | 101.6 cm |
| 45 in | 114.3 cm |
| 50 in | 127 cm |
| 60 in | 152.4 cm |
| 70 in | 177.8 cm |
| 75 in | 190.5 cm |
| 80 in | 203.2 cm |
| 90 in | 228.6 cm |
| 100 in | 254 cm |
| 120 in | 304.8 cm |
| 150 in | 381 cm |
| 200 in | 508 cm |
How to convert inches to centimeters
The formula
cm = in × 2.54. The factor is exact by definition, so the answer terminates.
Worked through for 12
Multiply 12 by 2.54. The result is 30.48 cm. Rounded, that is 30.48 cm.
In your head
Multiply by 2.5: 12 in → 30 cm (a little low; the exact answer is 30.48 cm).
Every inches to cm page
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Decimals
The other way: cm to inches.
Questions
What is the formula for inches to cm?
cm = in × 2.54. One inch is 2.54 centimeters.
How can I estimate it in my head?
Multiply by 2.5: 12 in → 30 cm (a little low; the exact answer is 30.48 cm).
Where do the conversion factors come from?
The pound and the inch were defined in metric units by the 1959 international yard and pound agreement: one pound is exactly 0.45359237 kg and one inch is exactly 2.54 cm.