How 1 in becomes 2.54 cm
Multiply the inches by 2.54. With 1 in plugged in, the formula cm = in × 2.54 reads like this:
The factor between inches and centimeters never changes, so the same step works for any number.
Inches to CM near 1 in
| Inches (in) | Centimeters (cm) |
|---|---|
| 0.5 in | 1.27 cm |
| 1 in | 2.54 cm |
| 1.5 in | 3.81 cm |
| 2 in | 5.08 cm |
| 2.5 in | 6.35 cm |
| 3 in | 7.62 cm |
| 3.5 in | 8.89 cm |
| 4 in | 10.16 cm |
| 4.5 in | 11.43 cm |
| 5 in | 12.7 cm |
Values are rounded to six decimals below 1, four decimals up to 1,000 and two decimals above. The converter above shows more digits.
2.54 cm back to inches
The other way round, 2.54 cm is 1 in: 2.54 ÷ 2.54 = 1 in. The CM to Inches converter does this for any number.
More Inches to CM values
Any other number? The Inches to CM converter has a chart of common values, and the Length Converter handles every length unit at once.
Frequently asked questions
How many centimeters is 1 in?
1 inch is exactly 2.54 centimeters.
What is the formula for 1 Inches to CM?
Multiply by 2.54: 1 × 2.54 = 2.54 cm.
What is 1.5 in in centimeters?
1.5 inches is 3.81 centimeters, which is 1.27 cm more than 1 in.
How do I get from 2.54 cm back to inches?
Run the formula the other way: 2.54 ÷ 2.54 = 1 in. Divide by 2.54, and you are back at 1 in.