Inches to Centimeters
Inches to centimeters converter: multiply by 2.54 (1 in = 2.54 cm). Includes a reference table, sample calculations and the inverse ratio 0.3937.
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The in to cm formula
This page converts inches (in) to centimeters (cm). In the converter's unit table, one inch equals 2.54 centimeters, so every result here comes from a single multiplication by 2.54.
The ratio works in both directions: multiply by 2.54 to go from inches to centimeters, or multiply by 0.39370079 to go from centimeters back to inches.
Quick lookup: inches in centimeters
This lookup list shows 12 in values and what they become in cm. The step from one row to the next is not constant, but the ratio of 2.54 between the columns is.
| Inches (in) | Centimeters (cm) |
|---|---|
| 0.5 | 1.27 |
| 1 | 2.54 |
| 2 | 5.08 |
| 5 | 12.7 |
| 10 | 25.4 |
| 20 | 50.8 |
| 25 | 63.5 |
| 50 | 127 |
| 100 | 254 |
| 250 | 635 |
| 500 | 1,270 |
| 1,000 | 2,540 |
Values in the cm column are shown the way the converter shows them, with a limited number of significant digits.
Worked examples for inches to centimeters
For the first example, take 42 inches. The factor is 2.54, so the amount comes to 106.68 centimeters.
Example 2. For a different size, 1.5 in, the result is 3.81 cm. Dividing 3.81 by 2.54 gets you back to about 1.5.
Going the opposite way, 240 centimeters comes to 94.48818898 inches using the inverse ratio 0.39370079.
The reverse: centimeters to inches
To start from centimeters instead, open Centimeters to Inches. For that direction 1 cm = 0.39370079 in, and its reference table is built around centimeters as the input.
For other combinations, the Length Converter offers every unit in one pair of dropdowns.
Other conversions in this family
These pages cover neighbouring unit pairs from the same converter.
Frequently asked questions
How many cm make up 1 in?
1 in = 2.54 cm in the converter's unit table. Multiplying by 10 gives 25.4 cm; multiplying by 100 gives 254 cm.
What is 1 cm in in?
One centimeter equals 0.39370079 inches. Ten centimeters equal 3.937007874 inches.
How do I convert 84 in to cm?
84 inches is 213.36 centimeters. The calculation is 84 multiplied by 2.54, rounded the way the widget rounds.
How does the converter round results?
The widget calculates with ordinary floating-point numbers and only rounds what it displays. Results of 1 or more show up to 10 significant digits, results below 1 show up to 8, and results from 1,000 upward show up to 6 decimal places with thousands separators. As an example, 0.123456789 in displays as 0.31358024 cm and 1,234.5678 in displays as 3,135.802212 cm.
Where does the in to cm result come from?
Behind the scenes, inches and centimeters are each tied to the same base unit by a stored factor. The ratio of those factors, 2.54, is what turns an in value into a cm value.
What is the reverse of in to cm?
Reversing the pair: multiply by 0.39370079, or equivalently divide by 2.54. The page titled "Centimeters to Inches" covers it, or you can press the swap button in the widget above. Example: 25 cm = 9.842519685 in.
Learn more from an authoritative source:
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