Inches to Centimeters
Convert inches to centimeters instantly. Change the amount or check the formula below.
More actions
Multiply in by 2.54 to get cm.
Same value in other units View equivalents
| Unit | Equivalent value |
|---|---|
| Meters (m) | 0.127 m |
| Feet (ft) | 0.416667 ft |
| Centimeters (cm) | 12.7 cm |
| Millimeters (mm) | 127 mm |
| Kilometers (km) | 0.000127 km |
How to convert in to cm
Multiply in by 2.54 to get cm.
Enter your value in the converter. The displayed result updates immediately. All math is performed in your browser. You can use the copy function to save a result or share a linked example with a colleague.
Quick reference table
Choose a value below to try it in the live converter.
| Inches | Centimeters |
|---|---|
| 2.54 cm | |
| 5.08 cm | |
| 12.7 cm | |
| 25.4 cm | |
| 63.5 cm | |
| 127 cm | |
| 254 cm |
Results use the length dimension. Choose compatible units only; the precision selector changes display rounding, not the underlying factor.
Verify in to cm
Using the stated definitions, 1 in = 2.54 cm and 10 in = 25.4 cm. The live converter accepts your own value; the table provides additional check points.
Conversion method
Multiply in by 2.54 to get cm.
International foot and inch definitions
The international inch is exactly 0.0254 meter and the international foot is exactly 0.3048 meter. For construction plans or survey data, verify which foot standard the source uses.
Length measurements are one-dimensional. Do not reuse a length factor for square feet or cubic feet: those units require squared or cubed factors.
Need the other direction? Convert cm to in.
Reference: NIST conversion factors. Calculation and display rounding are separate. See how we calculate.
Fractional inches to metric lengths
Inch ruler marks are exact fractions, not decimal-looking measurements.
| Inches on a ruler | Millimeters | Centimeters |
|---|---|---|
| 1/16 in | 1.5875 mm | 0.15875 cm |
| 1/8 in | 3.175 mm | 0.3175 cm |
| 1/4 in | 6.35 mm | 0.635 cm |
| 1/2 in | 12.7 mm | 1.27 cm |
| 1 in | 25.4 mm | 2.54 cm |
One international inch is exactly 25.4 mm. A fraction such as 1/8 inch is 0.125 inch, not 0.8 inch.
Worked inches to centimeters examples
Check these calculated examples, or enter a different number in the live converter. Displayed decimals may be rounded; the calculation uses the underlying unit definition.
| Original value | Converted result |
|---|---|
| 17.7 in | = 44.958 cm |
Practical questions: inches to centimeters
What is 17.7 inches in centimeters?
17.7 in = 44.958 cm. The inch-to-centimeter factor is exact; a reported measurement can still have limited precision.
Should the 2.54 cm-per-inch factor be rounded?
No. One international inch is defined as exactly 2.54 centimeters. Round only the displayed result to suit your measurement.
Need another compatible unit? convert inches to millimeters. Check definitions and rounding.
Specific in values
Direct, shareable results for documented search queries.
Methodology: fixed SI definitions and standards-based factors. For safety-critical use, verify the required industry specification. Check definitions, conventions and sources.