Length conversion
Inches to Centimetres (in to cm)
Turn an inch measurement from a photo, screen or product listing into centimetres. Check what was measured: a screen diagonal is not its width.
1 in = 2.54 cm — the calculator keeps the stored factor; this summary may be rounded.
The 6-inch side of a printed photo
- Starting measurement
- 6 in
- Converted value (rounded if needed)
- 15.24 cm
If both sides are given in inches, convert each side separately. This result describes only the side you entered.
Inches to Centimetres conversion chart
| inches | centimetres |
|---|---|
| 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 |
| 12 in | 30.48 cm |
| 15 in | 38.1 cm |
| 18 in | 45.72 cm |
| 20 in | 50.8 cm |
| 25 in | 63.5 cm |
| 30 in | 76.2 cm |
| 40 in | 101.6 cm |
| 50 in | 127 cm |
| 60 in | 152.4 cm |
| 75 in | 190.5 cm |
| 100 in | 254 cm |
How to convert by hand
Reference relationship (display may be rounded)
1 in = 2.54 cm
- Multiply the amount in inches by the number of centimetres per unit.
- Use the calculator for the stored precision; copying a short displayed factor introduces extra rounding.
- Round the result to suit your measurement, after completing the calculation.
Related conversions
About inches and centimetres
Convert each measured dimension separately. A width stays a width and a diagonal stays a diagonal; changing units does not turn a product’s nominal size into a measured size.
Inch
US / ImperialExactly 2.54 centimetres under the 1959 international yard agreement. The symbol is in; a double-prime mark is also used on drawings.
Commonly used for: Screen diagonals, picture sizes and dimensions on US product listings.
Centimetre
Metric (SI)One hundredth of a metre. Use centimetres for the measured length, not a clothing size number.
Commonly used for: Body measurements, paper widths and furniture dimensions.
Questions
Can I enter a fractional inch measurement?
Enter a decimal, such as 0.5 for half an inch or 6.5 for six and a half inches. The input does not evaluate a fraction written with a slash.
How do I convert centimetres back to inches?
Enter the value in the centimetres field above to work backwards, or open the Centimetres to Inches converter. This uses the stored factors rather than dividing by a rounded number copied from the chart.
Why might the chart and calculator show different decimal places?
The chart uses a compact rounded display. The editable calculator can show up to six decimal places and uses the factors or temperature formulas stored in the library. More displayed digits do not make the original measurement more precise.
Precision and source
The calculator uses stored conversion factors and temperature formulas, then rounds the result for display. A short decimal in a chart is not a claim of exactness. For a calculation with several steps, keep as much precision as the original measurement supports and round at the end.
Reference: NIST SP 811 conversion factors. Its alphabetical tables distinguish unit variants and temperature readings from intervals. Published by ToolsNow. Report a conversion problem.
Need a different unit?
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