Length conversion
Inches to Centimetres (in to cm)
1 in = 2.54 cm — multiply the number of inches by 2.54.
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
1 in = 2.54 cm
Because this is a linear conversion, the ratio never changes: every inche is always 2.54 cm, whatever the size of the number.
Worked example: 10 in × 2.54 = 25.4 cm .
Related conversions
About inches and centimetres
Length conversions come up constantly when a product is specified in one system and you think in the other — screen sizes in inches, running distances in kilometres, height in feet.
Inch
US / ImperialDefined as exactly 2.54 centimetres since the 1959 international yard agreement.
Commonly used for: Screen sizes, tyre diameters and US construction.
Centimetre
Metric (SI)One hundredth of a metre.
Commonly used for: Body measurements, paper sizes and everyday lengths almost everywhere outside the United States.
Questions
How many centimetres are in one inche?
One inche equals 2.54 cm. To convert any amount, multiply the number of inches by 2.54.
What is 5 in in cm?
5 in = 12.7 cm. Type any value into the converter above to get an exact answer.
How do I convert centimetres back to inches?
Divide by 2.54 instead of multiplying — or use our Centimetres to Inches converter.
Is this converter accurate?
Yes. Linear conversions use the internationally agreed factors published by NIST (SP 811), and temperature conversions use the exact defining formulas. Calculations run at full double precision and are only rounded for display.
Need a different unit?
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