Use the exact 2.54 factor
One inch is exactly 2.54 centimetres, so intermediate rounding is unnecessary.
Unit converter
Inches to CM Converter
Convert inches to centimetres instantly. Inches and product sizing. See the formula, worked examples and practical reference values.
How to convert in to cm
Inches to centimetres helps compare screen sizes, clothing measurements and product specifications with measurements stated in metric units.
Formula: cm = in × 2.54
Reverse formula: in = cm × 0.393701
Worked example
1 in = 2.54 cm
- = 0.0254 m
- = 0.083333 ft
- = 0.027778 yd
Avoid these errors
Common mistakes
Match the dimension being compared
A diagonal screen measurement cannot be compared directly with a product width or height.
Useful for: Small imperial measurements converted to metric.
Common in to cm conversions
| inches | centimetres |
|---|---|
| 1 in | 2.54 cm |
| 2 in | 5.08 cm |
| 5 in | 12.7 cm |
| 10 in | 25.4 cm |
| 12 in | 30.48 cm |
| 24 in | 60.96 cm |
| 36 in | 91.44 cm |
| 72 in | 182.88 cm |
About the units
A inch is an imperial unit represented by in. A centimetre is a metric unit represented by cm. Calculations use the same authoritative registry as the full length converter, retaining full precision until display.
Sources and definitions
NIST — SI units and conversion guidance
Conversion constants come from the shared EzyCalculator unit registry. See how calculations are reviewed and tested.