Centimetres to Inches Conversion
One centimetre equals exactly 0.393701 inches; equivalently, 1 inch equals exactly 2.54 centimetres. To convert cm to inches, multiply by 0.393701 (or divide by 2.54). To convert inches to cm, multiply by 2.54. The 2.54 definition is exact by international agreement since 1959, making all metric-to-imperial length conversions precise and reversible with no rounding error.
Screen sizes are measured diagonally in inches (a 15.6-inch laptop screen), while European component dimensions are in centimetres. Clothing and shoe sizing uses different units in different markets: a 34-cm waist measurement vs a 13.4-inch one. Photography and printing specify paper in both cm and inches (A4 = 21 × 29.7 cm = 8.27 × 11.69 in). Medical measurements — wound size, tumour dimensions — typically use centimetres in clinical settings but may be reported in inches to patients.
Centimetres to Inches Table
| cm | Inches | cm | Inches |
|---|---|---|---|
| 1 | 0.394 | 15 | 5.906 |
| 2.54 | 1.000 | 25 | 9.843 |
| 5 | 1.969 | 30 | 11.811 |
| 10 | 3.937 | 50 | 19.685 |
| 12 | 4.724 | 100 | 39.370 |
