Unit Converter › Guides › Inches to Centimeters (in to cm)
Convert inches to centimeters with the exact factor defined by NIST (2.54), a ready table and worked examples.
Since the 1959 international yard and pound agreement, one inch is defined as exactly 2.54 centimeters. NIST lists this factor as exact.
Centimeters = Inches × 2.54. To convert inches to centimeters, multiply by 2.54.
| Inches | Centimeters |
|---|---|
| 1 | 2.54 |
| 2 | 5.08 |
| 3 | 7.62 |
| 4 | 10.16 |
| 5 | 12.7 |
| 6 | 15.24 |
| 8 | 20.32 |
| 10 | 25.4 |
| 12 | 30.48 |
| 15 | 38.1 |
| 18 | 45.72 |
| 20 | 50.8 |
| 24 | 60.96 |
| 27 | 68.58 |
| 32 | 81.28 |
| 36 | 91.44 |
| 48 | 121.92 |
| 55 | 139.7 |
| 65 | 165.1 |
| 75 | 190.5 |
Values are rounded to 2 decimal places for display. The factor itself is exact, so any rounding comes only from the last digit shown.
A 27-inch monitor diagonal: 27 × 2.54 = 68.58 cm. A 32-inch waist: 32 × 2.54 = 81.28 cm.
Yes. The inch has been defined as exactly 2.54 cm since 1959, so the factor needs no rounding.
12 inches, which makes 1 foot exactly 30.48 cm.
Last checked: 29 October 2026.