Inches to CM Converter
Convert inches to centimetres exactly — handy for screens, waist sizes, paper and furniture.
Quick answer
1 inch = 2.54 cm exactly. Multiply inches by 2.54 — for example a 12-inch ruler is 30.48 cm. For the reverse, use cm to inches.
- Free
- No sign-up
- Units
- Updated October 2026
About the Inches to CM converter
Since 1959 the inch has been defined as exactly 2.54 cm, so multiplying by 2.54 gives an exact answer, not an approximation.
Screen sizes are measured diagonally: a 55-inch TV is 139.7 cm corner to corner, not wide.
How to use it
- Enter inches.
- Read the centimetre value.
- Swap to convert back.
Inches to centimetres table
| Inches (in) | Centimetres (cm) |
|---|---|
| 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 |
| 8 in | 20.32 cm |
| 10 in | 25.4 cm |
| 12 in | 30.48 cm |
| 15 in | 38.1 cm |
| 18 in | 45.72 cm |
| 24 in | 60.96 cm |
| 27 in | 68.58 cm |
| 32 in | 81.28 cm |
| 36 in | 91.44 cm |
| 40 in | 101.6 cm |
| 50 in | 127 cm |
| 65 in | 165.1 cm |
The formula
cm = inches × 2.54
- Example: 12 in × 2.54 = 30.48 cm.
Frequently asked questions
How many cm is 1 inch?
Exactly 2.54 cm.
How many cm is a foot?
12 inches × 2.54 = 30.48 cm.
Results are estimates for planning — check critical figures with a professional or the official source.
Popular tools
Image Converter
Convert any image to JPG, PNG or WebP, with quality and size controls.
Image
JPG to PNG Converter
Turn JPG files into PNG right in your browser — drag in one image or thirty.
Image
PNG to JPG Converter
Turn PNG files into JPG right in your browser — drag in one image or thirty.
Image
WebP to JPG Converter
Turn WebP files into JPG right in your browser — drag in one image or thirty.
Image