Inches to Cm Converter
Convert inches to centimetres (and back) instantly. Enter a value, pick a direction, and see the result update live. 1 inch = 2.54 cm.
How the conversion works
The inch is defined as exactly 2.54 centimetres under the international yard and pound agreement of 1959, so this conversion is exact — there is no rounding in the factor itself.
Inches to cm conversion chart
Common inch sizes converted to centimetres — covering everyday measurements, body/clothing sizes, and popular TV & monitor diagonals. TV and monitor sizes refer to the screen's diagonal.
| Inches | Centimetres | Common use |
|---|---|---|
| 1 inch | 2.54 cm | Single inch |
| 2 inches | 5.08 cm | Small measurement |
| 3 inches | 7.62 cm | Phone screen edge |
| 4 inches | 10.16 cm | Small photo print |
| 5 inches | 12.70 cm | Small phone screen |
| 6 inches | 15.24 cm | Large phone screen |
| 10 inches | 25.40 cm | Small tablet |
| 12 inches | 30.48 cm | 1 foot |
| 18 inches | 45.72 cm | Cushion / monitor |
| 24 inches | 60.96 cm | Monitor / 2 feet |
| 36 inches | 91.44 cm | Waist size / 3 feet |
| 40 inches | 101.60 cm | 40" TV diagonal |
| 42 inches | 106.68 cm | 42" TV diagonal |
| 48 inches | 121.92 cm | 48" TV / 4 feet |
| 55 inches | 139.70 cm | 55" TV diagonal |
| 65 inches | 165.10 cm | 65" TV diagonal |
Frequently asked questions
How many cm are in an inch?
There are exactly 2.54 centimetres in one inch. This is a fixed, internationally agreed definition, so 1 inch = 2.54 cm with no rounding. To convert any number of inches to centimetres, multiply by 2.54.
What is a 40 inch TV in cm?
A 40 inch TV has a diagonal of 40 × 2.54 = 101.6 cm. Remember that TV sizes describe the diagonal of the screen, not the width — the actual width of a 40" 16:9 TV is roughly 88.6 cm and the height about 49.8 cm.
How do I convert cm back to inches?
Divide the number of centimetres by 2.54. For example, 100 cm ÷ 2.54 = 39.37 inches. Switch the direction toggle above to do this automatically.
What is 5 feet in cm?
5 feet equals 60 inches, and 60 × 2.54 = 152.4 cm. To convert any height in feet and inches, first turn it into total inches (feet × 12 + inches) and then multiply by 2.54.
Is the inch to cm conversion exact?
Yes. Since 1959 the inch has been defined as exactly 2.54 cm, so the conversion factor is exact. Any small differences you see are only from rounding the final displayed result.