How to convert square inches to square centimeters
- Take the value in square inches.
- Use the formula square centimeters = square inches × 6.4516.
- For example, 1 in² is 6.45 cm².
About square inches and square centimeters
An inch is exactly 2.54 cm, so a square inch is 2.54 × 2.54 = 6.4516 cm². Multiply square inches by 6.4516 to get cm². The factor is exact, and 6.5 is close enough for a quick estimate (under 1% high).
Labels, stickers, patches, print sizes and contact areas on US specs are often given in square inches. Pressure in psi is force per square inch too, so this conversion turns up when working out the force on a piston or gasket in metric units.
Examples
- 1 in² (one square inch) is 6.45 cm²
- 7.16 in² (a credit card, 3.37 by 2.125 in) is 46.19 cm²
- 93.5 in² (a US Letter sheet, 8.5 by 11 in) is 603.22 cm²
- 144 in² (one square foot) is 929.03 cm²
Square inches to square centimeters chart
| Square inches (in²) | Square centimeters (cm²) |
|---|---|
| 0.25 | 1.61 |
| 0.5 | 3.23 |
| 1 | 6.45 |
| 2 | 12.9 |
| 3 | 19.35 |
| 4 | 25.81 |
| 5 | 32.26 |
| 6 | 38.71 |
| 8 | 51.61 |
| 10 | 64.52 |
| 12 | 77.42 |
| 15 | 96.77 |
| Square inches (in²) | Square centimeters (cm²) |
|---|---|
| 16 | 103.23 |
| 20 | 129.03 |
| 24 | 154.84 |
| 25 | 161.29 |
| 30 | 193.55 |
| 36 | 232.26 |
| 48 | 309.68 |
| 50 | 322.58 |
| 64 | 412.9 |
| 93.5 | 603.22 |
| 100 | 645.16 |
| 144 | 929.03 |