Convert square inches to square centimeters
1 in² = 6.4516 cm² — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
6.4516cm²
As a fraction: 16129/2500
1 in² = 6.4516 cm²
How to convert square inches to square centimeters
Multiply the number of square inches by 6.4516 to get square centimeters.
The exact factor is 6.4516 — as a fraction, 16129/2500.
Square inch to Square centimeter conversion table
| Square inches (in²) | Square centimeters (cm²) |
|---|---|
| 1 in² | 6.4516 |
| 2 in² | 12.9032 |
| 3 in² | 19.3548 |
| 5 in² | 32.258 |
| 10 in² | 64.516 |
| 20 in² | 129.032 |
| 25 in² | 161.29 |
| 50 in² | 322.58 |
| 100 in² | 645.16 |
| 250 in² | 1612.9 |
| 500 in² | 3225.8 |
| 1000 in² | 6451.6 |
Square centimeter to Square inch conversion table
| Square centimeters (cm²) | Square inches (in²) |
|---|---|
| 1 cm² | 0.155 000 31 |
| 2 cm² | 0.310 000 62 |
| 3 cm² | 0.465 000 93 |
| 5 cm² | 0.775 001 55 |
| 10 cm² | 1.550 003 1 |
| 20 cm² | 3.100 006 2 |
| 25 cm² | 3.875 007 8 |
| 50 cm² | 7.750 015 5 |
| 100 cm² | 15.500 031 |
| 250 cm² | 38.750 078 |
| 500 cm² | 77.500 155 |
| 1000 cm² | 155.000 31 |
Frequently asked
How many square centimeters are in a square inch?
One square inch equals 6.4516 square centimeters (in² → cm²). That figure is exact, not rounded.
How do you convert square inches to square centimeters?
Multiply the number of square inches by 6.4516 to get square centimeters.
What is 1 cm² in square inches?
One square centimeter is 0.15500031 square inches.
What is 10 in² in cm²?
10 in² = 64.516 cm².