Convert square inches to square centimetres
Enter a value in square inches (in²) to get square centimetres (cm²). One square inch is 6.4516 square centimetres; one square centimetre is 0.155 square inches.
How to use the Square inch to square centimetre
- Type the number of square inches.
- Click Convert.
- Read the result in square centimetres, plus the same value in every other area unit.
in² to cm² formula
square centimetres = square inches × 6.4516. To go the other way, square inches = square centimetres × 0.155 (see square centimetres to square inches).
Worked example
12 in² × 6.4516 = 77.4192 cm².
Square inches to square centimetres conversion table
| Square inches | Square centimetres |
|---|---|
| 0.1 in² | 0.64516 cm² |
| 0.5 in² | 3.2258 cm² |
| 1 in² | 6.4516 cm² |
| 2 in² | 12.9032 cm² |
| 3 in² | 19.3548 cm² |
| 5 in² | 32.258 cm² |
| 10 in² | 64.516 cm² |
| 20 in² | 129.032 cm² |
| 25 in² | 161.29 cm² |
| 50 in² | 322.58 cm² |
| 100 in² | 645.16 cm² |
| 250 in² | 1,612.9 cm² |
| 500 in² | 3,225.8 cm² |
| 1,000 in² | 6,451.6 cm² |
About the square inch
Exactly 6.4516 cm². Screens and small components in the USA.
About the square centimetre
Small surfaces; 1 cm² = 100 mm².
Related conversions
Frequently asked questions
How many square centimetres in a square inch?
6.4516 square centimetres.
How many square inches in a square centimetre?
0.155 square inches.
Is the factor exact?
The factor 6.4516 is derived from the units' exact definitions; only the display is rounded.
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Last updated 2026-09-23.