Convert square centimetres to square inches
Enter a value in square centimetres (cm²) to get square inches (in²). One square centimetre is 0.155 square inches; one square inch is 6.4516 square centimetres.
How to use the Square centimetre to square inch
- Type the number of square centimetres.
- Click Convert.
- Read the result in square inches, plus the same value in every other area unit.
cm² to in² formula
square inches = square centimetres × 0.155. To go the other way, square centimetres = square inches × 6.4516 (see square inches to square centimetres).
Worked example
12 cm² × 0.155 = 1.86 in².
Square centimetres to square inches conversion table
| Square centimetres | Square inches |
|---|---|
| 0.1 cm² | 0.0155 in² |
| 0.5 cm² | 0.0775 in² |
| 1 cm² | 0.155 in² |
| 2 cm² | 0.310001 in² |
| 3 cm² | 0.465001 in² |
| 5 cm² | 0.775002 in² |
| 10 cm² | 1.55 in² |
| 20 cm² | 3.1 in² |
| 25 cm² | 3.875 in² |
| 50 cm² | 7.75 in² |
| 100 cm² | 15.5 in² |
| 250 cm² | 38.7501 in² |
| 500 cm² | 77.5002 in² |
| 1,000 cm² | 155.0003 in² |
About the square centimetre
Small surfaces; 1 cm² = 100 mm².
About the square inch
Exactly 6.4516 cm². Screens and small components in the USA.
Related conversions
Frequently asked questions
How many square inches in a square centimetre?
0.155 square inches.
How many square centimetres in a square inch?
6.4516 square centimetres.
Is the factor exact?
The factor 0.155 is derived from the units' exact definitions; only the display is rounded.
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Last updated 2026-09-23.