Square Inches to Square Centimeters
A square inch measures a 1 inch by 1 inch square, used for screen area and small parts in the US. A square centimeter measures a 1 cm by 1 cm square, commonly used for the surface area of small objects and paper crafts. 1 in² equals 6.4516 cm², so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to area, measured here against area's base unit (m²) — every other area unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
cm² = in² × 6.4516
in² = cm² × ≈0.155
Worked example: 5 in² × 6.4516 = 32.258 cm².
Conversion table
| Square Inch (in²) | Square Centimeter (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 |
Frequently asked
- How many Square Centimeters in a square inch?
- 1 in² equals 6.4516 cm².
- How do I convert Square Inches to Square Centimeters?
- Multiply the value in in² by 6.4516 to get cm². The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Square Inch and Square Centimeter are both defined by a fixed conversion factor to area's base unit (m²), so the result shown is exact to the precision displayed, not an approximation.