Square Centimeters to Square Inches
A square centimeter measures a 1 cm by 1 cm square, commonly used for the surface area of small objects and paper crafts. A square inch measures a 1 inch by 1 inch square, used for screen area and small parts in the US. 1 cm² equals ≈0.155 in², 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
in² = cm² × ≈0.155
cm² = in² × 6.4516
Worked example: 5 cm² × ≈0.155 = ≈0.775002 in².
Conversion table
| Square Centimeter (cm²) | Square Inch (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 | ≈3.10001 in² |
| 25 cm² | ≈3.87501 in² |
| 50 cm² | ≈7.75002 in² |
| 100 cm² | ≈15.5 in² |
| 250 cm² | ≈38.7501 in² |
| 500 cm² | ≈77.5002 in² |
| 1,000 cm² | ≈155 in² |
Frequently asked
- How many Square Inches in a square centimeter?
- 1 cm² equals ≈0.155 in².
- How do I convert Square Centimeters to Square Inches?
- Multiply the value in cm² by ≈0.155 to get in². The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Square Centimeter and Square Inch 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.