Length and Area
cm²toin²
Convert square centimetres (cm²) to square inches (in²).
Factor1 cm² = 0.1550003 in²
Converter
cm²
Accepts numbers or expressions, e.g. 150 + 14.7
Result
in²
Rendered to 6 significant figures.
Formula
Formula
in² = cm² × 0.1550003
Multiply any value in square centimetres by 0.1550003 to obtain the value in square inches.
Worked example
Convert 100 cm² to in².
- 01Start with 100 cm².
- 02Multiply by the conversion factor: 100 × 0.1550003 = 15.5 in².
Result100 cm² = 15.5 in²
Conversion table
| cm² | in² |
|---|---|
| 1 | 0.155 |
| 2 | 0.31 |
| 5 | 0.775 |
| 10 | 1.55 |
| 20 | 3.1 |
| 50 | 7.75 |
| 100 | 15.5 |
| 200 | 31 |
| 500 | 77.5 |
| 1000 | 155 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from cm² to in²?
1 cm² equals 0.1550003 in². To convert, multiply the value in square centimetres by 0.1550003.
How do I convert 1 cm² to in²?
1 cm² = 0.155 in². For any value, multiply by 0.1550003.
How do I convert in² back to cm²?
Divide by the same factor — or equivalently, multiply by 6.4516. So 1 in² = 6.4516 cm².
When would I need to convert square centimetre to square inch?
Area conversions are common in heat-exchanger surface area, site layout, and land-use planning where imperial and metric conventions mix.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).