Length and Area
in²tocm²
Convert square inches (in²) to square centimetres (cm²).
Factor1 in² = 6.4516 cm²
Converter
in²
Accepts numbers or expressions, e.g. 150 + 14.7
Result
cm²
Rendered to 6 significant figures.
Formula
Formula
cm² = in² × 6.4516
Multiply any value in square inches by 6.4516 to obtain the value in square centimetres.
Worked example
Convert 1 in² to cm².
- 01Start with 1 in².
- 02Multiply by the conversion factor: 1 × 6.4516 = 6.4516 cm².
Result1 in² = 6.4516 cm²
Conversion table
| in² | cm² |
|---|---|
| 1 | 6.4516 |
| 2 | 12.903 |
| 5 | 32.258 |
| 10 | 64.516 |
| 20 | 129.03 |
| 50 | 322.58 |
| 100 | 645.16 |
| 200 | 1290.3 |
| 500 | 3225.8 |
| 1000 | 6451.6 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from in² to cm²?
1 in² equals 6.4516 cm². To convert, multiply the value in square inches by 6.4516.
How do I convert 1 in² to cm²?
1 in² = 6.4516 cm². For any value, multiply by 6.4516.
How do I convert cm² back to in²?
Divide by the same factor — or equivalently, multiply by 0.1550003. So 1 cm² = 0.155 in².
When would I need to convert square inch to square centimetre?
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).