Length and Area
cm²tomm²
Convert square centimetres (cm²) to square millimetres (mm²).
Factor1 cm² = 100 mm²
Converter
cm²
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mm²
Rendered to 6 significant figures.
Formula
Formula
mm² = cm² × 100
Multiply any value in square centimetres by 100 to obtain the value in square millimetres.
Worked example
Convert 1 cm² to mm².
- 01Start with 1 cm².
- 02Multiply by the conversion factor: 1 × 100 = 100 mm².
Result1 cm² = 100 mm²
Conversion table
| cm² | mm² |
|---|---|
| 1 | 100 |
| 2 | 200 |
| 5 | 500 |
| 10 | 1000 |
| 20 | 2000 |
| 50 | 5000 |
| 100 | 10000 |
| 200 | 20000 |
| 500 | 50000 |
| 1000 | 1.0000e+5 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from cm² to mm²?
1 cm² equals 100 mm². To convert, multiply the value in square centimetres by 100.
How do I convert 1 cm² to mm²?
1 cm² = 100 mm². For any value, multiply by 100.
How do I convert mm² back to cm²?
Divide by the same factor — or equivalently, multiply by 0.01. So 1 mm² = 0.01 cm².
When would I need to convert square centimetre to square millimetre?
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).