Length and Area
mm²tocm²
Convert square millimetres (mm²) to square centimetres (cm²).
Factor1 mm² = 0.01 cm²
Converter
mm²
Accepts numbers or expressions, e.g. 150 + 14.7
Result
cm²
Rendered to 6 significant figures.
Formula
Formula
cm² = mm² × 0.01
Multiply any value in square millimetres by 0.01 to obtain the value in square centimetres.
Worked example
Convert 100 mm² to cm².
- 01Start with 100 mm².
- 02Multiply by the conversion factor: 100 × 0.01 = 1 cm².
Result100 mm² = 1 cm²
Conversion table
| mm² | cm² |
|---|---|
| 1 | 0.01 |
| 2 | 0.02 |
| 5 | 0.05 |
| 10 | 0.1 |
| 20 | 0.2 |
| 50 | 0.5 |
| 100 | 1 |
| 200 | 2 |
| 500 | 5 |
| 1000 | 10 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from mm² to cm²?
1 mm² equals 0.01 cm². To convert, multiply the value in square millimetres by 0.01.
How do I convert 1 mm² to cm²?
1 mm² = 0.01 cm². For any value, multiply by 0.01.
How do I convert cm² back to mm²?
Divide by the same factor — or equivalently, multiply by 100. So 1 cm² = 100 mm².
When would I need to convert square millimetre 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).