Length and Area
mm²tom²
Convert square millimetres (mm²) to square metres (m²).
Factor1 mm² = 1e-6 m²
Converter
mm²
Accepts numbers or expressions, e.g. 150 + 14.7
Result
m²
Rendered to 6 significant figures.
Formula
Formula
m² = mm² × 1e-6
Multiply any value in square millimetres by 1e-6 to obtain the value in square metres.
Worked example
Convert 1.00000e+6 mm² to m².
- 01Start with 1.00000e+6 mm².
- 02Multiply by the conversion factor: 1.00000e+6 × 1e-6 = 1 m².
Result1.00000e+6 mm² = 1 m²
Conversion table
| mm² | m² |
|---|---|
| 1 | 1e-6 |
| 2 | 2e-6 |
| 5 | 5e-6 |
| 10 | 1e-5 |
| 20 | 2e-5 |
| 50 | 5e-5 |
| 100 | 1e-4 |
| 200 | 0.0002 |
| 500 | 0.0005 |
| 1000 | 0.001 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from mm² to m²?
1 mm² equals 1e-6 m². To convert, multiply the value in square millimetres by 1e-6.
How do I convert 1 mm² to m²?
1 mm² = 1e-6 m². For any value, multiply by 1e-6.
How do I convert m² back to mm²?
Divide by the same factor — or equivalently, multiply by 1000000. So 1 m² = 1.00000e+6 mm².
When would I need to convert square millimetre to square metre?
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).