Mm² to dm² conversion factor and mm² to dm² conversion formula
The square millimeters to square decimeters (mm² to dm²) conversion factor is 0.0001
1 mm² = 0.0001 dm²
To convert X square millimeters to square decimeters you should use the following mm² to dm² conversion formula:
0.0001 × X square millimeters = Result in square decimeters