30 cm³ = 0.00003m³
The conversion of cm to meters is 100:1.
But that's cubed, see.
So the ratio of cm³ to cubic meters is 100³:1, or 1,000,000:1
Take 30 cm³, divide it by the conversion factor for m³, and voila.
30cm³ /1,000,000 = 0.00003 m³
Agree with LambLamb if you are trying to convert 30 CUBIC CENTIMETERS
However , if you are trying to find the equivalent of a cube that is 30 x 30 x 30 cm ....some would say THIS is 30 cm cubed
then the cubic meter volume is 30 x 30 x 30/1,000,000
27,000/1,000,000 = 27/1000 = .027 cubic meter