Square To Circle cylinder

I am trying to design a fan shroud for a rad. The rad is square in shape and the fan is round so I am trying to make a shape that is a square on one end and a circle on the other. A cylinder with a square end I guess is the best way to describe it.

I can't seem to figure out how to change the shape of one end of a box to be circular or one end of a cylinder to be square. Does anyone know if this is possible in tinkercad? Or do I need to use a more involved software to create this shape?


Thanks in advance for your help.

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