interesting. I remember during freeza's battle on namek, he mentioned his power to be 500,000 on his base form. And 1 million after he transforms the 1st time. So probably his power grows twice each time he transforms, giving his final form at around 4 million. Goku's first SSJ1 should be around 5 million then. Teen gohan's SSJ2 form when he fights with cell should be around 20 - 40 million. Goku's first SSJ3 during Fat Majinboo fight scene should be at 100 million.