Goku’s power level is absolutely astronomical. In the last episode of Dragon Ball Z, he fights Frieza and Krillin says “He’s already passed our limits!” SAGA or a sagyan… Goku has never gone past the point of Super Saiyan 3. Vegeta tells him that they can go to Super Saiyan 4 but it will destry earth if they ever do (when their power surpasses 100x). When Goku fought against Pikkon in the tournament for senzu beans, it was said that this very technique would destroy the universe if done with too much force. It takes less than a second for Goku to shoot his Kamehameha Wave at Old Kai and blast him out of existence.