The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
you know how ridiculous dragon ball characters are in feats, naruto characters are complete mockery next to DBZ verse.
In addition, Cell's statement is true, since in the manga with the Japanese translation it does say that it can destroy the solar system.
also Naruto's Ha'xs and techniques are clearly super useless with someone so abysmal in feats, Naruto is not even a small planetary level, any of the majority of dragon ball characters solo the entire Narutoverse