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.
Considering that already Chaos' first and weakest incarnation (called Queen Metalia), could easily do things like these, it should be obvious Chaos is incredibly powerful.
As a concept, Chaos is intangible, it's nigh-omnipresent in every space, every time, every dimension etc and it can in fact only be "defeated" (or at least weakened temporarily) with the highest cosmic tier of concept manipulation (which only Sailor Moon happens to have).