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.
If you disagree here's the reason:
Rimuru only destroyed 10k planets not universes
Black could match and beat ssjb goku which in base is stronger then ssjgod goku(battle of gods) which in bog(battle of gods) almost destroyed the dbz universe which has infinite highercys
Which makes goku outerversal
Also black use the damge and the pain as a resource of strange for example
In the dbs we said at the beginning that ssb goku I stronger than ssr black (super sayain rose 1) but in the middle of the fight black turned the table and become stronger than goku and vegeta tougher
He also has zamasu abiltys so he can heal him self in a short moment
Black is invincible wich mean that rimuru has no chance to defeat him