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.
"Thor #600": In this comic, Rune King Thor defeats Galactus, the devourer of worlds, without much effort.
"Journey into Mystery #622-624": In this arc, Rune King Thor faces and defeats the goddess of chaos and destruction, Amatsu-Mikaboshi.
"New Avengers Annual #1": In this comic, Rune King Thor faces and defeats Thanos with the Infinity Stone.
In addition to these feats, Rune King Thor is also shown as a character capable of manipulating reality, traveling through time and space, and having control over all forms of energy. This makes him a fearsome opponent for any other character, including Darkseid.