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.
Injustice Superman scales above Injustice Wonder Woman who can break Superboy with his blue power's jaw, and the same Superboy who weakened Ultraman. So Injustice Superman shouldn't be too far off from AP to contend with Ultraman. Plus Injustice Superman is much smarter and more skilled compared to Ultraman who has none of those traits, he's just bloodlusted and doesn't hold back when he fights.