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.
While many of Thor's powers come from his hammer Mjolnir, he is no slouch without it. Mjolnir give him the Godblast and flight, and that's pretty much it. The lightning and strength, that's all him.
Tanks a 9-million year old bomb built by an extinct civilization that dwarfs a solar-system sized ship:
Defeats Worthy Loki (2:22 - 2:26):
Also in the video:
defeats Apocalypse Jr., Absorbing Man, Cyclops, Havok, Deadpool, bests Angela in combat, defeats Destroyer Thor, nearly kills Beta Ray Bill, slaughters trolls, breaks through the Collector's strongest chains, defeats Proxima Midnight, defeats Hela, Proxima Midnight, and Black Swan in one punch, defeats the Collector, cleaves into the Destroyer armor's shoulder, hurts Mangog, cuts off Mangog's tail, matches the Mother Storm and helps overwhelm the Phoenix, defeats Hercules, defeats Hydra, singlehandedly ends the battle of metahumans, knocks away multiple Beyonders, etc.
Clearly solar system to multi-galactic level. Proves Thor is not useless without his hammer.
Super Saiyan Goku would be overwhelmed.