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.
Maul defeated Qui-Gon Jinn, a jedi Master.
Jedi Master is more powerful than a padawan, and guess, Padawans have good feats such as destroying a planet and create a star:
Qui-Gon is also way more powerful than Yarael Poof, who managed to contain the energy of the Infant of Shaa while mortally wounded.
Here is the evidences that this weapon can destroy a planet, in this case Coruscant, which is much larger than the earth.
"Split Coruscant in half"
"A weapon capable of destroying an entire planet"
"An entire planet being wiped out"
"It could destroy a planet"
"Destroy a planet and throw the Republic into chaos"
"Tear an entire planet apart"
They say that it will destroy Coruscant