User blog:DonkeyKongApe/The Dragon Ball Multipliers Project

Summary
I'm going to try and list all of the multipliers I can get for forms and power boosting techniques in Dragon Ball. Most of this isn't 100% word of god, and what isn't word of god is just me trying to get the best answer I can out of official information.

Kaio-ken
Just using regular Kaio-ken seems to have a multiplier effect somewhere between 1 and 2 times as it has to be some kind of a boost and Kaio-ken times 2 is stated to be a 2 times multiplier. The other multipliers are given to us (eg. Kaio-ken times 3 is 3x)

Kaio-ken: Somewhere between 1x and 2x (Somewhere between 0% increase and 100% increase)

Kaio-ken 2-20: 2-20x (100% increase-1900% increase)

Power Up
That's when they do this. It's described as gathering ki to power one's self up. I suppose it really just depends on how much ki you gather up.

Power Up: >1x, how much it increases depends on how much ki you gather (>0% increase, how much it increases depends on how much ki you gather)

Great Ape
According to basically everyone you meet and the Dragon Ball Wiki, Great Ape has a 10x multiplier. I'm not sure where this originates from exactly but it seems legit and if someone could link it in the comments that would be great.

Great Ape: 10x (900% increase)

Potara Fusion
The SEG states that Potara Fusion is A's power times B's power which makes sense to me. I guess the way to do it is like this: If A is baseline Wall level and B is baseline Street level, and A is the 100% in this situation, then B is 2% here so it's 100 x 2 which will get you up to 200% or in this case twice as powerful as A's base form.

Potara Fusion: A's power x B's power (A% x B%)