So we know that Great Ape is 10 times stronger than base form Saiyans, and that Super Saiyan is a 50 times multiplier of base power level, then SSJ 2 is 100 times multiplier (or 2 times stronger than SSJ), and that SSJ 3 is 400 times stronger than base (or 8 times SSJ). But what about the rest? I will try to suggest a logical growth in power:
Base = x.
SSJ - 50x
SSJ Grade 2 - 60x
SSJ Grade 3 - 75x
SSJ Full Power - 80x
SSJ 2 - 100x
SSJ 3 - 400x
Here is where it gets divided into GT and Super, let's begin with GT since it's older:
Golden Great Ape - 500x (Ouzaru times 50)
SSJ 4 - 800x (SSJ 3 times two, to show why Goku was still using SSJ 3 at times)
Super (since Mystic and Ultra Instict are not Saiyan-only transformations I'll avoid listing them):
Super Saiyan God - 600x (to make the tiers logically stronger than the Buu Saga and not over the head)
Saiyan beyond God -300x (half the power of SSG, to make it clear why the SSG transformation is still used/depicted in both Anime and Manga. SBG was used against Frieza in Resurrection 'F' and against the likes of Hit and Copy-Vegeta, so basically A LOT STRONGER than the simple ki base form which was used against Cabba which would still be in the Buu Saga realms of power)
Super Saiyan Blue - 3000x (5 times stronger than SSG, if it was 50 times larger then the whole thing would be f*cked up; Perfect ki control allows it to be lowered into fractions so small he can sparr-test with Krillin without killing him)
Super Saiyan Rose - " (only keeps getting stronger due to zenkais)
Super Saiyan Rage - 1500x (mid way to SSB)
Super Saiyan Berserk - 350x (as they were amazed of Goku's power up in SSJ 3, it should be less than that)
Super Saiyan 2 (Kale version) - 380x (still wishing to become SSJ 3 for some reason... So as listed above.)
Super Saiyan Blue Shinka - 5000x (to make SSB looks like only 2/3 of the way)
Powerlevels are bullshit and the attempt to calculate them when they started failing as soon as Saiyan Saga, and for Super transformations when the very power scaling we were depending on got thrown out of the window is doomed to fail. Characters will be exactly as strong as they need to be and that's it. Some points, however :
- SSJ4 is definitely more than 2x SSJ3. Goku went from being barely in the same league as 1st form B. Vegeta to beating 3rd form B. Vegeta easily and being able to catch up to his Oozaru/Golden Oozaru state.
- SSG is also definitely way more than 1.5 x SSJ3, and is almost certainly stronger than SSJ4.
- Manga confirms SSG when self-ascended is at most 10 weaker than SSB. So SSB=5xSSG is not out of the question when you consider that.