I haven't made a GT power level list in a long time, but I'll use figures from my last one in 2016:
SS3 Gotenks: 6,000
Ultimate Gohan: 9,000
Gohan-Boo: 15,000
SS Vegetto: 180,000 (bumped to fit GT scaling)
BOGT Goku: 300
SS: 750
SS2: 937.5 - 1,125
SS3: 1,875 - 3,375
SS2 multiplier varying from 1.25x to 1.5x and SS3 multiplier varying from 2x to 3x.
EDIT: Additional figures for comparison:
EOZ Goku: 1.5
SS: 75
SS2: 300
SS3: 1,500
BOGT Gohan: 9,600
SS: 24,000
Goku's base got 200x stronger but his Super Saiyan 3 only got 1.25x stronger. :elmo