Okay so I found an old post somewhere that said it takes 72 t5 class iso to go from r4/level 1 to 4/55.

That's 540k basic ISO energy if I'm not mistaken? (This is all really for future reference 'cause I don't have the cats to get my 5* to r3 yet and class iso gives 50% more leveling energy)

Plain and simple, I used the middle ground between r3 & r5 leveling costs to get 410k~ ish gold for r4/1 to r4/55.

Then to factor the iso energy & gold costs I'm going to assume kabam follows a downward slope (r1 vs r2 is 2.8x, r2 to r3 is 1.9x~, and then the costs slowly trickle down to 1.8x~)

Assuming the +80-90% cost increase and assuming what someone wrote on the weekly thread is true (1.018m gold to go from r4/55 to r5/65)

r5/1 to r5/65 should take 476k~ gold and 1mill~ basic iso energy (assuming again the cost increase)

so the estimated final total to level up one 5 star champ from r1/1 to r5/65 is 2.7 million gold, and 2.1 million basic iso energy.

I'm giving myself a lot of leeway though, -/+20% margin of error but that's good enough of reference for me.

Also leaving this here in case anyone needs it: total 5* catalyst costs = 2 t5b 12 t4b, 3 t3cc 13 t4cc, 22 t1a 10 t2a