What kind of multiplier does One for All have?

Not good at strength calcs, curious as to how much of a multiplier OFA is...?

Nobody knows and they'd be lying if they said they did. There's not enough info to know how OFA scales with each user, we just know that it does.

The only clue is that it's not a simple stack(addition). Eight or so people, even well trained with Charles Atlas physical aptitude, can't stockpile enough power for All Might's level of feats, especially his implied prime feats. So there is a multiplier or logarithmic increment per generation, I would think. It might not be large hell it might even be a fraction, but if it compounds like I suspect it would be such that Toshinori and Midoriya are faaaar stronger than AFO's brother because of the compounding stockpiles between them while adjacent holders don't have that much of gap between them although the recipient will always become stronger than the one they received the torch from.