Hi everyone

Recently, I have been playing some plo husngs to practice playing against short stacks. A very common spot heads-up is that button limps/raises and bb pots so that there is a SPR of ~0,75-2. Most of the time bb will make a pot sized cbet on the flop and the button is forced to fold a lot. bb obviously has an advantage in spots like this because of fold equity. However, I'm not sure how big this advantage is and how much more bb should be 3-betting in order to get a low SPR. Can anyone point me to how I can calculate bb's edge in these spots for different stack sizes?