Let's say rake is 6%
How many chips would I need to make to break even?
How many chips per game = 1% ROI?
How many chips per game = 2% ROI?

Quickest way to figure out how much fee the site takes and multiply it by number of starting chips.

Example: Regular Spin with 7% rake: 500*0.07 = 35

This is not the most accurate because of the multipliers distribution but can give you an idea

Let's say rake is 7% of a 1€/$ game, so 0,07 $


Then i figure out the chip value of a x2,x3 and x5 multiplier

2€ prize = 2€ / 1500(number of chips in play) = 0,0013333
3€ prize = 3/1500 = 0,002
5€ prize = 5/1500 = 0,00333

Then to figure out the average chip value i muliply the chip value for the frequency of finding a certain multipier, i add the higher than 5 multiplier frequency to the 5 frequency to approximate, but you could add those in your calculations.

so

average chip value = 0,001333*0,5248 + 0,002 * 0,384 + 0,00333 * 0,0912 = 0,001772 € This is pokerstars frequency

Then divide rake by the average chip value

To breakeven = 0,07/0,001772 = 39,50 chips

At 6% rake 33,8 chips