AKA Playback %

      Your Bankroll might last an average of:

      but, 1 out of 4 sessions your bankroll might last  or less

      and, 1 out of 4 sessions your bankroll might last or longer

of Spins
During Visit

        Time on



 Half the Time

You'll be Within

This Range

Chance of
a Winning











Slot Machine Calculator


Estimates how much you might win or lose based on your slot machine and playing style.  First, specify Bet Per Spin, your Play Pace, Return to Player (RTP) %, and Volatility level.  Then click the Calculate button and see results in the table.  If you later change one or more of these parameters, click the Calculate button again.


The table shows you about how long it takes to spin each number of spins, how much you might lose on average, what you might lose on a terrible day or session, and what you might win or lose if almost everything went your way - 95% percent of the time.  Your actualy experience will most likely be between Terrible and Great.  And, unless you've won an average number of big wins, you are probably going to be losing more than the "Average Loss".

(You may need to scroll down to see entire table)

The following table shows you what might happen about 19 out of 20 sessions at your casino.  The rare 1 out of 20th session might result in a bigger loss than the "Terrible Visit" number, or a bigger win than the "Great Visit" number.  Notice that the longer you play, the more your outcome converges on the "Average Loss" number.  The "Chance of a Winning Visit" indicates how often you might leave the casino ahead.  "nil" means less than 1 chance in a million. Take a look at the percentage for your average visit length and see if it matches your experiences; but, remember your behavior when you are ahead or behind, and when you leave the casino makes a difference.  "Delta %" is the difference between your potential experience from the "theoretical RTP" of the machine.  Note: numbers are rounded.

Rev 2.1.6

Specify your style of play and
game type, then click Calculate.
See results in table below.

Click each time you

change any of the parameters