Slot Bankroll Calculator
See how long your money should last. Enter your bankroll, your bet per spin and the slot's RTP, and get the average number of spins, the cost per hour, and the total you'd wager along the way.
Check any slot's real RTP on its page.
⚠️ This is the mathematical average (expected value). Real slot sessions swing hard around it because of volatility, so you could bust much sooner or run far longer. It is not a prediction of any single session, and it assumes no bonuses or rakeback.
How is the bankroll calculation worked out?
It uses the game's house edge, which is 100% minus the RTP. Your average loss per spin is your bet times the house edge. Divide your bankroll by that and you get the average number of spins before your money runs out. Everything is expected value, so it's the long-run average rather than a promise for one session.
Can it tell me my chance of going bust?
No, and be wary of any tool that claims to. A true bust probability needs each slot's exact volatility model, which casinos don't publish. We stick to the honest average and flag clearly that real sessions swing a lot around it.
What RTP should I use?
Use the real RTP of the slot you plan to play. Most online slots sit between 94% and 97%. Every slot page on RTPspy shows its published RTP, and you can compare it to the win data we actually track.
Does the total wagered figure matter?
Yes. Casinos base VIP levels and rakeback on how much you wager in total, not how much you lose. The calculator shows the total you'd wager reaching the end of your bankroll, and links to our VIP calculators so you can see what tier that reaches.
18+. For information only. Gambling outcomes are random; this tool shows long-run averages, not a prediction of any session. Please gamble responsibly.