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Casino Bankroll Calculator

How long will your money last? Enter your numbers: we calculate the average cost and run 2,000 simulated sessions in your browser to show what a typical session looks like.

Shown in the game's info or rules screen.
Average cost per hour
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Total bets your bankroll generates (typical session)
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Typical session length until broke
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Broke after 1 hour / 3 hours
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Sessions that ever doubled the bankroll
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Generic slot models, not a real game. Results vary run to run. Math, not a prediction.

How the calculator works

The average cost is simple: bet × spins per hour × house edge, where house edge = 100% − RTP. The simulation then plays 2,000 sessions with a generic slot whose payout table is scaled to your RTP. Volatility changes how the RTP is paid: frequent small wins (low), or rare big ones (high). See the full experiment in Slot Volatility: Low vs High and RTP Explained.

FAQ

How long will $100 last on a slot machine?

It depends on bet size, RTP and volatility. On average a $1 bet on a 96% RTP slot loses 4 cents per spin, but in our simulation the typical $100 lasted about 690 spins on a medium-volatility slot and only about 290 spins on a high-volatility one.

How do I calculate my expected loss per hour?

Multiply your bet size by spins per hour and by the house edge (100% minus RTP). Example: $1 × 600 spins × 4% = $24 per hour on average.

Does volatility change the expected loss?

No. Volatility changes how unevenly results are spread, not the average. High volatility makes most sessions end faster, while a few players win big.

18+ only. Set a money and a time limit before you play. Responsible gambling.