Simulate a slot session: why 96% RTP still ends most nights lower
Three hundred imaginary sessions show how wide results spread around an average that favours the casino.
This simulator plays 300 imaginary slot sessions in Canadian dollars using your bankroll, bet, RTP, spin count and volatility. It reports expected loss, the share of sessions that finish ahead, the share that go broke and the median balance. It is a simplified teaching model, not a game replica.
RTP describes millions of spins. You play a few hundred. In between sits variance, and that is what this tool lets you see. Compare the other picks on the casino sites in Canada.
Change one setting at a time and watch how the spread of outcomes moves.
Slot session simulator
What the model does
Every spin has a chance to return a multiple of the bet, scaled so that the average return matches the RTP you type. Low volatility makes small wins common. High volatility makes large wins rare. The tool replays your session 300 times and counts how each one ends.
Four lessons to try
- Raise the spins from 100 to 1,000. The share of sessions ahead drops.
- Move volatility from low to high. Broke sessions rise, and so do the rare large results.
- Cut RTP from 96 to 94. Expected loss per spin goes from 4 to 6 per cent of the bet, a 50 per cent increase.
- Double the bet. The bankroll lasts about half as long.
Background on these concepts sits in the slots explainer.
What is missing from the model
Real slots have bonus rounds, cascades and jackpots that this version ignores. Treat the numbers as illustrations of principle. Each click uses fresh random draws, so results change a little every time.
From simulation to a budget
When the output shows most sessions finishing lower than they began, believe it: that is the house edge. Then set a firm cap with the budget planner and review limits on the responsible gambling page.
Common questions
Is 97% a good figure?
It is better than 94 per cent, since the house edge falls from 6 to 3 per cent. Yet RTP is an average over a huge number of spins, so most real sessions still lose. Treat it as one input beside volatility and bet size, and read the exact figure in the game's own information screen.
Why did I end up ahead in the simulation?
Short sessions have plenty of variance, so a good share of players finish ahead even on a game with an edge. Add spins and the typical result slides toward the expected loss. Try 2,000 spins and you will see the winning share shrink noticeably.
Does volatility change the edge?
No. Two slots with the same RTP cost the same on average. Volatility alters the shape of results: many small wins versus few large ones. It decides how long a balance lasts and how rough the ride feels, but not the long-run expected cost.