RTP Calculator
Calculate expected returns, losses and house edge based on RTP, bet size, volatility and number of spins.
Expected Results
Mathematical Average (at exactly 96% RTP)
Total Wagered
€1,000.00
Expected Return
€960.00
Expected Loss
€40.00
House Edge
4.00%
Probable Range (95% CI)
Low Estimate
€526.14
High Estimate
€1,393.86
Worst Case (95%)
-€473.86
Best Case (95%)
+€393.86
Profit Probability
Chance of Profit
42.8%
With fewer spins, variance can still work in your favor. Short sessions give you better odds of walking away in profit.
These calculations are based on mathematical expectation. The probable range shows where 95% of results fall, based on game volatility (UKGC methodology).
Know your odds before you spin
Project expected outcomes and check your real results against the math.
Expected return and loss
Project expected return, loss and house edge from RTP, bet size and spins.
Check your actual RTP
Enter what you wagered and won to compute the real RTP of your session.
Confidence intervals
See whether your result sits within the statistically expected range.
Ruin probability
Estimate the chance of busting your balance over a number of spins.
Profit probability
How likely you are to end a session in profit at a given RTP and volatility.
Volatility aware
Factor slot volatility into every projection for realistic ranges.
Frequently Asked Questions
RTP is the percentage of all wagered money that a slot returns to players over time. A slot with 96% RTP returns 96 for every 100 wagered on average, and the remaining 4% is the house edge.
Theoretical RTP is the mathematically defined long-term average set by the developer. Your actual RTP in a single session can differ significantly due to variance. Use the Actual RTP tab to measure your real session results against the theoretical value.
Ruin probability is the estimated chance of losing your entire starting balance before completing your planned number of spins. A small bankroll, high bet sizes or very high volatility all increase this risk.
Short sessions are dominated by variance, not the theoretical average. RTP converges to the expected value only over tens of thousands of spins. A big win or a losing streak in a short session can produce results far outside the expected range.
Volatility determines how much results swing around the average. High volatility means bigger wins and bigger losses, while low volatility means steadier outcomes. The calculator uses volatility to compute the confidence interval and ruin probability.
Profit probability is the estimated chance of ending your session ahead, meaning you win back more than you wagered. Because every slot has a house edge, this probability drops the longer you play.
Gross Gaming Yield is the amount the casino keeps from your play, calculated as total wagered minus total returned. In the Actual RTP tab it shows how much your session contributed to the casino over the period you tracked.