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RTP & House Edge Calculator: Expected Session Cost
Enter a published or assumed RTP, stake per round and total rounds to estimate long-run average session cost. Results do not predict your actual wins or losses.
How it works & examplesUnderstand the calculation
RTP, house edge and the expected cost of a session
Turnover is the sum of all stakes, including money reused after a payout. For 200 rounds at 0.50 units each, turnover is 100. At 97% RTP, expected gross return is 97 and expected mathematical loss is 3. The house edge is 3%, because it is the difference between 100% and the entered RTP.
RTP is a long-run average, not a forecast of the next spin; inspect concrete wheel outcome odds in Roulette Odds Calculator: European Payouts and Virtual Spins.
This does not mean a 100-unit deposit is required or that exactly 3 will be lost. The same balance may fund repeated rounds, while a limited balance may also run out before all planned rounds are played. This calculator holds stake, RTP and planned round count fixed; it does not model the distribution of session results or the chance of completing the session.
Maths & verification
Calculate house edge, total turnover, expected gross return and expected loss from a stated RTP, a stake per round and number of rounds.
Try the simulator below. Input values stay in your browser; no account or money is involved.
Model assumptions: No. Virtual games use declared teaching models. Verify any actual operator’s payout rules independently.
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How to use the tool
See how an assumed return-to-player percentage changes mathematical average loss across repeated casino wagers.
- Enter a published or assumed RTP between 0% and 100%.
- Choose a stake per round, the number of rounds and one consistent unit.
- Compare total wagered turnover, gross expected return and expected loss.
Understanding your result
At 97% RTP, 2 units per round over 500 rounds is 1,000 units wagered, with 970 units of expected gross return and 30 units of expected mathematical loss.
Scope and limitations
RTP does not describe short-session variance, bonus conditions, actual bankroll depletion, jackpot rules or casino fees. It never predicts a particular result.
Before you rely on the result
- How the calculation works
Formulas, assumptions, rounding and model limits are documented on the methodology page.
- Check the current inputs
Use the odds, RTP, fees, bonus terms or other values currently shown by the operator or market.
RTP and house edge: turn a percentage into expected session cost
RTP is a long-run return ratio, not a promise about one session. The useful calculation is to convert RTP into house edge, then apply that edge to total wagering turnover.
For stake s, round count n and RTP r written as a decimal: turnover = s × n, expected gross return = turnover × r, and expected loss = turnover × (1 − r). Rebet winnings count again when they become new stakes.
Same turnover, different RTP
A one-point RTP difference becomes meaningful over large turnover. On 1,000 units wagered, 99% RTP implies 10 units of expected loss; 94% RTP implies 60.
| RTP | House edge | Expected loss on 1,000 wagered |
|---|---|---|
| 99% | 1% | 10 |
| 97% | 3% | 30 |
| 96% | 4% | 40 |
| 94% | 6% | 60 |
| 90% | 10% | 100 |
Deposit size is not turnover
A 100-unit balance can generate far more than 100 units of turnover if returned winnings are wagered again. Ten 10-unit bets create 100 units of turnover even if the same balance funds several of them. Expected loss is tied to wagering volume, not the opening deposit by itself.
What RTP does not tell you
RTP does not describe volatility, the probability of busting before a planned number of rounds, jackpot contribution, bonus rules or the distribution of outcomes. Two games can have the same RTP and very different short-session risk.
Worked example
At 97% RTP and 1,000 wagered units, mathematical expected loss is 30 units.
Can the real session lose more?
Yes. Actual play can differ greatly from the long-run expectation, especially with high-volatility games.
Questions about this calculation
Will a 97% RTP return 97% of my stakes every session?
No. RTP is a long-run expected average, not a guarantee of a specific session result.
How can wagered turnover exceed my initial deposit?
When you rebet returned winnings, the new bets also count toward total wagering turnover.
When is RTP & House Edge Calculator: Expected Session Cost the right tool?
See how an assumed return-to-player percentage changes mathematical average loss across repeated casino wagers.
How should I read the result from RTP & House Edge Calculator: Expected Session Cost?
At 97% RTP, 2 units per round over 500 rounds is 1,000 units wagered, with 970 units of expected gross return and 30 units of expected mathematical loss.
What can RTP & House Edge Calculator: Expected Session Cost not tell me?
RTP does not describe short-session variance, bonus conditions, actual bankroll depletion, jackpot rules or casino fees. It never predicts a particular result.