The calculation needs the price of a paid spin, the number of spins and the RTP of the selected game setting. Keep every cash amount in one currency. Selecting a game inserts the percentage recorded in the catalogue; a version offered by a particular casino may use another setting.
The calculation assumes you complete the stated number of paid spins. If the balance runs out earlier, the total wagered changes. RTP alone does not provide a probability range for one session.
Same turnover at a different RTP
| RTP | Theoretical expected loss | Difference in loss |
|---|
Expected loss is a mathematical average for the stated turnover. It does not specify the chance of profit, the bonus frequency or the amount left in your account.
Which amount determines expected loss
Turnover is the sum of paid stakes. With a fixed spin price, it equals bet × number of spins. Theoretical return is turnover × RTP. Expected loss is the difference between turnover and that return, or turnover × (100% − RTP).
For example, 600 spins at €0.40 produce €240 of turnover. At 96% RTP, expected payouts are €230.40 and expected loss is €9.60. That €230.40 counts all payouts included in the game model. It is neither net profit nor a promised account balance.
A deposit measures something else. Money paid back by a game can fund another stake, so a €100 deposit can support turnover above €100. It can also run out before the planned spins are complete. The relevant amount is paid turnover, rather than the size of the first deposit.
Why an average cannot give a session range
Two games with the same RTP can distribute payouts differently. One may return small amounts more often; another may allocate a larger share of return to rare large rounds. Their average does not describe every payout or specify how many spins will return nothing.
A “high” volatility label does not supply an exact standard deviation either. It cannot supply the probability of profit or the bounds of a single session. A valid range needs the particular game’s payout distribution, the mode rules and a suitable statistical model.
A game described as less volatile can still depart substantially from its average over a short run. Persistent features, tumbles and bonus states also depend on the rules connecting stages. The number of animations is not necessarily the number of paid attempts. Identify which action charges a stake and which payouts belong to that round.
Compare RTP settings at the same turnover
A percentage difference needs the same calculation base. On €10,000 of turnover, 96% and 94% settings differ by €200 in expected loss. That does not promise a €200 gap between two actual sessions: the payouts in each session remain unknown.
Consider hypothetical settings of 96.5%, 95.5% and 94.5%. Neighbouring values differ by one percentage point. On €200 of turnover, that point equals €2 of expected loss. The two outer settings differ by two points, or €4. Smaller turnover reduces the difference in the same proportion.
Ordinary spins and feature purchases can use different return settings. The game name alone does not select the appropriate mode. The RTP version needs to match the configuration and stake rules to which the percentage belongs.
Account for feature prices and stake surcharges
Count the full entry charge. If the standard stake is €0.20 and a feature costs 100x, one purchase charges €20. Ten purchases create €200 of turnover, not €2. Applying the ordinary-spin percentage to those purchases is valid only when that percentage also covers the purchase mode.
Free spins included in a purchased round do not separately increase paid turnover. The round’s payouts belong to the one paid purchase. A stake surcharge also changes the amount charged: an extra €0.05 on a €0.20 standard stake makes the paid attempt cost €0.25.
A spin plan differs from a limited balance
The spin count specifies a calculation plan, not how long a deposit will last. If the balance falls below the required stake, the plan cannot continue without another deposit. If you stop early, the relevant count is the paid attempts actually completed. A large payout does not make the next outcome known.
Your spending budget sets a cash boundary; expected loss does not. An expected €9.60 loss does not mean that precisely €9.60 can fund 600 spins. Bonus-balance rules, payment fees and withdrawal restrictions can affect available money, but they are outside the game’s return formula.
Spending control depends on deposits, the remaining balance and payouts already received. A spending limit or break restricts the activity itself. Those controls operate separately from mathematical expectation, whether the session finishes above or below the average.