RTP 99% · THEORETICAL MODEL
Expected return calculator
See how a 1% mathematical house edge affects turnover over many rounds. This is an expectation, not a prediction of your session.
RTP99.00%fixed in this model
turnover×1%= expected loss
Important: variance can produce a much larger win or loss in any real session, and the bankroll may be exhausted before all rounds are played. RTP never guarantees profit.
Formula
How the estimate is calculated
| Output | Calculation in this model |
|---|---|
| Total wagered | Bet per round × number of rounds |
| Theoretical return | Total wagered × 99% |
| Expected loss | Total wagered × 1% |
| Expected final bankroll | Starting bankroll − expected loss |
The expected final bankroll is a mathematical simplification. It assumes the planned turnover can be completed; in reality, the bankroll may be exhausted first.
Expectation versus session
RTP does not describe the path
Two games can share a 99% RTP and still produce very different short-term experiences because volatility, paytable shape, maximum win and feature frequency differ. RTP says nothing about when returns occur.
Review the slot checklist or the Originals guide before applying a percentage to a specific title.
No result prediction.
The output is not a forecast, a strategy, a promise of loss limits or evidence that continued play will converge during a user's lifetime.
Comparing 99% RTP and Zero Edge
A 99% RTP corresponds to a 1% theoretical house edge in this simplified model. Duel's published Zero Edge explanation describes a different mechanism for eligible play within an allowance. Do not apply that allowance to every game or use this calculator as proof of current Duel terms.
99% RTP model
Expected loss equals 1% of turnover, before other conditions.
100% theoretical RTP
Zero expected house edge does not remove variance.
Real session
The outcome can diverge sharply from either expectation.
Use the result responsibly
If the expected turnover cost is uncomfortable, the appropriate response is to reduce or avoid the activity—not to search for a stake pattern that claims to beat randomness. Visit the responsible gambling resources for limit and exclusion options.
Key points
Frequently asked questions
What does 99% RTP mean?
In the long-run model, 99 units are theoretically returned for every 100 units wagered across a very large sample, leaving a 1% house edge.
Does 99% RTP mean I will lose exactly 1%?
No. The 1% figure is an expectation over turnover. A real session can finish with a much larger loss or a gain.
Why can total wagered exceed the bankroll?
The same funds can be recycled through repeated rounds. Turnover counts every stake, not only the initial deposit.
Is this calculator specific to every Duel game?
No. It is an educational fixed 99% model. Use the exact RTP and rules published for the game you are assessing.
18+
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Gambling is not a way to earn money
Play only where it is legal, set a hard limit in advance and never chase losses.