Casino
Slot Machine Odds Calculator
Calculate slot jackpot probability, expected return and RTP from supplied outcome probabilities and gross multipliers. No game odds are inferred from denomination.
Your result
90.00%
RTP from the supplied outcome table
- Jackpot per spin
- 1.00%
- At least one jackpot in entered spins
- 63.39676587%
- Expected net per spin
- −$0.10
- Expected net over entered spins
- −$10.00
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User-supplied exhaustive outcomes; does not infer proprietary reel weights or progressive triggers.
Jackpot odds need the game’s outcome weights
Enter an exhaustive list of mutually exclusive outcomes and their probabilities. Probabilities must sum to 100%. The selected jackpot row has chance p per spin; at least one jackpot in n independent spins has probability 1−(1−p)ⁿ.
The illustrative 90%, 9%, 1% distribution with multipliers 0, 5 and 45 has 90% RTP: 0.9 × 0 + 0.09 × 5 + 0.01 × 45 = 0.9. Its jackpot chance is 1%, and at least one in 100 spins is about 63.40%. These are demonstration inputs, not typical slot odds.
RTP, denomination and unknown jackpot odds
A slot’s visible reel symbols, credit denomination and last results alone do not disclose its internal weighted outcome distribution. If probabilities or the paytable are unavailable, this tool cannot calculate that game’s jackpot chance.
Multipliers are gross returns including any returned stake. Use the slot denomination calculator to turn paid credits into currency. A must-hit-by progressive needs its actual threshold distribution and reset rules; a credit balance is insufficient.