The house publishes the odds it wants you to see. So does the market. These tools price what's left out.
Expected Value
The universal one. Any bet, trade, or decision with a known win rate and payoffs, priced per trial and over a run.
Compound Growth
What a small edge turns into when you let it ride. Periods can be trades, sessions, months, or years.
Must-Hit-By Progressive
Estimates the EV of playing a capped progressive to the top, and the meter level where it turns positive.
Kelly Bet Sizing
Fraction of your roll to put on a repeated +EV bet or position. Half Kelly shown too, since most pros bet less than full.
Double Stackup Pays, EV Screen
Walk past the machine, note the five meter values, plug them in. Reset / MHB: MEGA 200/350 · GRAND 150/250 · MAJOR 100/200 · MINOR 75/150 · MINI 50/125. Base RTP 86.78%.
| Jackpot | Current | Ripeness | vs Avg | Standalone EV/$ | Bonus over Avg |
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Advanced: adjust assumptions
Contribution rates from your data: MEGA 0.20% · GRAND 1.06% · MAJOR 1.53% · MINOR 1.86% · MINI 6.58%. Math: bonus EV per $1 wagered = Σ c·[(C+M)/(M−C) − (R+M)/(M−R)] in meter units, multiplied by k to convert to dollars and added to base RTP. Default k=0.29 is the best-fit value from 36 sessions ($76k wagered, +16.6% ROI). With this k, the calculator's weighted-average prediction matches actual ROI exactly. Increase for an aggressive read, decrease for a conservative one.
How to read it: Green at or above the +EV threshold means sit down. Gold means grindable but the house still has the edge. Red means move on. The single biggest EV swing comes from MINI, since it contributes 6.6% of every bet and cycles fastest. A MINI above 110 is a strong signal even if other meters are average. MEGA matters less per spin but is huge at 320 and up.