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Select a Jackpot, then one of its Indexes, then a Type (STANDARD or READ_ONLY). The settings fields and calculation preview appear after you select a type.
  • STANDARD: Wins occur randomly, so individual payouts vary. Across a large number of wins, the system is designed to keep the average close to the intended value. The jackpot balance grows from accumulated contributions; after a win, it resets to the start balance. The calculator previews average win and jackpot RTP from the entered settings.
  • READ_ONLY: The service increases the balance on scheduled ticks, with a small random variation. At the end balance, it records the completed win and resets to the start balance. The calculator previews the tick increase and estimated number of ticks.

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Index names

After selecting a jackpot, Index shows only its associated indexes: Changing the jackpot clears the selected index and type. The index identifies the jackpot settings being edited; it does not alter the calculations below.

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Copy the entered values

After entering valid settings, click Copy JSON to copy the JSON shown beneath the calculation. It includes the selected jackpot, index, type, and entered settings. The JSON is a summary of these values; copying it does not save any settings.

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STANDARD calculations

For a STANDARD group, enter Start Balance, Bets to Win, and Contribution Percentage. Let B be Start Balance in the jackpot currency, N be Bets to Win, and C be the entered Contribution Percentage. Enter 1 for 1%. The calculator converts balances and bet counts to cents before calculating, then displays Average Jackpot Win in currency units and Jackpot RTP as a percentage. Both displayed values are rounded to two decimal places. The CLOVER_7 branch uses a fixed contribution value of 100 and fixed bet value of 1. When Bets to Win or Contribution Percentage is empty or zero, the calculator displays zero for both values.

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READ_ONLY calculations

For a READ_ONLY group, enter Start Balance, Tick Increment, and End Balance. The jackpot service attempts a tick every 10 seconds. On each tick it varies Tick Increment by a random positive or negative 5–10%, then caps the increase at the remaining distance to End Balance:
The calculator shows the possible per-tick increase from 0.9 × Tick Increment to 1.1 × Tick Increment, before the End Balance cap. Its tick-count range is a theoretical estimate from Start Balance: divide the remaining balance by 1.1 × Tick Increment for the fastest case and by 0.9 × Tick Increment for the slowest case, rounding each result up. Actual timing depends on which scheduled ticks run and the random variation. When the jackpot reaches End Balance, the service records that win and resets the current balance to Start Balance. Tick Increment of zero or less does not advance the jackpot. For READ_ONLY, the calculator shows tick growth instead of Average Jackpot Win and Jackpot RTP. Its preview is calculated in your browser and does not change jackpot settings.