Calculate soul stone fusion success rates for gacha, RPG, and tabletop games. It helps gamers, designers, and streamers plan resource spending and optimize fusion strategies. Adjust variables to match current game meta and patch changes.
Soul Stone Fusion Rate Calculator
Calculate fusion success rates for gacha, RPG, and tabletop games
How to Use This Tool
Enter the base fusion success rate from your game’s current patch notes or in-game tooltip. Input the number of soul stones you plan to fuse in one session. Select any active bonus modifiers, such as event buffs or premium pass perks, from the dropdown. Add your current consecutive fusion streak if your game applies streak-based bonuses. Choose an RNG variance model that matches your game’s randomness: deterministic for fixed rates, low variance for most modern gacha games, or high variance for older or more RNG-heavy titles. Click Calculate Rates to see your full breakdown, or Reset to clear all fields.
Formula and Logic
Adjusted Success Rate = Base Rate + Bonus Modifier + (Streak × 2%), capped at 100%. Streak bonuses max out at 20% for 10+ consecutive fusions. Estimated Successes = (Number of Stones × Adjusted Success Rate) / 100. Failure Rate = 100% - Adjusted Success Rate. RNG Variance Range applies the selected ±% variance to the Adjusted Success Rate. Stones for 90% Success uses binomial probability to calculate how many stones are needed to have a 90% chance of at least one successful fusion.
- Streak Bonus: 2% per consecutive fusion, maximum 20%
- Bonus Modifiers: Flat percentage added to base rate, no cap beyond 100% total
- RNG Variance: Only affects displayed range, not core adjusted rate calculation
Practical Notes
Gaming-specific tips for using this calculator:
- Always check your game’s latest patch notes: Fusion rates are frequently adjusted in balance updates, especially for gacha titles.
- Streak bonuses may reset on a failed fusion in most games: Factor this into your streak input if you’ve had recent failures.
- RNG variance is not accounted for in in-game tooltips: Use the low or high variance models to set realistic expectations for actual gameplay.
- Tabletop game soul stone fusions may use fixed dice rolls instead of percentages: Convert your dice success rate to a percentage before inputting.
- Streamers and competitive players should note that some games track fusion stats per account: Use your personal average rate instead of the base rate for more accurate results.
Why This Tool Is Useful
Gamers can avoid wasting premium currency or rare soul stones by planning fusions around high success rates. Game designers can use the calculator to test balance changes before deploying patches. Streamers can show viewers exact odds during fusion sessions to build transparency. Competitive players can optimize resource spending to hit power spikes faster without overspending.
Frequently Asked Questions
Do fusion streak bonuses apply if I fuse different types of soul stones?
Most games only apply streak bonuses for consecutive fusions of the same soul stone type. Check your game’s rules before inputting a streak value for mixed fusion sessions.
Why is my adjusted success rate capped at 100%?
No game allows a fusion success rate higher than 100%, as this would guarantee success with no RNG. Any combined bonuses that exceed 100% are automatically capped in the calculator to match real game behavior.
Can I use this for tabletop RPG soul stone fusions?
Yes, convert your tabletop fusion dice roll success rate to a percentage first. For example, a 3/6 chance on a d6 equals a 50% base rate. The calculator works for any percentage-based fusion system.
Additional Guidance
For gacha game players: Save fusion bonuses for limited-time soul stones with higher base rates to maximize value. Event buffs often stack with streak bonuses, so plan fusions during active events to hit 100% adjusted rates. For game designers: Use the RNG variance models to test how much randomness affects player progression, and adjust base rates if variance causes too much player frustration. For streamers: Display the RNG variance range on-screen during fusion sessions to manage viewer expectations when failures occur.