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Loot Drop & RNG Probability Simulator

Calculate cumulative probabilities for gacha pulls, MMO item drops, and run simulated roll streaks.

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1. Probability Parameters

2. Exact Math & Simulation

Chance of ≥ 1 Drop
41.8%
Pulls needed for 99% certainty: ~765
Click Run Simulation to test random drop RNG.
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How to Use the Loot Drop & RNG Probability Simulator

  1. 1
    Enter base drop rate percentage (e.g. 0.6% for 5-star characters).
  2. 2
    Enter total number of attempts/pulls.
  3. 3
    View mathematical probability of at least one drop and test simulated luck.

Practical Example & Use Case

Common Real-World Scenario

Discovering that 90 pulls at a 0.6% rate only gives a 41.8% chance of getting the item without pity mechanics.

Technical Notes & Limitations

Browser Engine Architecture

Calculates standard independent binomial trials without game-specific pity counters.

Frequently Asked Questions

Why is 100 pulls at 1% not guaranteed?

Because each pull is independent. 100 pulls at 1% actually only yields a ~63.4% chance of success.