How to Use the Gacha Rate Verification Calculator
Enter the game's advertised drop rate, your total pulls, and how many times you hit to statistically verify whether your results deviate significantly from the stated probability. Uses a normal approximation to the binomial test (Z-score method).
A |Z-score| ≥ 1.96 indicates a statistically significant deviation at the 95% confidence level. However, both bad luck and good luck fall into this range — a larger sample size makes the test more reliable. At least 100 pulls is recommended for meaningful results.
Frequently Asked Questions
It measures how many standard deviations your actual result is from the expected value. |Z| ≥ 1.96 suggests the deviation is unlikely to be random chance alone at 95% confidence.
No — small samples have high natural variance. You need at least 100+ pulls for the test to be statistically meaningful.
You can submit data to the game developer's support team. However, formal legal action requires a much larger dataset and professional statistical analysis.