Gacha Standard Score Calculator

This tool can measure your gacha luck. Please enter the total number of pulls you've made and the number of limited 5-star characters/weapons obtained.

Number of Pulls
Primogems
Results will be displayed here.
About Standard Score

The standard score (or z-score) is a statistical indicator showing your position within a group. Generally, a score of 50 represents average luck.

  • Standard Score 60+: Very lucky (Top approx. 16%)
  • Standard Score 50-60: Luckier than average (Top approx. 34%)
  • Standard Score 40-50: Less lucky than average (Bottom approx. 34%)
  • Standard Score < 40: Very unlucky (Bottom approx. 16%)

Note: This tool provides reference values only. Actual gacha results are based on random probability.

Want to know more about Gacha Standard Score?

For details on calculation methods and statistical background, please see the article explaining Gacha Standard Score.

How to Calculate Gacha Standard Score

The steps to calculate the standard score from your Genshin Impact gacha results are as follows:

1

Enter Gacha Record

Enter the total number of pulls and the number of 5-star characters or weapons you have obtained.

2

Input Data

Provide the total pulls and 5-star count in the form above.

3

Calculate

Click the "Calculate" button to see your standard score.