Gacha System Simulator

Online games often offer "rare item drop, " allowing users to get items on chance. However, the probability of getting an item is relatively low, you usually need to try many times to get one.
Here is a simulator for such situations, you can estimate how many times you need to try to get one.
This simulator works on your browser, you don't need Excel or macros.


% lottery trials. The winning probability: (%)

Simulation: trials. Success: . Ratio: %
( trials, win: , ratio: %)

※Simulation will be here.


When you draw a lottery of 1% 100 times, the probability of winning is 63.4%. You may feel 63.4% is low. Mathematics sometimes contradicts our intuition.

The Birthday Paradox is a famous example for this.


Tags:   probability   math   simulation