# Chance Calculator

category：probability

## Table of contents

### Simple Gacha Calculator（External link）

This page displays the graph of Cumulative Distribution Function, Probability Mass Function, and Item Count Distribution.

## Chance Calculator

### When loot box of 1% chance is performed 100 times, the chance to get one or more is

### The chance to get m or more when loot box of p% chance is performed n times is

### To get with n% chance, when the probability of hitting is p%, required trials are

## Box Gacha

### The chance to get one or more when a box gacha is performed n times

In this calculator it is assumed that all prizes will come out with equal probability.

### The chance to get everything when box gacha is performed n times

In this calculator it is assumed that all prizes will come out with equal probability.

## Kompu Gacha

### Expected value of the number of times of trials necessary to hit everything when kompu gacha with n varieties

__This is expected value, NOT PROBABILITY. The probability of hitting everything in expected value is about 64 %__.

### The chance to get everything when kompu gacha of n varieties is performed m times

__Since the probability is calculated with expected value, when m is small(m < 20), precision is low__.