🧮Gacha Probability Calculator

Enter the rate and number of pulls to analyze mathematical success chances and costs.

Chance of winning at least once

0%

Pulls needed for Target Probability

TargetRequired PullsEst. Cost

Understanding Gacha and Independent Trials

The Independent Trials system used in most games means that previous results have no impact on the next outcome. For example, failing a 1% gacha 99 times does not increase your chance on the 100th pull. This mathematical reality often leads users into the **Gambler's Fallacy**, the error of thinking a win is "due" after several failures.

The Simplewoody Gacha Probability Calculator strips away the emotion and shows the cold, hard numbers. While the chance of winning at least once rises as a curve with more attempts, it never technically reaches 100%. Use this tool to judge the risks you are taking within your budget and avoid emotional overspending.

Frequently Asked Questions (FAQ)

Q: If the rate is low, does more attempts guarantee a win?

A: Statistically, it converges to 100%, but mathematically, a 100% guarantee is never possible. This is the nature of independent trials.

Q: Why is the result different from real gameplay?

A: This tool provides pure probability. Real games may have 'pity' systems that guarantee an item after a certain count. Check your game's official notice.

Q: What is the recommended target probability?

A: Generally, 90% to 95% is considered a 'safe zone' by most experienced players. However, remember there is always a small chance of failure.