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Gacha Probability Calculator

Analyze the mathematical odds and cost of hitting a gacha item.

e.g. 0.5
%
currency
times

Chance of at least one hit

39.42%

๐Ÿ”ด Odds are low โ€” avoid overspending.

Reach 99% confidence
919ํšŒ ยท 1,102,800์›
Reach 90% confidence
460ํšŒ ยท 552,000์›
Reach 70% confidence
241ํšŒ ยท 289,200์›
Reach 50% confidence
139ํšŒ ยท 166,800์›
Reach 30% confidence
72ํšŒ ยท 86,400์›
Reach 10% confidence
22ํšŒ ยท 26,400์›

How it works

Independent trials mean past pulls never influence future ones โ€” 99 failures on a 1% item don't raise your 100th-pull odds. Believing otherwise is the gambler's fallacy. Total odds come from the complement rule: 1 - (1-p)^n. The curve rises with more attempts but never quite reaches 100%.

FAQ

Q. If I keep trying, am I guaranteed to get it eventually?

A. It converges toward 100% statistically, but mathematically no finite number of attempts guarantees success.

Q. Why might real results differ from this calculator?

A. This shows the pure probabilistic expectation. Real games may have pity systems layered on top โ€” check the game's own notice.

Q. What target confidence level is recommended?

A. 90โ€“95%+ is generally considered a safe zone โ€” but remember a 5โ€“10% chance of failure still remains.

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