Geometric Distribution Calculator

Closed-form probability of an event occurring within N independent trials

Probability of success per trial

Decimal or fraction (e.g. 0.05, 1/20)

Number of trials (N)

Cumulative probability up to trial N

Probability Mass Function

P(X = k) — probability of first success on exactly trial k

< 2.5th percentile

95% CI

> 97.5th percentile

Your N