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Geometric Distribution Calculator
All statistics tools
Calculate probabilities for the number of trials needed to get the first success.
Statistics
Probability of Success (p)
Number of Trials (k)
Probabilities
Exact: P(X = k)
12.5000%
P(X=k)
Cumulative: P(X ≤ k)
87.5000%
P(X≤k)
Mean (1/p)
2.00
Trials
Variance
2.00
About this calculator
Overview
The geometric distribution models the number of Bernoulli trials needed to get one success. For example, flipping a coin until it lands on heads.
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Pro Tips
Probability 'p' must be between 0 and 1.
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Fun Facts
"The geometric distribution is 'memoryless', meaning past failures don't affect future probabilities."
"The mean is simply 1/p."
