A free online tool for calculating probabilities of events following geometric distribution.

The geometric distribution gives the probability that the first occurrence of a success
requires **x** independent trials, each with the success probability **p**. The probability **P**
that the **x**-th trial is the first success is described by the formula:

P(X=x) | = | p(1-p)^{x-1} |

x>0, 0<p<1

Clear

Calculate

Probability of success in one trial:p =

P(X = x):

P(X ≤ x):

P(X ≥ x):

Mean: