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Molbiotools is a collection of free online apps:

DNA Sequence Tools
Text and Data Tools
Lab Calculators
Math Calculators

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Negative Binomial Distribution

Negative binomial distribution describes the probability that the x-th independent trial will be the k-th success provided each success has the same probability p:
P(X=x) = (
x-1
k-1
) (1-p)x-k pk
Alternatively, the distribution describes the probability of the next independent trial being the k-th success after a fixed number r of failures have occurred:
P(k, r) = (
k+r-1
k-1
) (1-p)r pk

x>0, k>0, x≥k, r≥0, 0<p<1; x = k + r

Clear
Calculate

Calculator

Probability of success in one trial:p =

Number of successes:k =

Calculate the probability that the x-th trial will be the k-th success:
x = , or alternatively, set the number of failures:r =
Calculate the total probability of all values x from the interval x1 - x2:
x1 = x2 =

P(X = x):

P(X ≤ x):

P(X ≥ x):

Mean:

Tool Description

Negative Binomial Distribution Calculator is a free online tool for calculations of probabilities of events following negative binomial distribution.

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