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Gamma Distribution CDF Calculator



α is the shape parameter (k).
β is the scale parameter (λ).

In other parameterizations, 1/β is the rate parameter.

See the Statistical Distributions Overview page for more statistical distribution calculators.

Example 1

Value Keystrokes Display Description
.8 x 0.8 Stores the x value.
1 α 1.0 Stores the α value.
2 β 2.0 Stores the β value.
  cdf 0.3297 Calculates the cdf

Example 2 - Solving for the inverse

Value Keystrokes Display Description
.05 cdf 0.050 Stores the cdf target value.
  x 0.1026 Solves for the x value


This Function Calculator can also solve for α and β values.


Gamma distribution - Wikipedia