# Calculate > Probability Distributions > Geometric

This utility computes the probability density, cumulative probability, and inverse cumulative probability of the geometric distribution. You can choose between the two variants of the geometric distribution: (1) the probability distribution of the number of trials needed to get the first success, and (2) the probability distribution of the number of failures before the first success.

#### Distribution Parameters:

- Specify the success probability (must be between 0 and 1).
- Choose the variant of the geometric distribution:
  - Model the number of trials needed to produce the first success
  - Model the number of failures before the first success

#### Compute:

- Select the desired type of computation.

#### Input(s):

- If the input data is in a column in the current Datasheet, select the Column radio button and the column name in the drop-down menu.
- In the input data is a single constant, select the Constant radio button and enter the input value in the provided text box.

#### Store Results in: (optional)

- Computed results can be stored in a column of the current Datasheet. If storing results is desired, enter the column name or variable name in the provided text box.