Expected Value Calculator

Enter outcome and probability pairs to calculate expected value, variance, standard deviation, and probability total.

Outcome, probability pairs

—Expected value E[X]

—Variance

—Standard deviation

—Probability total

—Probabilities should normally sum to 1.

How to use this Expected Value Calculator

Calculate expected value and variance for a discrete probability distribution. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.