Expected Value Calculator

Expected Value (EV), also called mathematical expectation, is the probability-weighted average of all possible outcomes of a random variable. It represents the long-run average result if an experiment is repeated many times

The calculator uses the standard published formula for expected value. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: E(X) = Σ xᵢ × P(xᵢ) for all outcomes i. Each step in the calculation is shown so you can verify the result manually.