Calculate the expected value of an uncertain outcome from a list of values and their probabilities.
How It Works
How Expected Value Calculator Works
Each possible outcome is multiplied by its probability of occurring, and those products are added together — the result is the long-run average result you'd expect if the same uncertain situation played out many, many times.
FAQ
Frequently Asked Questions
Does the expected value mean I should expect that exact result?
No — on any single try, you'll only ever get one of the actual listed outcomes, never the expected value itself unless it happens to match one exactly. It's a long-run average, most meaningful when a situation repeats many times.
What if my probabilities don't add up to 1?
The calculator will still compute a result, but it will flag that your probabilities don't sum to 1 — double-check that you've accounted for every possible outcome before trusting the answer.
