Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Expected Value Calculator

Compute the expected value (mean) of a discrete probability distribution by entering up to three outcomes and their probabilities. Ideal for decision analysis, gambling odds, and statistics coursework.

Outcome 1 Value

Outcome 1 Probability

Outcome 2 Value

Outcome 2 Probability

Outcome 3 Value

Outcome 3 Probability

Fill in the required fields to see your result.

Probability

Bayes' Theorem Calculator

Compute the posterior probability P(A|B) from a prior belief, a likelihood, and a false-positive rate. Use it for medical testing, spam filtering, or any scenario where you update beliefs with new evidence.

Prior Probability P(A)

Likelihood P(B|A)

Likelihood P(B|¬A)

Fill in the required fields to see your result.

Key differences

	Expected Value Calculator	Bayes' Theorem Calculator
Category	Probability	Probability
Inputs required	6	3
Result	Expected Value	Posterior Probability P(A\|B)
What it does	Compute the expected value (mean) of a discrete probability distribution by entering up to three outcomes and their probabilities. Ideal for decision analysis, gambling odds, and statistics coursework.	Compute the posterior probability P(A\|B) from a prior belief, a likelihood, and a false-positive rate. Use it for medical testing, spam filtering, or any scenario where you update beliefs with new evidence.