Probability and odds calculations
Free expected value calculator. Enter values and probabilities as decimals, percentages or fractions and get E(X), the variance,…
Calculate sensitivity, specificity, accuracy, PPV, NPV, and positive/negative likelihood ratios from a 2x2 diagnostic table.…
Calculate the average dice roll for any number and type of dice (d4, d6, d8, d10, d12, d20, d100 or custom) with an optional…
Calculate the number of permutations nPr = n!/(n−r)! where order matters. Get permutations with repetition, the related combination…
Calculate posterior probability using Bayes' theorem. Enter prior probability P(A), likelihood P(B|A), and false positive…
Calculate the probability of at least one, all three, exactly one, or none of three independent events occurring. Enter P(A),…
Calculate your exact probability of winning any lottery using the hypergeometric formula. Enter pool size, balls drawn, and…
Generate random integers or decimals in any range up to ±999,999,999,999,999. Supports single and multiple numbers, no-repeat…
Calculate probability of winning and losing from any odds ratio. Convert between fractional (UK), decimal (European), and…
Calculate combinations C(n,k) and permutations P(n,k) with or without repetition. Generate all possible combinations up to…
Calculate post-test probability using Bayes' theorem. Enter confusion matrix or sensitivity/specificity to find positive…
Calculate dice roll probabilities for d4, d6, d8, d10, d12, d20 polyhedral dice. Find exact, at-least, at-most, and binomial…
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