Probability Calculators
Permutations, combinations, coin tosses, dice odds, Bayes theorem, and odds ratios.
Bayes' Theorem Calculator
Calculate conditional posterior probability P(A|B), positive predictive value (PPV), false positives, and medical test accuracy.
Binomial Probability Calculator
Compute exact P(X=k) and cumulative binomial probabilities P(X≤k), P(X≥k), distribution mean, variance, and standard deviation.
Coin Flip Probability Calculator
Calculate probabilities for coin toss trials, exact heads/tails count, at least k heads, and consecutive streak probabilities.
Dice Probability Calculator
Calculate dice rolling probabilities for any number of dice across d4, d6, d8, d10, d12, d20, and d100 with exact, at least, and at most sums.
Hypergeometric Distribution Calculator
Calculate probabilities for sampling without replacement, card draws, lottery ball selections, and quality inspection batches.
Lottery Odds Calculator
Calculate jackpot and secondary tier odds for Powerball, Mega Millions, and custom multi-ball lotteries with expected value.
Normal Distribution Calculator
Calculate probabilities and percentiles for standard and general normal distributions, z-scores, and interval areas.
Odds Probability Calculator
Convert between probability percentages, decimal odds, fractional odds, and American moneyline odds with payout estimates.
Permutations and Combinations Calculator
Calculate combinations nCr and permutations nPr with or without repetition, factorial expansions, and subset ordering.
Poisson Distribution Calculator
Calculate Poisson probability P(X=k), cumulative event odds, and arrival rates per time or spatial interval.
Poker Odds Calculator
Evaluate 5-card poker hand probabilities, Texas Hold'em pot odds, hand equity, outs, and the Rule of 4 and 2.
Probability Calculator
Calculate the probability of single events, union of events, intersection, conditional probability P(A|B), and complements.
Frequently Asked Questions about Probability Calculators
Are the calculators in this category free to use?
Yes. All probability calculators on Calculat.dev are 100% free with no account registration or limits.
Are my calculation inputs saved on a database?
No. Every calculation executes client-side directly in your browser. No personal or numeric inputs are recorded or transmitted to any server.
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