Mathematics category
Probability calculators
Chance models, event relationships and distributions.
242 calculators in this category. Page 1 of 6.
242 calculators available. Search data loads only when you use this field.
Probability
Calculate event probability from favourable and total equally likely outcomes.
Open calculator ProbabilityCombinations and permutations
Count selections when order either matters or does not matter.
Open calculator ProbabilityOdds to probability
Convert odds in favour into probability, percentage probability and odds against.
Open calculator ProbabilityProbability complement
Calculate the probability that an event does not occur.
Open calculator ProbabilityIndependent event union
Calculate the chance that at least one of two independent events occurs.
Open calculator ProbabilityConditional probability
Calculate P(A given B) from the intersection and conditioning event.
Open calculator ProbabilityExpected value
Calculate the weighted mean of three possible outcomes.
Open calculator ProbabilityBinomial exact probability
Calculate exactly k successes in n independent equal-probability trials.
Open calculator ProbabilityBinomial mean and variance
Calculate expected successes, variance and standard deviation.
Open calculator ProbabilityPoisson probability
Calculate the probability of exactly k events at an average rate λ.
Open calculator ProbabilityBayes theorem
Update a prior probability after a positive observation.
Open calculator ProbabilityBinomial Expected Successes
Calculate expected successes from success probability and trial count.
Open calculator ProbabilityBinomial Expected Successes: solve success probability
Rearrange the binomial expected successes relationship and solve for success probability.
Open calculator ProbabilityBinomial Expected Successes: solve trial count
Rearrange the binomial expected successes relationship and solve for trial count.
Open calculator ProbabilityIndependent Event Union
Calculate probability of a or b from probability of a and probability of b.
Open calculator ProbabilityIndependent Event Union: solve probability of A
Rearrange the independent event union relationship and solve for probability of a.
Open calculator ProbabilityIndependent Event Union: solve probability of B
Rearrange the independent event union relationship and solve for probability of b.
Open calculator ProbabilityRepeated Outcome Tree Count
Calculate terminal paths from outcomes per stage and independent stages.
Open calculator ProbabilityRepeated Outcome Tree Count: solve outcomes per stage
Rearrange the repeated outcome tree count relationship and solve for outcomes per stage.
Open calculator ProbabilityRepeated Outcome Tree Count: solve independent stages
Rearrange the repeated outcome tree count relationship and solve for independent stages.
Open calculator ProbabilityOdds from Outcome Counts
Calculate odds ratio from favourable outcome count and unfavourable outcome count.
Open calculator ProbabilityOdds from Outcome Counts: solve favourable outcome count
Rearrange the odds from outcome counts relationship and solve for favourable outcome count.
Open calculator ProbabilityOdds from Outcome Counts: solve unfavourable outcome count
Rearrange the odds from outcome counts relationship and solve for unfavourable outcome count.
Open calculator ProbabilityLikelihood Ratio
Calculate likelihood ratio from likelihood under first hypothesis and likelihood under second hypothesis.
Open calculator ProbabilityLikelihood Ratio: solve likelihood under first hypothesis
Rearrange the likelihood ratio relationship and solve for likelihood under first hypothesis.
Open calculator ProbabilityLikelihood Ratio: solve likelihood under second hypothesis
Rearrange the likelihood ratio relationship and solve for likelihood under second hypothesis.
Open calculator ProbabilityPosterior Odds Update
Calculate posterior odds from prior odds and bayes factor.
Open calculator ProbabilityPosterior Odds Update: solve prior odds
Rearrange the posterior odds update relationship and solve for prior odds.
Open calculator ProbabilityPosterior Odds Update: solve Bayes factor
Rearrange the posterior odds update relationship and solve for bayes factor.
Open calculator ProbabilityRelative Frequency Ratio
Calculate relative frequency from observed event count and total observation count.
Open calculator ProbabilityRelative Frequency Ratio: solve observed event count
Rearrange the relative frequency ratio relationship and solve for observed event count.
Open calculator ProbabilityRelative Frequency Ratio: solve total observation count
Rearrange the relative frequency ratio relationship and solve for total observation count.
Open calculator ProbabilityIndependent Event Intersection
Calculate probability of a and b from probability of event a and probability of event b.
Open calculator ProbabilityIndependent Event Intersection: solve probability of event A
Rearrange the independent event intersection relationship and solve for probability of event a.
Open calculator ProbabilityIndependent Event Intersection: solve probability of event B
Rearrange the independent event intersection relationship and solve for probability of event b.
Open calculator ProbabilityBayes Numerator
Calculate unnormalized posterior weight from prior probability and evidence likelihood.
Open calculator ProbabilityBayes Numerator: solve prior probability
Rearrange the bayes numerator relationship and solve for prior probability.
Open calculator ProbabilityBayes Numerator: solve evidence likelihood
Rearrange the bayes numerator relationship and solve for evidence likelihood.
Open calculator ProbabilityAt Least One Event from Failure Probabilities
Calculate probability of at least one success from failure probability for first independent event and failure probability for second independent event.
Open calculator ProbabilityAt Least One Event from Failure Probabilities: solve failure probability for first independent event
Rearrange the at least one event from failure probabilities relationship and solve for failure probability for first independent event.
Open calculator ProbabilityAt Least One Event from Failure Probabilities: solve failure probability for second independent event
Rearrange the at least one event from failure probabilities relationship and solve for failure probability for second independent event.
Open calculator ProbabilityBinary Log-Loss Contribution
Calculate log-loss contribution from outcome weight and predicted probability assigned to outcome.
Open calculator ProbabilityBinary Log-Loss Contribution: solve outcome weight
Rearrange the binary log-loss contribution relationship and solve for outcome weight.
Open calculator ProbabilityBinary Log-Loss Contribution: solve predicted probability assigned to outcome
Rearrange the binary log-loss contribution relationship and solve for predicted probability assigned to outcome.
Open calculator ProbabilityEntropy Category Contribution
Calculate entropy contribution in nats from category probability weight and same category probability.
Open calculator ProbabilityEntropy Category Contribution: solve category probability weight
Rearrange the entropy category contribution relationship and solve for category probability weight.
Open calculator ProbabilityEntropy Category Contribution: solve same category probability
Rearrange the entropy category contribution relationship and solve for same category probability.
Open calculator ProbabilityPoisson Mean from Rate and Exposure
Calculate expected event count from event rate per exposure unit and total exposure.
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