Survey sample size calculator
Estimate responses needed for a population proportion with a target margin.
Open calculatorStatistics & probability
Summarize data, explore chance and understand uncertainty.
Showing 73–96 of 97 tools
Binomial probability calculator
Find the chance of an exact number of successes in repeated trials.
Open calculatorCombinations calculator
Count unordered selections without replacement.
Open calculatorPermutations calculator
Count ordered selections without replacement.
Open calculatorPoisson distribution calculator
Find exact-count and cumulative probabilities for events in a fixed interval.
Open calculatorHypergeometric probability calculator
Calculate an exact success-count probability for sampling without replacement.
Open calculatorGeometric distribution calculator
Find when the first success occurs in independent trials with a constant probability.
Open calculatorNormal distribution probability calculator
Find the normal area between two bounds and in the tails outside them.
Open calculatorExponential waiting time calculator
Estimate the chance of a wait ending before a chosen time under a constant-rate model.
Open calculatorBayes theorem calculator
Update a prior probability using evidence likelihoods and inspect the expected groups.
Open calculatorMoment-generating function calculator
Evaluate a known distribution’s MGF and inspect its logarithm, domain, mean and second moment.
Open calculatorStem-and-leaf plot generator
Preserve repeated observations in an ordered plot with an explicit leaf unit and negative-value key.
Open calculatorSample percentile calculator
Find a sample percentile, quartiles and IQR using an explicitly chosen convention.
Open calculatorPercentile rank calculator
Compare strict-below, at-or-below and midpoint-tie ranks for a value in a sample.
Open calculatorGrouped frequency table calculator
Group observations into equal-width bins with counts, relative frequencies and cumulative totals.
Open calculatorSimple linear regression calculator
Fit a straight line to paired data and inspect correlation, residuals and a prediction.
Open calculatorPaired before and after change calculator
Keep observations matched while summarizing individual changes and their spread.
Open calculatorTrailing moving average forecast calculator
Create rolling one-step forecasts without including the period being predicted.
Open calculatorSimple exponential smoothing calculator
Inspect prior-level forecasts and updated levels with a stated initialization and smoothing factor.
Open calculatorForecast error MAE RMSE and percentage calculator
Evaluate aligned actual and predicted values with explicit bias and zero-denominator conventions.
Open calculatorSpearman rank correlation with ties calculator
Preserve pairing and use average tied ranks to describe monotonic association.
Open calculatorArithmetic geometric and harmonic mean calculator
Compare three equal-weight averages of positive data and understand their different meanings.
Open calculatorBinary confusion matrix precision recall and F1 calculator
Evaluate four fixed classification counts without hiding undefined metrics or changing the positive class.
Open calculatorDiscrete Shannon entropy calculator
Normalize category weights and compare uncertainty with an equal-category reference.
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