Statistics
Statistics Calculators
Correlation, regression, probability distributions, and variability measures.
28 tools
Average Return Calculator
Average return calculator: simple average of yearly returns.
Bayes Theorem Calculator
Bayes theorem calculator: posterior probability P(A|B) from prior and likelihood rates.
Binomial Probability Calculator
Binomial probability calculator: exact and cumulative probabilities for k successes in n trials.
Chi-Square Goodness of Fit Calculator
Chi-square calculator: goodness-of-fit test statistic from observed vs expected counts.
Cohen's D Calculator
Cohen's d calculator: effect size between two groups.
Combinations and Permutations Calculator
Combinations and permutations calculator: count arrangements and selections with or without repetition.
Conditional Probability Calculator
Conditional probability calculator: P(A|B) from the intersection.
Correlation Coefficient Calculator
Correlation coefficient calculator: Pearson r between two paired data sets, with strength and direction.
Expected Value Calculator
Expected value calculator: EV from two outcomes with probabilities and values.
Five Number Summary Calculator
Five number summary calculator: min, quartiles, median, max, IQR and outliers.
Geometric Distribution Calculator
Geometric distribution calculator: first success on trial k.
Geometric and Harmonic Mean Calculator
Geometric and harmonic mean calculator: multiplicative-average measures for rates, ratios, and growth data.
Harmonic Mean Calculator
Harmonic mean calculator: n divided by the sum of reciprocals.
IQR Calculator
IQR calculator: interquartile range from five values.
Independent Events Calculator
Independent events calculator: probability both events happen.
Linear Regression Calculator
Linear regression calculator: slope, intercept, and R-squared for a least-squares line through paired data.
Margin of Error Calculator
Margin of error calculator: sampling error for a survey at a chosen confidence level.
Moving Average Calculator
Moving average calculator: simple moving average of a series.
Normal Distribution Probability Calculator
Normal distribution probability calculator: area under the curve for a value, above a value, or between two values.
Odds Ratio Calculator
Odds ratio calculator: association from a 2x2 table.
Outlier Calculator
Outlier calculator: flag outliers by the 1.5x IQR rule.
P Value Calculator
P value calculator: two-tailed p-value from a z-score.
Percentage Error Calculator
Percentage error calculator: measured vs true value as a percentage, for labs and measurements.
Permutation Combination Calculator
Permutation and combination calculator: nPr and nCr.
Poisson Probability Calculator
Poisson probability calculator: probability of exactly k events given a mean rate.
Skewness Calculator
Skewness calculator: asymmetry of a sample distribution.
T Test Calculator
T test calculator: two-sample t statistic and significance.
Z Test Calculator
Z test calculator: z-score for a sample mean vs a known population.