Stats Calculator Online
Hypothesis Testing Calculators
Parametric and non-parametric tests for means, proportions, and ranks. Free tools on Stats Calculator Online with formulas, how-to steps, similar calculator widgets, tidbits, and exportable reports.
- One-Sample t-Test CalculatorTest a sample mean against a hypothesized value
- One-Sample Z-Test CalculatorZ-test when population SD is known
- Two-Sample t-Test CalculatorPooled or Welch t-test for two independent means
- Two-Sample Z-Test CalculatorCompare two means with known population SDs
- Paired t-Test CalculatorCompare paired observations
- One-Way ANOVA CalculatorCompare means across three or more groups
- Two-Way ANOVA CalculatorTwo-factor ANOVA with interaction
- Three-Way ANOVA CalculatorThree-factor ANOVA overview calculator
- Welch ANOVA CalculatorANOVA without equal-variance assumption
- Repeated Measures ANOVA CalculatorWithin-subjects ANOVA
- ANCOVA CalculatorANOVA with a continuous covariate
- MANOVA CalculatorMultivariate analysis of variance
- Tukey HSD CalculatorPost-hoc pairwise comparisons after ANOVA
- Scheffe Test CalculatorConservative post-hoc comparisons
- Dunnett Test CalculatorCompare treatments to a control
- Games-Howell Test CalculatorPost-hoc for unequal variances
- Kruskal-Wallis Test CalculatorNon-parametric one-way ANOVA
- Friedman Test CalculatorNon-parametric repeated measures
- Dunn Test CalculatorPost-hoc for Kruskal-Wallis
- Mann-Whitney U Test CalculatorNon-parametric two-sample rank test
- Wilcoxon Signed-Rank CalculatorNon-parametric paired test
- Chi-Square Goodness of Fit CalculatorCompare observed frequencies to expected
- Chi-Square Independence CalculatorTest association in contingency tables
- Fisher Exact Test CalculatorExact test for 2x2 tables
- One-Proportion Z-Test CalculatorTest a single proportion
- Two-Proportion Z-Test CalculatorCompare two proportions
- Binomial Test CalculatorExact test for a binary proportion
- McNemar Test CalculatorPaired binary proportions
- Levene Test CalculatorTest equality of variances
- Normality Test CalculatorJarque-Bera / normality diagnostics
- Outlier Detection CalculatorGrubbs test for outliers
- Permutation Test CalculatorResampling-based mean comparison
- P-Value Calculator CalculatorConvert test statistics to p-values
- Critical Value Calculator CalculatorFind Z, t, F, or chi-square critical values
- Effect Size CalculatorCohen d, Hedges g, and related effect sizes
- Standard Error CalculatorSE of the mean and related estimators
- Sample Size & Power CalculatorPlan sample size for desired power
- Statistical Test Selector CalculatorInteractive guide to choose the right test
- Bartlett’s Test CalculatorHomogeneity of variances across groups
- Hartley’s Fmax CalculatorRatio of largest to smallest group variance
- Bonferroni Correction CalculatorAdjust p-values for multiple comparisons
- Chi-Square Homogeneity CalculatorCompare categorical distributions across populations
- Equivalence TOST CalculatorTwo one-sided tests for mean equivalence
- ROC / AUC Calculator CalculatorAUC, sensitivity, and specificity from scores
Tidbits from Stats Calculator Online
Everyday math
Percent change ≠ percent of
Percent of is part÷whole. Percent change uses the starting value in the denominator—and +50% then −50% does not return to start.
Percentage calculators →Quick tip
Sample vs population SD
Use n−1 (sample) when your data are a subset of a larger group; use n when you truly have the whole population.
Open SD calculator →Tidbit
A p-value is not the probability H₀ is true
It is the probability of data at least as extreme as yours if H₀ were true. Pair it with an effect size and confidence interval.
P-value calculator →
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