Statistics Calculators Calculators
Standard deviation, median, z-scores, probability and sample size.
Wahrscheinlichkeitsrechner
Work out how two events relate: independence, mutual exclusivity, conditional probability and Bayes’ theorem, with all four regions of the sample space.
Youden Index Calculator
Calculate Youden’s index (sensitivity + specificity − 1) from a 2×2 table of true and false positives and negatives, with balanced accuracy and likelihood ratios.
Wilcoxon Rank-Sum Test Calculator
Run the Wilcoxon rank-sum test (Mann–Whitney U) on two independent samples, with an exact p-value when possible, tie correction, continuity correction and effect size.
Z-score Calculator
Convert any value into a z-score, see how far it sits from the mean in standard deviations, and read its percentile rank in a normal distribution.
Z-test Calculator
Test a sample mean against a known population mean when the population standard deviation is known, with p-value, critical value and confidence interval.
t-statistic Calculator
Compute the t statistic for a one-sample, two-independent-sample or paired design, with Welch degrees of freedom, Cohen’s d and Hedges’ g.
t-test Calculator
Run a one-sample, two-independent-sample or paired Student’s t test with the p-value, confidence interval, decision and Cohen’s d.
p-value Calculator
Turn a test statistic into a p-value against the normal, t, chi-square or F distribution — or from a Pearson correlation — and see the decision.
About Statistics Calculators Calculators
This collection features 8 specialized calculators, formulas, and tools.
Statistics calculators for descriptive and inferential work: mean, median, mode, standard deviation, z-scores, normal distribution probabilities, confidence intervals and how many samples you need for a survey.