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Statistical Calculators & Tools
Run statistical tests, estimate sample sizes, calculate probabilities, and export clear results -- without wrestling with formulas or software.
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Analysis toolkit
Popular calculators
Reliable tools for everyday statistical work and study.
Showing 1–6 of 8 calculators
Hypothesis testsFree
t-Test Calculator
Compare means and receive test statistics, intervals, and interpretation.
2-3 inputsExplore →
Sample sizeFree
Sample Size Calculator
Estimate the sample required for a target confidence and power.
GuidedExplore →
Effect sizeFree
Effect Size Calculator
Calculate Cohen's d, Hedges' g, odds ratios, and more.
8 measuresExplore →
ProbabilityFree
Normal Probability
Find areas, quantiles, and z-scores under a normal curve.
InteractiveExplore →
RegressionFree
Correlation Calculator
Measure linear association and test its statistical significance.
13 measuresExplore →
EstimationFree
Confidence Interval
Build intervals for means, proportions, differences, and ratios.
9 methodsExplore →