Statistical Calculator
A comprehensive suite of statistical tools for students and professionals. Each calculator shows formulas, step-by-step calculations, and plain English interpretations.
Sample Size Calculator
Determine the required sample size for surveys and experiments with support for both finite and infinite populations.
Confidence Interval Calculator
Calculate confidence intervals for means and proportions using z or t distributions.
Hypothesis Test Calculator
Perform hypothesis tests for means and proportions with p-value calculations.
Seasonal Index Calculator
Calculate seasonal indices using the ratio-to-moving-average method for time series analysis.
ANOVA & Regression
Perform one-way ANOVA tests and simple linear regression analysis.
Linear Programming
Solve linear programming problems with multiple constraints using the graphical or simplex method.
Educational Focus
Each calculator is designed to be educational. You will see the formulas used with actual numbers substituted, along with clear interpretations of results. This helps you understand not just the answer, but how it was calculated and what it means.
Open Source & Community
StatCalc is open source! Found a bug? Have a feature request? We welcome contributions and feedback from the community.