Compute sample sizes, run hypothesis tests, analyse your own datasets, and create publication-ready plots, entirely in your browser. No software to install. No data uploaded to any server.
A growing suite of calculators designed for researchers, students, and health professionals.
Plan your study with precision. Calculators for single proportions, single means, two independent groups, and paired designs, with adjustments for clustering, finite populations, and response rates.
Explore Sample Size →Upload a CSV to explore summary statistics, run pairwise statistical tests, and create publication-quality charts with 27 graph types. All processing happens locally in your browser.
Explore a Dataset →Run one-sample, two-sample, and paired t-tests, chi-square tests, stratified analyses, and goodness-of-fit tests. Each calculator provides a plain-language interpretation alongside full statistical details.
Explore Tests →Estimate population parameters with confidence. Calculate intervals for a single proportion (Wald, Wilson, Exact methods) or a single mean (z and t distributions), with interactive visualisations.
Explore CIs →Download results as PDF reports, export charts as images, and save tables as CSV files. Every calculator includes a formatted citation you can use in publications.
Three steps to results you can trust.
Pick a sample size calculator, a hypothesis test, or a dataset tool (Stat Analysis or StatPlot). Each page explains what inputs are needed and when to use it.
For calculators, type in your summary statistics. For dataset tools, upload a CSV or paste a table directly from Excel or Google Sheets. Hover over the help icons for guidance on each input. Results update as you change values.
Statulator computes the answer and explains it in plain language. Switch between the Visualisation and Tabulate tabs to explore how changing inputs or variables affects your results, then download tables, charts, and full PDF reports with one click.
Your data never leaves your computer. Every calculation runs locally in JavaScript.
No registration, no subscription, no limits. Statulator is free to use.
Each calculator provides a formatted reference so you can cite Statulator in your publications.