Research Statistics Calculators
Statistics calculators for research include confidence intervals for means and proportions, Cohen’s d and other effect sizes, odds and risk ratios, statistical power, and forest-plot generators for meta-analysis. Every calculator uses formulas from established statistics textbooks and runs entirely in the browser — no account, no upload, no API call.
Effect Size Calculator with Cohen's d and Hedges' g
Compute Cohen's d, Hedges' g, and Glass's delta with confidence intervals from summary stats, raw data, or a t/F/r value. Runs in your browser, zero uploads.
Calculated locally · nothing uploaded Use tool →Confidence Interval Calculator
Calculate 95% confidence intervals for means, proportions, and group differences. Runs in your browser, zero uploads. Copy a manuscript-ready APA sentence.
Calculated locally · nothing uploaded Use tool →Odds Ratio Calculator with Risk Ratio Converter
Calculate odds ratio with 95% CI from a 2×2 table, then convert between OR and RR with the Zhang-Yu formula. Runs in your browser. Matches R's epitools.
Calculated locally · nothing uploaded Use tool →
Quick statistics without opening R or SPSS. Confidence intervals, effect sizes, odds ratios — with the formula shown so you can cite the method.