Statistical Calculators

Free statistical calculators to simplify your research analysis.

Calculator	Category	Description
Diagnostic Accuracy Sample Size	Sample Size	Calculate sample size for diagnostic accuracy studies	Open
Pilot Study Sample Size	Sample Size	Calculate sample size for pilot studies	Open
Two-Proportion Sample Size	Sample Size	Calculate sample size for comparing two proportions	Open
Sensitivity & Specificity	Diagnostic Test	Calculate sensitivity and specificity from a 2x2 table	Open
Diagnostic Test Characteristics	Diagnostic Test	Calculate comprehensive diagnostic test metrics	Open
Likelihood Ratio	Diagnostic Test	Calculate positive and negative likelihood ratios	Open
Post-Test Probability	Diagnostic Test	Calculate post-test probability using Bayes theorem	Open
ROC AUC	Diagnostic Test	Calculate receiver operating characteristic area under the curve	Open
NNT & NNH	Effect Size & Risk	Calculate number needed to treat and number needed to harm	Open
Odds Ratio to Risk Ratio	Effect Size & Risk	Convert odds ratio to risk ratio	Open
Confidence Interval	Effect Size & Risk	Calculate confidence intervals for various statistics	Open
Cohen's Kappa	Agreement & Reliability	Calculate inter-rater agreement for categorical data	Open
Intraclass Correlation (ICC)	Agreement & Reliability	Calculate intraclass correlation coefficient for reliability	Open
Bland-Altman Analysis	Agreement & Reliability	Assess agreement between two measurement methods	Open