MedCalc's free online Relative risk statistical calculator calculates Relative risk and Number needed to treat (NNT) with 95% Confidence Intervals from a 2x2 table.

The relative risk calculator can be used to estimate the relative risk (or risk ratio) and its confidence interval for two different exposure groups. Enter the data into the table below, select the required …

Aug 26, 2021 · This tutorial explains how to interpret relative risk, including several examples.

Relative risk is the ratio of the probability of an adverse outcome in an exposure group divided by its likelihood in an unexposed group. This statistic indicates whether exposure corresponds to …

Jul 24, 2025 · To calculate relative risk, first determine the incidence of the event in the exposed group. This is done by dividing the number of exposed individuals who experienced the event (A) by the …

Use this relative risk calculator to easily calculate relative risk (risk ratio), confidence intervals and p-values for relative risk between an exposed and a control group.

Oct 22, 2025 · Master the Relative Risk calculation. Decode how researchers compare risk between groups and why this differs significantly from absolute risk.

Jan 19, 2026 · Calculate relative risk from exposed and control group outcomes. All calculations rely strictly on established statistical formulas. Please refer to MedCalc for more details. All calculations …

Aug 5, 2024 · Relative risk is a statistical term used to describe the chances of a certain event occurring among one group versus another. It is commonly used in epidemiology and evidence-based …

Our Relative Risk Calculator helps healthcare professionals, researchers, and students determine the risk ratio between exposed and unexposed groups. This essential epidemiological tool provides …