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 …

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 …

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.

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 …

This tool calculates the Relative Risk (RR) which compares the probability of an outcome occurring in an exposed group versus a non-exposed group. Interpret the results based on the calculated values and …

Feb 21, 2025 · Calculate Relative Risk (RR) with this easy-to-use tool. Enter events and non-events for exposed and unexposed groups to evaluate risk differences. Ideal for epidemiology and clinical studies!

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

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

Mar 28, 2025 · Understanding relative risk is crucial for evaluating the impact of exposure to specific factors on health outcomes. This guide provides a comprehensive overview of relative risk, including …