Relative Risk Calculator


In the realm of statistics and risk assessment, the Relative Risk Calculator stands as a powerful tool, enabling researchers, analysts, and medical professionals to gauge the association between exposure to a potential risk factor and the likelihood of a particular outcome. This article delves into the functionality, application, and construction of such a calculator.

How to Use:

Utilizing the Relative Risk Calculator is straightforward. Input the number of subjects in each group, along with the number of subjects who experienced the outcome of interest in each group. Click on the “Calculate” button to obtain the relative risk value.


The formula for calculating relative risk is as follows:

Example Solve:

Consider a study investigating the association between smoking and lung cancer. The exposed group comprises 500 smokers, among whom 40 developed lung cancer. The unexposed group consists of 700 non-smokers, with 10 cases of lung cancer. Applying the formula:



Q: What does relative risk indicate?
A: Relative risk quantifies the likelihood of an outcome occurring in one group compared to another. A value greater than 1 suggests a higher risk in the exposed group, while a value less than 1 indicates a lower risk.

Q: Can relative risk be negative?
A: No, relative risk cannot be negative. It represents a ratio, and negative values are not feasible in this context.

Q: How reliable is relative risk in assessing causality?
A: While relative risk provides valuable insights, it does not establish causality on its own. Other factors such as study design, confounding variables, and statistical significance must be considered.


The Relative Risk Calculator serves as an indispensable tool for analyzing epidemiological data and assessing the association between exposure and outcome. By understanding its functionality and implications, researchers can make informed decisions in various fields, from public health to clinical research.

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