Relative Risk Calculator

Calculate relative risk (risk ratio) with confidence intervals

Exposed Group

Events (a):

Total (n1):

Unexposed Group

Events (c):

Total (n2):

Confidence Level:

About Relative Risk

Relative risk (RR) compares the risk of an event between two groups. It is the ratio of the probability of the event in the exposed group to the probability in the unexposed group.

Formula: RR = (a/n1) / (c/n2)

RR > 1 indicates increased risk, RR < 1 indicates decreased risk, and RR = 1 indicates no association.

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Editorial Note

MyCalcBuddy Editorial Team

This page is maintained as an educational calculator reference.

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Formula Source: Standard Mathematical References

by Various

ðŸ”„Last reviewed: May 2026

âœ“Formula checks are based on standard references and internal QA review.