Calculator
Outcome +Outcome -
Exposed / Group A
Unexposed / Group B
Relative Risk Calculator
Calculate relative risk from event counts in exposed and unexposed groups.
About this method
Relative risk compares event probability between two groups. RR > 1 indicates higher risk in the exposed group, while RR < 1 indicates reduced risk.
Frequently Asked Questions
When should I use relative risk?
Use relative risk in cohort studies, randomized trials, and designs where event risk can be directly estimated.
What does RR = 0.70 mean?
It means the exposed or treatment group has 30% lower risk compared with the reference group.
Can I use RR for case-control studies?
Usually no. Case-control studies generally report odds ratios.