Risk Ratio Calculator
Calculate risk ratio, odds ratio, risk difference, and group risks from a 2x2 table.
Help notes
Enter a standard 2x2 table: exposed cases (a), exposed non-cases (b), unexposed cases (c), and unexposed non-cases (d). Calculations run in your browser.
Input
Fill the 2x2 table counts.
Results
Risk Ratio
Not available
Odds Ratio
Not available
Risk Difference
Not available
Risk in Exposed
Not available
Risk in Unexposed
Not available
Interpretation
A risk ratio above 1 suggests higher risk among the exposed group; below 1 suggests lower risk. Risk difference is the absolute difference between the exposed and unexposed risks. Check study design and uncertainty before drawing causal conclusions.