Relative Risk Calculator
Result
Calculated result
0.25
Based on the values entered.
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Relative Risk Calculator — free online calculator.
Formula
RR = (a/n₁) / (c/n₂) · ARR = |Risk₁ − Risk₂| · NNT = 1/ARR
- Relative Risk Calculator calculates its result from Risk1, Risk2, Arr. It uses the formula RR = (a/n₁) / (c/n₂) · ARR = |Risk₁ − Risk₂| · NNT = 1/ARR. Change any input to recalculate the result instantly.
- The main inputs are Risk1, Risk2, Arr. Enter them in the units and format shown in the calculator.
- Keep comparable quantities in compatible units whenever the formula combines or compares them.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Relative Risk
Inputs
- Risk1: 2
- Risk2: 3
- Arr: 4
Using Risk1 = 2, Risk2 = 3, Arr = 4, the calculated result is 0.25.
Sample result: Calculating…
Frequently asked questions
What does the Relative Risk calculate?
Relative Risk Calculator — free online calculator.
Which values should I enter?
Enter Risk1, Risk2, Arr using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: RR = (a/n₁) / (c/n₂) · ARR = |Risk₁ − Risk₂| · NNT = 1/ARR.
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.