Statistics

Relative Risk Calculator

Find relative risk between an exposed and control group.

Calculated Output

Relative risk 3

Absolute risk reduction 0.2

Formula: RR = [a/(a+b)] ÷ [c/(c+d)]

Step-by-Step Breakdown

1. Values used:

2. Exposed with outcome = 30

3. Exposed without outcome = 70

4. Control with outcome = 10

5. Control without outcome = 90

7. Relative risk = 3

8. Absolute risk reduction = 0.2

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The math behind it

RR = risk in exposed ÷ risk in control. RR > 1 means higher risk with exposure.

30% vs 10% → RR = 3 (triple the risk).

RR vs odds ratio?

RR uses probabilities; the odds ratio uses odds, and they differ for common outcomes.