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Relative Risk & Odds Ratio Calculator

Calculate epidemiological Relative Risk, Odds Ratio, and Risk Reduction.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Standard 2x2 contingency table for medical biostatistics, clinical trials, and epidemiological risk analysis.

How to use it (step by step)

  1. 1Fill in the boxes: “Exposed with Outcome (a)”, “Exposed without Outcome (b)”, “Unexposed with Outcome (c)”, “Unexposed without Outcome (d)”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Fraction / ratio
A fraction is a part of a whole (3/4 = three of four parts). A ratio compares two amounts (2:1 = twice as much).

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