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Free statistical calculators

Odds ratio calculator

Subjects with positive (bad) outcome
:  a
:  c
Subjects with negative (good) outcome
:  b
:  d

For details, see the MedCalc manual: Odds ratio(2x2 table).

See also Relative risk & Odds ratio computational notes.

How to cite this page

  • MedCalc Software Ltd. Odds ratio calculator. https://www.medcalc.org/calc/odds_ratio.php (Version 23.2.1; accessed April 25, 2025)
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