Educational framing only — not medical advice, not a treatment recommendation, and not a substitute for reading the underlying trial.

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Formula

ARD = EER − CER · NNT = ⌈100 ÷ ARD⌉

Trial reference

Event rates

%
%

Result wording

3 months
Copy only — does not change ARD or NNT

Enter control and experimental event rates — or pick a trial preset.

Worked example — CER 8.3% · EER 50% → ARD 41.7 pp · NNT 3 (Cormio 2011, 1 month)

Educational only — not medical advice. Disclaimer.

How to use this

  • CER — % of people with the event in the control / placebo arm.
  • EER — % with the event in the experimental arm.
  • ARD — EER minus CER, in percentage points.
  • NNT — ceiling of 1 ÷ ARD (as a proportion). Always pair with a time horizon.
  • Presets — published dichotomous figures from our guides. Small-n caveats stay attached.

What this does not do

Continuous outcomes (mean IIEF change, hair count per cm², kg lost) do not get an NNT. Relative risk or odds ratio without baseline rates are not enough. Observational studies are out of scope. If the experimental arm does worse, use NNH framing — this tool flags that case instead of inventing a benefit NNT.

From this tool

Dose registry