NNT Calculator

Free calculate Number Needed to Treat (NNT). This is an educational tool only - always consult a healthcare provider.

Event Rates

Results

Enter event rates to calculate NNT

About NNT

  • • NNT = 1 / (Control Event Rate - Treatment Event Rate)
  • • Lower NNT: More effective treatment
  • • NNT = 1: Every patient benefits
  • • NNT = 10: 10 patients treated to help 1
  • • Used in evidence-based medicine