NNT Calculator — Number Needed to Treat

Input Parameters

Events in Treatment Group

Total in Treatment Group

Events in Control Group

Total in Control Group

Confidence Level

NNT

Risk in Control Group

Risk in Treatment Group

Absolute Risk Reduction (ARR)

Relative Risk Reduction (RRR)

NNT

Reference: Altman, D.G. (1998). "Confidence intervals for the number needed to treat." BMJ, 317(7168), 1309-1312.

Disclaimer: This tool is for educational and research planning purposes.