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NNT Calculator — Free Online Tool
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NNT Calculator

Calculate Number Needed to Treat (NNT) and Absolute Risk Reduction

Evidence-Based Medicine: The Number Needed to Treat (NNT) represents the average number of patients who need to be treated to prevent one additional bad outcome. It is calculated as $1 / \text{Absolute Risk Reduction (ARR)}$. Enter clinical trial event rates below.
Clinical Trial Parameters Input

Calculation Results

⚠️ Not medical advice. For evidence-based medicine, biostatistics, and clinical research reference only. Clinical trial data interpretation and therapeutic decision-making must be supervised strictly by qualified medical professionals.

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