NNT Calculator

Number needed to treat.

NNT 10

Step-by-step with your numbers:

1. Values used:

2. Control event rate = 30 %

3. Experimental event rate = 20 %

4. NNT = Control event rate - Experimental event rate = 30 - 20 = 10

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NNT = 1 ÷ absolute risk reduction. How many to treat for one benefit.

FAQ

Ideal NNT?

Lower is better — ideally close to 1.