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Centor / McIsaac Score Calculator

Probability of strep pharyngitis.

Compute the McIsaac modification of the Centor score for strep pharyngitis. Adds one point for age 3-14, removes one for age ≥ 45, in addition to the four classic clinical items.

Priya Venkatesan By Priya Venkatesan
Reviewed by Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Total = exudate + nodes + fever + cough_absent + age_modifier (+1 / 0 / −1).

In depth

Compute the McIsaac modification of the Centor score for strep pharyngitis. Adds one point for age 3-14, removes one for age ≥ 45, in addition to the four classic clinical items.