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Calculator: Peak expiratory flow prediction in males (5 to <18 years)

Calculator: Peak expiratory flow prediction in males (5 to <18 years)

Race/ethnicity White

Black or African American

Mexican American


Important: Inputs must be complete to perform calculation.

Predicted peak flow  
80% of predicted peak flow  
50% of predicted peak flow  



Peak flow zone interpretation

% predicted PEFPeak flow zone
50 to 80%


  • This calculator uses the equations from Hankinson 1999 (NHANES III) where available and equations from Knudson 1983 where there are deficits in the data (patients who are not 8 to 17 years of age and patients age 8 to 17 years who are not White, Black or African American, or of Mexican American ethnicity).
  • PEF: peak expiratory flow.

Calculation details and variables
  • In the following cases the Hankinson equation is used: PEF predicted[L/min] = 60 * (b0 + (b1 * Age[yr]) + (b2 * Age2[yr]) + (b3 * Height[cm]2)) is used with the specified coefficients:
    • For a White male 8 to 17.99 years old: b0 = -0.5962; b1 = -0.12357; b2 =  0.013135; b3 = 0.00024962.
    • For a Black or African American male, 8 to 17.99 years old: b0 = -0.2684; b1 = -0.28016; b2 = 0.018202; b3 = 0.00027333.
    • For a Mexican American male, 8 to 17.99 years old: b0 = -0.9537; b1 = -0.19602; b2 = 0.014497; b3 = 0.00030243.
    • In all males under age 8 and in males of other race/ethnicities: PEF predicted[L/min] = ((Height[cm] - 100) * 5) + 100

Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

Information on this page may not appear correctly if printed.

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All information contained in and produced by the EBMcalc system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.

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