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    Ideal Body Weight and Adjusted Body Weight

    Calculates ideal body weight (Devine formula) and adjusted body weight.
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    INSTRUCTIONS

    To calculate tidal volume by ideal body weight, use the ETT Depth and Tidal Volume Calculator.

    When to Use
    Pearls/Pitfalls
    Why Use

    This formula is only an approximation, and is generally only applicable for people ≥60 inches (5 feet) tall. For patients under 5 feet, one commonly-used modification is to subtract 2-5 lbs for each inch below 60 inches (written communication with leading expert Dr. Manjunath Pai, 2018).

    • There are multiple ideal body weight formulas that have been developed; they all have different caveats and problems. Your hospital may use a slightly different formula based on its local population.
    • Ideal body weight is the standard weight measurement in many clinical calculations, such as tidal volume.
    While many medications are weight-based, often they are recommended to be dosed on ideal body weight.
    Female
    Male
    in
    lbs

    Result:

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    Next Steps
    Evidence
    Creator Insights

    Advice

    Confirm medication dosing with pharmacy: some medication dosing uses ideal body weight while others use actual body weight.

    Formula

    Ideal Body Weight (Devine formula):

    • Ideal body weight (IBW) (men) = 50 kg + 2.3 kg x (height, in - 60)
    • Ideal body weight (IBW) (women) = 45.5 kg + 2.3 kg x  (height, in - 60)
    • Note: this formula is only an approximation, and is generally only applicable for people 60 inches (5 foot) tall or greater. For patients under 5 feet, one commonly-used modification is to subtract 2-5 lbs for each inch below 60 inches (written communication with leading expert Dr. Manjunath Pai, 2018).
    Adjusted Body Weight (ABW), for use in obese patients (where actual body weight > IBW):
    • ABW = IBW + 0.4 x (actual body weight - IBW)
    Dr. Manjunath Pai

    About the Creator

    Leading expert on the Ideal Body Weight calculator:

    Manjunath Pai, PharmD, is a professor in the Department of Pharmacy Practice at the Albany College of Pharmacy. He is the author of “The Origin of the 'Ideal' Body Weight Equations”, a comprehensive literature review on the creation of and iterations to the ideal body weight formula over time. Dr. Pai conducts research on the optimization of antimicrobial drug dosing, most recently in the obese population.

    To view Dr. Manjunath Pai's publications, visit PubMed