Ideal Body Weight and Adjusted Body Weight

Ideal Body Weight & Adjusted Body Weight (Devine)
kg
Calculates ideal body weight (Devine formula) and adjusted body weight.

Why Use

While many medications are weight-based, often they are recommended to be dosed on ideal body weight.

When to 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).

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)

Pearls / Pitfalls

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 .

Advice

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

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