Ideal Body Weight
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Height
unit cm inches
Weight
unit Kgs lbs
R e s u l t s
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Ideal Body Weight
 
Adjusted body weight
 
The patient is
 
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Ideal Body Weight

Ideal body weight (IBW) has historically had several recommended methods of calculation; however, we are now in the era of Body Mass Index (BMI) and a recommended formula based upon this has been proposed.

 

IBW (kgs) = 22 x (height in meters) 2

 

In obese patients, where actual body weight is >30% over calculated IBW, an Adjusted Body Weight (ABW) is often recommended for drug dosing.

 

ABW=IBW+0.4(actual weight-IBW)

 

Historical formulas for IBW have included:

Devine Formula:

Males: 50 kg + 2.3 kg for each inch over 5 ft

Females: 45.5 kg + 2.3 kg for each inch over 5 ft

 

Robinson Formula:

Males: 52 kgs + 1.9 kg for each inch over 5 ft

Females: 49 kgs + 1.7 kgs for each inch over 5 ft

 

Miller Formula:

Males: 56.2 kgs + 1.41 kgs for each inch over 5 ft

Women: 53.1 kgs + 1.36 kgs for each inch over 5 ft

 

References:

Lemmens HJ, et al. Estimating Ideal Body Weight - A New Formula. Obesity Surgery. 2005 August;15(7):1082-3.

Robinson JD, et al. Determination of ideal body weight for drug dosage calculations. Am J Hosp Pharm. 1983;40:1016-9.