Ideal Body Weight
Info
Height
unit cm inches
Weight
unit Kgs lbs
R e s u l t s
---
 
Ideal Body Weight
 
Adjusted body weight
 
The patient is
 
Show Results
Info
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 × (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:

  1. Lemmens HJ, Brodsky JB, Bernstein DP. Estimating Ideal Body Weight - A New Formula. Obesity Surgery . 2005;15(7):1082-3.
  2. Robinson JD, Lupkiewicz SM, Palenik L, et al. Determination of ideal body weight for drug dosage calculations. Am J Hosp Pharm . 1983;40:1016-9.