Free Ideal Body Weight Calculator
Calculate ideal body weight using 4 clinical formulas: Devine, Robinson, Miller, and Hamwi. Includes adjusted body weight calculation for patients with obesity. A trusted tool for dietitians and healthcare professionals.
Male
Female
Ideal Body Weight Results
Calculated using 4 clinical formulas
Adjusted Body Weight (for Obesity)
Your actual weight exceeds IBW by more than 30%. Use Adjusted Body Weight for nutritional calculations.
Clinical Documentation Output
Patient Data: Height: -- Actual Weight: -- Ideal Body Weight: - Devine: -- kg - Robinson: -- kg - Miller: -- kg - Hamwi: -- kg Adjusted Body Weight: N/A
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How to Use This IBW Calculator
This ideal body weight calculator uses four clinically validated formulas to estimate a healthy weight based on height and biological sex. Simply:
- Select your unit system (Imperial or Metric)
- Choose biological sex (formulas differ for males and females)
- Enter your height
- Optionally enter actual weight to calculate Adjusted Body Weight
IBW Formulas Explained
- Devine (1974): Most commonly used in clinical practice.
Males: 50 + 2.3 × (height in inches - 60) - Robinson (1983): More generous for taller individuals.
Males: 52 + 1.9 × (height in inches - 60) - Miller (1983): Higher baseline for females.
Males: 56.2 + 1.41 × (height in inches - 60) - Hamwi (1964): One of the earliest formulas.
Males: 48 + 2.7 × (height in inches - 60)
Frequently Asked Questions
What is Ideal Body Weight (IBW)?
Ideal Body Weight is a clinical estimation of what a person should weigh based on their height and biological sex. It's commonly used in healthcare settings for medication dosing, nutritional assessments, and setting weight goals.
Which IBW formula should I use?
The Devine formula is most commonly used in clinical practice and is the standard for medication dosing. However, all formulas provide reasonable estimates. Consider using the average of multiple formulas for a more balanced target.
What is Adjusted Body Weight?
Adjusted Body Weight (AdjBW) is used when actual weight exceeds IBW by 30% or more. The formula is: AdjBW = IBW + 0.4 × (Actual Weight - IBW). This accounts for the metabolically active portion of excess weight.
When should I use Adjusted Body Weight?
Use AdjBW for calculating protein and calorie needs in patients with obesity. Using actual weight would overestimate needs, while IBW alone would underestimate them. The 0.4 adjustment factor accounts for about 25% of adipose tissue being metabolically active.
Are these formulas accurate for everyone?
IBW formulas were developed primarily from Caucasian populations and may not be equally applicable to all ethnic groups. They also don't account for muscle mass or frame size. Use clinical judgment and consider other assessment methods alongside IBW.