How to Calculate Ideal Body Weight
What is Ideal Body Weight?
Ideal body weight estimates healthy weight ranges for height. It's used in clinical assessment and nutrition planning.
Step-by-Step Guide
- 1Devine formula (males): 50 kg + 2.3 kg per inch over 60 inches
- 2Devine formula (females): 45.5 kg + 2.3 kg per inch over 60 inches
- 3Or BMI method: calculate weight for BMI 22-24
Worked Examples
Input
Female, 168 cm (66 inches) tall
Result
IBW ≈ 45.5 + 2.3×6 ≈ 59.3 kg (130 lbs)
Healthy weight range estimate
Common Mistakes to Avoid
- ✕Applying IBW universally without considering body composition
- ✕Expecting patients to reach IBW as sole goal
Frequently Asked Questions
Is IBW just for normal BMI?
It's more complex in muscular individuals (high BMI with low body fat) or very obese (goal weight different).
How should IBW be used clinically?
Guide, not target; individual factors (muscle mass, genetics) mean exact match isn't needed.
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