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Ideal Body Weight (IBW) Calculator
Ideal Body Weight (IBW) formulas were originally developed by clinical pharmacologists to standardize drug dosages, kidney clearance rates, and mechanical ventilation parameters. Today, comparing results across the Devine, Robinson, Miller, and Hamwi equations alongside WHO BMI benchmarks provides a balanced perspective on healthy body weight targets.
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How to Use This Tool Step-by-Step
- Select Gender and input Height.
- Review your Ideal Body Weight calculated across all 4 recognized clinical formulas.
- Compare results against the World Health Organization (WHO) healthy BMI weight range.
📐 Clinical Ideal Body Weight Equations
• Devine Formula (1974): Men: 50.0 kg + 2.3 kg per inch over 5 feet Women: 45.5 kg + 2.3 kg per inch over 5 feet • Robinson Formula (1983): Men: 52.0 kg + 1.9 kg per inch over 5 feet Women: 49.0 kg + 1.7 kg per inch over 5 feet • Miller Formula (1983): Men: 56.2 kg + 1.41 kg per inch over 5 feet Women: 53.1 kg + 1.36 kg per inch over 5 feet
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Comparison Example for 5 ft 10 in (178 cm) Male
For a man 5 feet 10 inches tall (10 inches over 5 feet):
1. Devine IBW = 50.0 + (2.3 × 10) = 73.0 kg (160.9 lbs)
2. Robinson IBW = 52.0 + (1.9 × 10) = 71.0 kg (156.5 lbs)
3. Miller IBW = 56.2 + (1.41 × 10) = 70.3 kg (155.0 lbs)
4. WHO Healthy Range (BMI 18.5 – 24.9) = 58.6 kg to 78.9 kg.
📊 Reference Benchmarks & Classification Data
| Formula Name | Male Baseline (at 5 ft) | Female Baseline (at 5 ft) | Clinical Application |
|---|---|---|---|
| Devine Formula | 50.0 kg | 45.5 kg | Pharmacology & ICU medication dosages |
| Robinson Formula | 52.0 kg | 49.0 kg | General health assessment update |
| Miller Formula | 56.2 kg | 53.1 kg | Adjusted for modern stature |
| WHO BMI Range | BMI 18.5 | BMI 24.9 | Global epidemiological health standard |
❓ Frequently Asked Questions (FAQ)
Why is there a difference between the different ideal weight formulas?
Different medical researchers evaluated different patient populations and body frame types. Using an average or viewing the range provides a more realistic target than a single fixed number.