Ideal Body Weight Calculator (Multiple Formulas
Three main ideal body weight formulas exist: Hamwi (1964), Devine (1974), and Robinson (1983).
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📐 Formula
💡 Practical Example
175 cm male (6.9 in over 5 ft), medium frame: Hamwi = 48.1 + 6×6.9 × 0.454 = 78.0 kg | Devine = 50 + 2.3×6.9 = 65.9 kg | Robinson = 52 + 1.9×6.9 = 65.1 kg.
📖 About Ideal Body Weight Calculator (Multiple Formulas
Three main ideal body weight formulas exist: Hamwi (1964), Devine (1974), and Robinson (1983). Devine is most used in clinical medicine for drug dosing. None perfectly account for muscle mass.
To use the Ideal Body Weight Calculator (Multiple Formulas), enter your Height, Sex, Body Frame Size. The calculator instantly computes Ideal Weight (Hamwi Formula), Ideal Weight (Devine Formula) and more. Results update in real time as you change any input — no submit button needed.
How to Use This Calculator
Enter your Height (e.g. 175 in cm), Sex — select from Male, Female, and Body Frame Size — select from Small Frame (-10%), Medium Frame (Standard), Large Frame (+10%). Results update instantly — no submit button needed. Use metric or imperial units as labeled. For the most accurate result, measure height and weight in the morning without shoes.
The Formula
Hamwi Male: 106 lb + 6 lb/in over 5 ft | Hamwi Female: 100 lb + 5 lb/in
Devine Male: 50 kg + 2.3 kg/in | Devine Female: 45.5 kg + 2.3 kg/in
Robinson Male: 52 kg + 1.9 kg/in | Robinson Female: 49 kg + 1.7 kg/in
Worked Example
175 cm male (6.9 in over 5 ft), medium frame: Hamwi = 48.1 + 6×6.9 × 0.454 = 78.0 kg | Devine = 50 + 2.3×6.9 = 65.9 kg | Robinson = 52 + 1.9×6.9 = 65.1 kg.
Understanding Your Result
Ideal body weight (IBW) formulas (Hamwi, Robinson, Miller, Devine) were originally developed for clinical drug dosing, not aesthetic goals. They produce different results — Hamwi tends to give the highest value; Devine (used in pharmacology) is the most cited. IBW should be interpreted alongside BMI, body composition, age, and individual health status. For older adults (65+), slightly higher weight (BMI 23–28) is associated with lower all-cause mortality — the so-called "obesity paradox."
💡 Expert Health Guidance & Clinical Context
- This calculator uses clinically validated formulas and population reference data published by the WHO and NIH. Results are screening estimates, not medical diagnoses.
- Consult a licensed healthcare provider before making any changes to diet, medication, or exercise based on these results — individual variation is significant.
- Genetics, chronic conditions, and concurrent medications can dramatically affect what a "normal" result means for a specific individual.
- Track your results over time: a single data point is less meaningful than a trend measured consistently across multiple weeks or months.
- The CDC recommends adults receive routine health screenings at least annually. Use these calculations to prepare informed questions for your physician.
- Body composition, lifestyle factors, and stress levels all interact with the metrics shown here. No single number captures your full health picture.
- For pediatric or geriatric populations, reference ranges may differ significantly from the adult standards used in general calculators.
- Always cross-reference results with laboratory tests, clinical examinations, and professional medical evaluation before acting on any finding.
Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.