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See your ideal weight using all four major formulas — Devine, Miller, Robinson, and Hamwi — side by side, with an average you can actually use.
Ideal Body Weight Calculator
Sex
Ideal Body Weight Results
Formula Result
Devine 70 kg
Miller 69 kg
Robinson 69 kg
Hamwi 72 kg
Average 70 kg
Results are estimates based on height and sex only. Body composition, muscle mass, and individual variation are not accounted for.
Ideal Body Weight (IBW) is a clinical estimate of a healthy weight range for a given height and sex. It was originally developed for medical dosing and clinical purposes, not aesthetics. The result gives you a reference point — not a target — for understanding where your weight sits relative to your height.
How to Use This Calculator
1
Select your sex (male or female) — each formula uses sex-specific constants.
2
Enter your height in centimeters.
3
The calculator instantly shows results for all four formulas and their average.
4
Use the average as your reference point — individual formulas can vary by 5–10 kg.
How Ideal Body Weight Formulas Work
All four formulas share the same structure: a base weight (at 5 feet / 152 cm) plus an increment for each additional inch of height. They were developed in clinical settings between 1964 and 1983, originally to estimate proper drug dosages.
Because they only account for height and sex — not muscle mass, bone density, or body composition — they are best used as a rough reference rather than a precise target.
The Four Formulas
Devine (1974): Men = 50 + 2.3 × (height_in − 60) | Women = 45.5 + 2.3 × (height_in − 60)
Miller (1983): Men = 56.2 + 1.41 × (height_in − 60) | Women = 53.1 + 1.36 × (height_in − 60)
Robinson (1983): Men = 52 + 1.9 × (height_in − 60) | Women = 49 + 1.7 × (height_in − 60)
Hamwi (1964): Men = 48 + 2.7 × (height_in − 60) | Women = 45.5 + 2.2 × (height_in − 60)
Why Formulas Differ
Each formula was built from a different patient population at a different time. Devine was originally used for medication dosing in obese patients. Miller and Robinson were designed to represent typical healthy adults. Hamwi is the oldest and uses the most aggressive increment per inch.
The spread between them gives you a realistic range — typically 3–8 kg — that represents the uncertainty in any height-only estimate.
IBW vs BMI vs Body Fat
IBW gives you a single number based on height and sex. BMI also uses weight in the calculation, placing you on a spectrum from underweight to obese. Body fat percentage is the most accurate measure of body composition because it distinguishes muscle from fat.
For most people, IBW is a useful starting point — but body fat percentage tells a more complete story, especially for athletes and strength-trained individuals.
Ideal Body Weight for Personal Trainers
As a personal trainer, IBW calculators are useful for initial client assessments. They give you a quick, defensible reference point when discussing weight goals — and the multi-formula view helps you explain why a single number is never the whole picture.
With Gymkee, you can record and track client assessment data over time, including weight, body measurements, and fitness test results, giving you a complete picture of progress beyond any single metric.
Frequently Asked Questions
Which ideal body weight formula is most accurate?
No single formula is universally most accurate — they were each developed from different populations for clinical purposes. The average of the four formulas gives a more robust estimate than any single one. For practical use, treat the result as a range, not a precise target.
Is ideal body weight the same as a healthy weight?
Not exactly. IBW is a clinical estimate originally designed for drug dosing, not for defining health. A healthy weight depends on body composition, muscle mass, and overall metabolic health — factors that height-only formulas do not capture.
What if I weigh more than my IBW but have high muscle mass?
IBW formulas do not account for muscle mass. A strength-trained person or athlete will often weigh more than their IBW result while being in excellent health. In these cases, body fat percentage is a far better indicator of body composition.
Do these formulas work for all heights?
The formulas were designed for adults above 5 feet (152 cm). For heights below 152 cm, the results can be less reliable because the formulas extrapolate outside their original validation range.
Can I use IBW to set a weight loss goal?
IBW gives you a reference point, not a prescription. For weight loss goals, it's better to focus on a sustainable rate of change, body composition improvements, and energy levels rather than hitting a specific IBW number.
Why do the four formulas give different results?
Each formula was built from a different patient population, in a different era, for a different clinical purpose. The differences reflect genuine uncertainty in what "ideal" means — which is why comparing all four and using the average is more informative than picking one.
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