Enter your height, biological sex, and preferred units to calculate your ideal body weight according to standard clinical formulas and the WHO healthy BMI range.
How to use this calculator
Choose your unit system (metric or imperial) and biological sex.
Enter your height.
Read your recommended ideal weight and compare the four clinical formulas (Devine, Hamwi, Miller, Robinson).
Review the WHO healthy weight range (BMI 18.5–24.9) for your height.
Formula & method
Devine, Hamwi, Miller, Robinson & WHO BMI Equations
Devine Male = 50 + 2.3×(inches > 60) · Devine Female = 45.5 + 2.3×(inches > 60) · WHO Min = 18.5×height(m)² · WHO Max = 24.9×height(m)²
Inches over 60 = height in inches minus 60. Values in kg, converted to lb when imperial units are selected.
Example
Male 175cm (5 ft 9 in, 69 inches) → Devine: 70.7 kg (155.9 lb), Hamwi: 72.3 kg, Miller: 68.7 kg, Robinson: 69.1 kg. WHO Range: 56.7–76.3 kg.
Key insights
The Devine formula is the most widely used medical reference for dosing medications based on ideal body weight.
Ideal weight formulas provide a reference target for average body frame sizes and do not account for heavy athletic muscle mass.
The WHO BMI range (18.5–24.9) provides a broader, population-validated healthy weight band.
For individuals under 5 feet (152 cm), formulas scale baseline values linearly per inch below 5 ft.
Maintaining a body weight within the WHO range correlates with a lower incidence of cardiovascular disease and metabolic disorders.
How to interpret your result
Clinical Formula Differences
Devine, Hamwi, Miller, and Robinson formulas yield slightly different results because they were developed for distinct patient cohorts.
Ideal Weight vs. Healthy Weight Range
Single ideal weight numbers are guidelines. The WHO healthy BMI range (18.5–24.9) represents a flexible target band of 15–20 kg.
Body Composition Impact
Muscular athletes may exceed ideal weight formulas while maintaining low body fat percentage; evaluate body fat alongside weight.
Frequently asked questions
Which ideal weight formula is the most accurate?
The Devine formula is the standard clinical benchmark used in medicine, but comparing all four formulas gives a balanced perspective.
Why does gender change the ideal weight?
On average, biological men have higher bone density and muscle mass per unit of height than women, resulting in higher ideal weight targets.
What if my weight is above the calculated ideal weight?
Ideal weight is a reference tool, not a strict rule. If your body fat percentage and metabolic health markers are healthy, being above the ideal weight is normal.
Related calculators
BMI Calculator — Compute your Body Mass Index and see where you stand, in metric or imperial units.
Body Fat Calculator — Estimate your body fat percentage, fat mass, and lean mass using the US Navy method.
Calorie Calculator — Estimate your daily calorie needs (BMR & TDEE) for maintenance, loss or gain.