Weight & Body tool
Ideal Body Weight Calculator
Find a healthy weight for your height from the WHO BMI range, and compare the Devine, Robinson, Miller and Hamwi ideal-weight formulas. Free, nothing stored.
Nothing you enter leaves your device.
Inputs
Results
Enter values to see your results.
Simple steps
How it works
- 01
Choose metric or imperial units and your sex.
- 02
Enter your height.
- 03
Select Calculate to see the healthy weight range and four ideal-weight formulas.
Good to know
Frequently asked questions
Which result should I follow?
Start with the healthy weight range: the weights that give a BMI from 18.5 to 24.9, the range the World Health Organization uses for adults. The four formulas give single figures and are best read as a rough guide.
Where do the four formulas come from?
Devine (1974), Robinson (1983), Miller (1983) and Hamwi (1964) were written for medicine dosing. They add a fixed amount of weight per inch of height above 5 feet.
Why do I only see the BMI range?
The four formulas start at 152 cm (5 ft). For shorter heights only the BMI-based range is shown.
Does the ideal weight depend on my build?
Yes. Muscle, frame size and age change what is healthy for you, and the formulas do not include them. A doctor can tell you what suits you.
Is this suitable for children?
No. Children and teenagers need age- and sex-specific growth charts.
Can I use feet and inches?
Enter your height in inches when imperial units are chosen: 5 ft 7 in is 67 inches.
Is anything I enter stored or sent?
No. The calculation runs in your browser. Nothing you type is saved or sent to a server.
How it is calculated
The healthy weight range is 18.5 × height² to 24.9 × height² (height in metres), the WHO adult BMI range. The formulas add weight per inch above 5 ft: Devine men 50 kg + 2.3 kg, women 45.5 kg + 2.3 kg; Robinson men 52 + 1.9, women 49 + 1.7; Miller men 56.2 + 1.41, women 53.1 + 1.36; Hamwi men 48 + 2.7, women 45.5 + 2.2.
Sources
- World Health Organization. Obesity and overweight (fact sheet)
- Devine BJ. Gentamicin therapy. Drug Intell Clin Pharm 1974;8:650–5
- Robinson JD et al. Determination of ideal body weight for drug dosage calculations. Am J Hosp Pharm 1983;40:1016–9
- Miller DR et al. Determining ideal body weight. Am J Hosp Pharm 1983;40:1622
- Hamwi GJ. Therapy: changing dietary concepts. In: Diabetes Mellitus: Diagnosis and Treatment, 1964
Last reviewed: October 14, 2026