Ideal Weight Calculator
Find your ideal body weight range using Devine, Robinson, Miller, and Hamwi formulas. Supports metric and imperial units.
Ideal Weight Range
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Average Ideal
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Healthy BMI Range (same height)
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By formula
These are statistical estimates. A healthy weight varies by body composition, bone density, and individual factors.
What is Ideal Weight Calculator?
The Ideal Weight Calculator estimates your ideal body weight range based on your height and sex using four established medical formulas: Devine (1974), Robinson (1983), Miller (1983), and Hamwi (1964). These formulas were originally developed for clinical use — primarily for drug dosing and nutritional assessment. The range across all four formulas gives a practical target zone rather than a single arbitrary number, since no one formula applies equally to all body types.
How to use
- 1 Select your biological sex.
- 2 Choose Metric or Imperial units.
- 3 Enter your height.
- 4 Optionally enter your current weight to see how far you are from the average ideal.
- 5 Review the ideal weight range and the individual estimates from each formula.
Formula
Example calculation
A 175 cm (68.9 in) male: Devine = 68.5 kg, Robinson = 69.9 kg, Miller = 73.9 kg, Hamwi = 72.1 kg. Ideal range: 68.5–73.9 kg. Average: 71.1 kg. In imperial: 151–163 lbs, average 157 lbs.
Frequently asked questions
Which ideal weight formula is most accurate?
No single formula is definitively the most accurate for every individual. The Devine formula is the oldest and most referenced in clinical settings (particularly for drug dosing). Robinson and Miller were developed as alternatives to address perceived shortcomings in Devine. Hamwi is commonly used in dietetic practice. Using the range across all four gives a more realistic target zone.
Should I aim for the middle of the ideal weight range?
The midpoint is a reasonable target, but ideal weight is highly individual. Factors like bone density, muscle mass, age, and body frame all affect what a healthy weight looks like for you. A broad-shouldered, heavily muscled person may be healthiest at the top or even above the range.
How is ideal weight different from healthy BMI weight?
A healthy BMI (18.5–24.9) gives a weight range derived from a statistical relationship between height and health outcomes. Ideal weight formulas use a fixed formula based on height, typically giving a narrower range. The two approaches overlap but are not identical.
What if my current weight is outside the ideal range?
Being outside the statistical range does not necessarily mean you are unhealthy. A muscular athlete may well exceed the ideal weight range while having excellent body composition. Consult a healthcare provider for a personalised assessment that accounts for body composition, metabolic markers, and lifestyle.
Do these formulas apply to everyone?
These formulas were developed primarily on adult Caucasian populations and may not be appropriate for children, adolescents, elderly individuals, pregnant women, or people with certain medical conditions. Some research suggests adjustments may be needed for Asian populations.