Ideal Weight Calculator — Find Your Healthy Weight Range
Use this free ideal weight calculator to find your healthy weight range based on your height and gender. This calculator uses four established medical formulas — Devine, Robinson, Miller and Hamwi — and shows the average alongside your healthy BMI weight range so you get a complete picture rather than a single number.
Ideal Weight Calculator
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How to Use the Ideal Weight Calculator
Select your gender, choose metric or imperial, enter your height and click Calculate. Your ideal weight is shown as an average across four different formulas along with your healthy BMI weight range.
How Is Ideal Weight Calculated?
This calculator uses four established medical formulas — each slightly different in how they weight height against gender:
Devine Formula — the most widely used formula, originally developed for medication dosing in clinical settings.
Robinson Formula — a 1983 revision of the Devine formula, slightly adjusted for different height ranges.
Miller Formula — another revision that tends to produce slightly higher results, particularly for taller individuals.
Hamwi Formula — developed for clinical use, gives slightly higher estimates than Devine especially for men.
The average of all four gives a more balanced estimate than relying on any single formula.
Ideal Weight vs Healthy Weight Range
Ideal weight formulas give a single target number. The healthy BMI weight range (BMI 18.5–24.9) gives a broader range that most health professionals consider more realistic and useful. Both are shown in the results above.
Neither should be treated as a rigid target — body composition, muscle mass, bone density and overall fitness matter far more than a number on a scale.
Limitations of Ideal Weight Calculators
Ideal weight formulas were originally developed for medical dosing calculations — not as fitness or aesthetic targets. They don’t account for muscle mass, which means a fit muscular person may sit above the ideal weight range while being extremely healthy. Use these numbers as a general reference point only.
FAQs
How is ideal weight calculated?
This calculator uses four established formulas — Devine, Robinson, Miller and Hamwi — and shows the average. Each formula estimates ideal weight based on height and gender.
Is there one perfect ideal weight?
No — ideal weight formulas provide general guidelines only. They don’t account for muscle mass, bone density, age or body composition. A heavily muscled person may exceed the ideal weight range while being very healthy.
What is the difference between ideal weight and healthy weight?
Ideal weight formulas estimate a single target weight. Healthy weight refers to a BMI range of 18.5-24.9 which gives a broader range. This calculator shows both.
Should I aim for the exact ideal weight shown?
Treat it as a reference point rather than a target. Focus on overall health markers — energy levels, fitness, blood pressure and body composition — rather than hitting a specific number.