Ideal Weight Calculator
See your target weight from four trusted formulas at once, with a healthy BMI-based range as a fifth reference point.
Awaiting Data
Enter your details and tap Calculate to see your results appear here.
Your result appears here.
What Ideal Weight Means
Ideal body weight is a target range tied mostly to your height and sex. Clinicians built these formulas decades ago to guide medication dosing and healthy goals.
No single number fits everyone, so this tool shows four estimates side by side. Treat the spread as a healthy zone rather than one exact figure.
Your frame, muscle, and age all shift the real target, which is why a range beats a single point.
How to Use This Calculator
- Choose metric or US units.
- Select your sex.
- Enter your height.
- Tap Calculate to compare all five reference weights.
The Formula Used
Hamwi, Robinson, and Miller follow the same pattern with different base weights and per-inch steps.
- base weight
- The starting weight at a height of five feet.
- per inch
- Weight added for every inch above five feet.
The BMI range uses 18.5 to 24.9 multiplied by your height in metres squared, giving a healthy band that scales naturally with height.
Understanding Your Results
Tips for Reaching a Healthy Weight
- Aim for the middle of the range, not the lowest number.
- Change weight slowly, around half a kilogram a week.
- Build strength so more of your weight is muscle.
- Judge progress by how you feel and move, not the scale alone.
Frequently Asked Questions
Each was built from a different population and era. The spread between them is your healthy target zone.
No. Height-based formulas ignore body composition, so very muscular people may sit above the range while still being lean.
Treat the cluster as a band and aim near its centre, adjusting for your frame and activity.
Scientific References
- Devine, B. J. (1974). Gentamicin therapy. Drug Intelligence & Clinical Pharmacy, 8, 650–655.
- Robinson, J. D., et al. (1983). Determination of ideal body weight for drug dosage calculations. American Journal of Hospital Pharmacy, 40, 1016–1019.
- Hamwi, G. J. (1964). Therapy: Changing dietary concepts. In Diabetes Mellitus: Diagnosis and Treatment. American Diabetes Association.