Ideal Weight Calculator
Find your ideal body weight using 4 popular medical formulas
Enter your height above to calculate your ideal weight.
What is an Ideal Weight Calculator?
An ideal weight calculator estimates a healthy target weight based on your height and sex using established medical formulas. This calculator shows results from four widely used formulas — Devine, Robinson, Miller, and Hamwi — each developed for different clinical contexts. Because ideal weight is influenced by muscle mass, bone density, and body composition, these formulas provide a useful reference range rather than a single definitive number.
How to Use the Ideal Weight Calculator
- Select your sex and preferred unit system
- Enter your height in cm (metric) or feet and inches (imperial)
- Results from all four formulas appear instantly
- Use the range across formulas as your healthy weight target zone
Features
- Four formulas: Devine, Robinson, Miller, and Hamwi
- Separate calculations for male and female
- Supports metric (cm) and imperial (ft/in) height input
- Results shown in both kg and lb
- Instant reactive calculation — no submit button needed
Frequently Asked Questions
Which formula is most accurate?
No single formula is universally most accurate. The Devine formula is most commonly used in clinical settings for drug dosing. The Robinson formula is often considered a refinement of Devine. Looking at the range across all four formulas gives a more reliable target zone.
Why do the formulas only work for heights above 5 feet?
These formulas were derived from population studies of adults and use 5 feet (60 inches) as the baseline. They are not validated for heights below 5 feet and may produce inaccurate results outside that range.
Is ideal weight the same as healthy weight?
Not exactly. Ideal weight formulas give a single target, while healthy weight is typically expressed as a range (e.g., BMI 18.5–24.9). Athletes with high muscle mass may weigh more than the ideal weight formula suggests while still being very healthy.