Ideal Weight Calculator
What is Ideal Weight?
“Ideal weight” is an estimate of a healthy body weight based on your height (and sex, depending on the formula). This calculator reports several classic formulas (Devine, Robinson, Miller, Hamwi) and shows the healthy **BMI range** for context.
These formulas are guides, not medical advice. Body composition, age, and frame size matter.
How the calculator works
- Select Male or Female.
- Choose Metric or Imperial units.
- Enter your age and height in the visible fields.
- Press Calculate to see multiple ideal-weight estimates and the healthy BMI range.
- Use Copy or Share to save your results.
Age is collected for context. The classic formulas themselves do not directly use age.
Inputs & Units
- Sex: used by Devine, Robinson, Miller, Hamwi.
- Age: shown in results for context (not used by the formulas).
- Height: Metric (cm) or Imperial (ft + in).
- Only the fields for your chosen unit appear to prevent input mistakes.
Tip: Stand straight without shoes; measure height against a wall for accuracy.
Formulas included
Devine
Male: 50 + 2.3 × (in − 60) kg
Female: 45.5 + 2.3 × (in − 60) kg
Robinson
Male: 52 + 1.9 × (in − 60) kg
Female: 49 + 1.9 × (in − 60) kg
Miller
Male: 56.2 + 1.41 × (in − 60) kg
Female: 53.1 + 1.41 × (in − 60) kg
Hamwi
Male: 106 lb + 6 lb × (in − 60)
Female: 100 lb + 5 lb × (in − 60)
“in” = total height in inches. Hamwi is shown in lb by definition; the tool converts to kg as well.
Interpreting your results
Different formulas were designed for different clinical settings and populations. It’s normal to see slightly different “ideal” numbers. The **healthy BMI range (18.5–24.9)** provides an additional reference band for your height.
Helpful tips
- Use recent height data; small changes affect results.
- Stick to one unit system per calculation.
- Consider body composition (muscle vs fat) when choosing a target.
Common mistakes
- Mixing feet with kilograms or centimeters with pounds.
- Forgetting inches when entering imperial height.
- Treating a single formula’s result as a strict goal.
Frequently asked questions
Which formula should I trust the most?
None is universally “best.” Compare the range and choose a realistic target informed by your body composition and goals.
Does age change “ideal weight”?
Classic formulas do not use age. However, age can change muscle mass and health priorities—use the results as guidance, not rules.
How do I convert between kg and lb?
1 kg ≈ 2.2046 lb. The tool shows both units for convenience.
Should I set my goal exactly to one number?
A target range is usually more practical and sustainable than a single number.
Important note
These results are estimates and do not replace medical advice. Speak with a professional for individualized targets.