Ideal Weight Calculator
Adjust the inputs below. Results update as you type.
How it works
Devine (men): IBW = 50 kg + 2.3 kg per inch over 5 feet. Women: 45.5 + 2.3. Robinson and Miller use slightly different constants. These formulas were developed for clinical drug dosing and may not reflect fitness goals. The 'ideal' weight range compatible with good health is wide—BMI 18.5–24.9 translates to a 20–30 lb window for most heights.
Input guidance
- Use measured values (recent weight, height, activity level) rather than guesses.
- Recalculate every few weeks as your routine and body metrics change.
- Pair screening metrics with context such as sleep, stress, and medical history.
The formula
Formulas like Devine estimate ideal weight from height: men ≈ 50 kg + 2.3 kg per inch over 5 feet; women ≈ 45.5 kg + 2.3 kg per inch over 5 feet.
Worked example
A man 5 feet 10 inches tall: 50 + 2.3 × 10 = 73 kg (about 161 lb) as a rough ideal-weight estimate.
More examples to test
- Maintenance case: keep activity constant and observe expected baseline ranges.
- Adjustment case: change only one major variable to understand sensitivity.
How to interpret results
Use results for awareness and planning, then validate with qualified medical or nutrition professionals for individualized decisions.
When this can be inaccurate
Population formulas cannot account for all biological factors such as medical conditions, medication effects, body composition differences, and genetics.
Change history
- July 2026: Quality-reviewed for publication with formula checks and explanatory copy updates.
Site-wide corrections also appear on the corrections log.
Track fitness goals with a top app
General wellness resource.
Frequently asked questions
Is there one ideal weight?+
No. These formulas give a reference range, not a precise target. Healthy weight varies with frame size, muscle, and individual health.
Which formula is best?+
Devine, Robinson, Miller, and Hamwi give slightly different numbers. They agree closely and are best treated as a range rather than a single figure.
Should I aim for ideal weight exactly?+
Use it as guidance. Body composition, fitness, and how you feel matter more than hitting an exact number from a height-based formula.
Can this calculator diagnose a condition?+
No. It is a screening and education tool only, not a clinical diagnosis.
When should I seek professional advice?+
Seek professional advice when results are extreme, persistent, or conflict with symptoms, goals, or prior medical guidance.
Guided next steps
Want the full workflow? Use this calculator inside a step-by-step guide.