Ideal Weight Calculator
Compare Devine, Robinson, Miller, and Hamwi height-based weight estimates. The calculator also shows an adult BMI 18.5–24.9 range in both pounds and kilograms.
Ideal Weight Calculator tool
About the Ideal Weight Calculator
These historical formulas can help explain why different tools return different numbers, but they do not establish a uniquely ideal weight. Results are estimates and not medical advice.
How Is Ideal Weight Calculated?
The equations below describe the calculation. Use the units specified in each expression; results are rounded for display.
Let x = height (in) − 60; formulas apply at heights of at least 5 ft
Devine kg: male 50 + 2.3x; female 45.5 + 2.3x
Robinson kg: male 52 + 1.9x; female 49 + 1.7x
Miller kg: male 56.2 + 1.41x; female 53.1 + 1.36x
Hamwi lb: male 106 + 6x; female 100 + 5x
Healthy BMI range kg = 18.5 to 24.9 × height (m)^2
Example
A 5 ft 10 in male has x = 10: Devine 73.0 kg, Robinson 71.0 kg, Miller 70.3 kg, and Hamwi 166 lb (75.3 kg).
How to Use the Ideal Weight Calculator
- Choose US customary or metric units.
- Enter your height; in US units, use whole feet and remaining inches from 0 to less than 12.
- Select the sex used by the historical formulas.
- Read the live result and calculation breakdown; correct any validation messages.
- Use Reset to restore the sample values, or copy the result for discussion with a clinician.
Ideal Weight Calculator Examples
Male at 5 ft 10 in
At 177.8 cm, Devine gives 73.0 kg (160.9 lb), Robinson 71.0 kg (156.5 lb), Miller 70.3 kg (155.0 lb), and Hamwi 75.3 kg (166.0 lb).
Female at 5 ft
At 152.4 cm, the female estimates are Devine 45.5 kg, Robinson 49.0 kg, Miller 53.1 kg, and Hamwi 100 lb (45.4 kg).
Units and rounding
One inch is exactly 2.54 cm and one pound is exactly 0.45359237 kg. Results are rounded to one decimal for display.
Formula limitations
The formulas were designed for heights of at least 5 feet. They omit body composition and should not be used as rigid targets or medication dosing instructions.
Frequently Asked Questions
Why are there four answers?
Each historical formula uses different starting weights and increments per inch. None accounts fully for individual health or body composition.
What if I am shorter than 5 feet?
The calculator does not extrapolate these formulas below 152.4 cm. It still shows the adult BMI reference range.
Is the BMI range more personalized?
It depends on height but not muscle, frame size, age, or medical history. It remains a screening reference.
Which weight should I aim for?
Choose goals with a qualified clinician who can consider your history, nutrition, function, and relevant health measurements.
Can children use this tool?
No. Children and teens need growth assessment and BMI-for-age rather than adult BMI cutoffs or these historical formulas.