Ideal Weight Calculator
The Ideal Weight Calculator estimates a healthy target weight using the Devine and Robinson formulas — two widely referenced clinical methods — plus the healthy BMI weight range for your height.
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How This Tool Works
Enter your sex and height to see an estimated ideal weight (averaging two clinical formulas) alongside the healthy BMI weight range for your height.
Formula & Method
Devine formula: men = 50kg + 2.3kg per inch over 5ft; women = 45.5kg + 2.3kg per inch over 5ft. Robinson formula: men = 52kg + 1.9kg per inch over 5ft; women = 49kg + 1.7kg per inch over 5ft. We average both.
Example Calculation
A woman 5'6" tall has an estimated ideal weight of about 134 lb, with a healthy BMI range of roughly 114–154 lb.
Frequently Asked Questions
Which formula is most accurate?+
No single formula is perfect for everyone — averaging the Devine and Robinson formulas gives a reasonable general estimate, but body composition and frame size matter too.
Why does the healthy BMI range differ from the ideal weight estimate?+
The Devine and Robinson formulas were developed for medication dosing, while the BMI range comes from a completely different population health standard — both are useful reference points.
Does this account for muscle mass?+
No, these formulas are based on height and sex alone. Athletes and muscular individuals may healthily weigh more than these estimates suggest.
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