The Four Ideal Weight Formulas
There is no single universally agreed-upon "ideal weight." Instead, four widely used formulas each produce slightly different results because they were developed for different populations and purposes:
- Devine (1974): Originally developed for calculating drug dosages, not ideal weight. Most commonly used in clinical settings.
- Robinson (1983): A modification of the Devine formula using updated population data.
- Miller (1983): Tends to produce the highest ideal weight estimates, making it the most generous formula.
- Hamwi (1964): The oldest formula, commonly used in dietetics and nursing education.
Our Ideal Weight Calculator shows results from all four formulas so you can see the range rather than fixating on a single number.
Why a Range Is More Useful Than a Number
A healthy weight exists across a range, not at a single point. An ideal weight of "165 lbs" is less useful than "155-175 lbs" because it accounts for individual variation in muscle mass, bone density, and frame size. Athletes with significant muscle mass will naturally weigh more than sedentary individuals of the same height without being less healthy.
A Note on Body Image
These formulas provide general guidelines based on population averages. They do not account for individual body composition, genetics, or personal health history. If you have a history of disordered eating or body image concerns, please approach these numbers as rough reference points and consult a healthcare professional for personalized guidance. Your worth is not determined by a number on a scale.
Find Your Range
Use our free Ideal Weight Calculator to see your range across all four formulas. For a more complete picture, also check your body fat percentage - body composition is ultimately more important than scale weight.
