What an “ideal weight” formula actually estimates
This calculator uses the Devine equation to produce a formula-based reference for an adult's height. It is not a measurement of health, a diagnosis, or a target every person should try to reach. The result doesn't account for an individual's medical history, body composition, frame, age, or other factors that matter in a real clinical assessment.
The equation used here
The Devine formula starts with a reference value at 5 feet and adds 2.3 kilograms for each inch above 5 feet: 50 kg for men and 45.5 kg for women at 5 feet, then + 2.3 × (inches above 60). The calculator converts the height into inches and displays the result in the selected unit. It is one historical equation among several and may not fit an individual.
How to interpret it
Treat the value as a mathematical reference, not a score or instruction. A review in the medical literature explains that “ideal body weight” equations grew out of older height–weight tables and later became used as reference values, including in drug-dosing contexts. That history is one reason not to treat a single formula as a universal definition of a healthy body. See The origin of the “ideal” body weight equations (PubMed).
This page is not designed to set weight goals for children or teens. Questions about growth, nutrition, or personal health are best discussed with a qualified healthcare professional who understands the individual's circumstances.
Tips for accurate results
Several formulas exist, including Devine, Robinson, Miller, and Hamwi, and they give different answers for the same height. Comparing them gives a range rather than a single target. Another approach is to find the weight range for your height that falls within a healthy BMI range.
Common mistakes and limits
These formulas were developed decades ago for specific purposes, such as estimating drug doses, and they do not account for muscle mass, bone structure, age, or ethnicity. An ideal weight is not a goal for everyone, and a clinician can help you decide what is appropriate for you.