Ideal Weight Calculator

How ideal weight is calculated

There is no single universally correct ideal weight — it depends on your body composition, bone structure, muscle mass, and overall health. This calculator uses five well-established formulas to provide a range of estimates rather than a single rigid number. The Devine (1974), Robinson (1983), Miller (1983), and Hamwi (1964) formulas were originally developed for clinical applications such as medication dosing and are based on height and sex. Each uses a slightly different base weight and increment per inch of height, which is why results vary between them. The fifth estimate uses the midpoint of the healthy BMI range (21.75), as defined by the World Health Organization, to calculate a weight that corresponds to the center of the normal BMI category. By averaging all five formulas, the calculator produces a balanced target that reduces the bias inherent in any single method. However, these formulas have limitations — none account for muscle mass, bone density, age, or ethnicity, all of which influence what a truly healthy weight looks like for you personally.

What your result means

Your result is a general guideline based on statistical averages — not a strict target you must hit. A person with significant muscle mass from strength training may weigh considerably more than the calculated ideal without being overweight or unhealthy. Similarly, someone with a naturally smaller frame may be perfectly healthy at a weight below the estimated range. The spread between the highest and lowest formula results illustrates how much expert opinion varies on this topic. Rather than fixating on a single number, use the range as a reference band that defines a reasonable neighborhood for your weight. According to the World Health Organization, health outcomes are more closely linked to body composition, waist circumference, and metabolic markers than to weight alone. If your current weight falls significantly above or below the calculated range, or if you have concerns about your weight, consult a healthcare professional who can evaluate your full health picture — including body fat percentage, blood pressure, blood sugar levels, and cardiovascular fitness — to provide truly personalized guidance.

Frequently Asked Questions