Calculate your ideal weight based on height, age, and gender using multiple formulas.
Ideal weight is calculated using various medical formulas. Your ideal weight depends on multiple factors including height, gender, age, body frame, and muscle mass.
There is no single ideal weight, so this calculator shows five established estimates side by side. The Devine formula (1974) gives 50 kg plus 2.3 kg per inch over 5 feet for men, and 45.5 kg plus 2.3 kg per inch for women; the Robinson, Miller, and Hamwi formulas use the same structure with different base weights and per-inch slopes. A fifth estimate is derived from body mass index, using a BMI of 22, the middle of the normal range.
Your frame size works as a percentage adjustment across the four formulas: choosing a small frame lowers each result by 10 percent, a large frame raises it by 10 percent, and medium leaves them untouched. The recommended range at the top of the results is simply the span from the lowest to the highest of the five values.
Treat these numbers as orientation, not targets. The formulas were built from limited mid-20th-century populations, Devine was originally designed for medication dosing, and none of them know whether your weight comes from muscle or fat. For a fuller picture, cross-check with our BMI calculator or the body fat calculator.
None is definitively best. Devine remains the most widely cited, partly because it is embedded in clinical drug-dosing guidelines, but each formula underestimates or overestimates for different heights and builds. This page shows all of them together precisely because they disagree; the spread between them is informative.
Each was derived from a different reference population and set of assumptions, so both the base weight and the amount added per inch of height differ. Miller, for example, adds only 1.41 kg per inch for men while Hamwi adds 2.7 kg. Across eight or ten inches of height difference, that gap compounds quickly.
A common method compares wrist circumference to height: larger wrists relative to height suggest a larger frame. Another quick check is to wrap your thumb and middle finger around your wrist; overlapping fingers suggest a small frame and fingers that do not touch suggest a large one. It is a rough classification, which is why the calculator only adjusts results by 10 percent.
Barely, in these formulas. The classic equations were designed for adults and essentially ignore age beyond a minimum of 18. Body composition does shift over the years, with muscle tending to decline and fat increasing, which is one more reason to treat the output as a rough anchor rather than a prescription.
Not exactly. Health research generally talks about ranges rather than one number, such as the normal BMI range of 18.5 to 24.9. The lowest-to-highest span this calculator displays approximates that idea. The BMI calculator gives you the range-based view directly from your current height and weight.