Ideal Weight Calculator

Ideal body weight (IBW) formulas were originally developed in the mid-20th century for medical purposes such as drug dosing and ventilator settings. The Devine formula (1974) became the clinical standard, though later research by Robinson and Miller suggested adjustments based on more recent population data. These formulas estimate the weight associated with lowest mortality risk for a given height, but they do not account for muscle mass, bone density, or individual metabolic health.

Body Mass Index (BMI)

BMI is calculated as weight in kilograms divided by height in meters squared. The World Health Organization defines underweight as BMI below 18.5, normal as 18.5–24.9, overweight as 25–29.9, and obese as 30 or above. While BMI is easy to calculate and widely used in epidemiology, it was never intended as a diagnostic tool for individuals. For more, see the Wikipedia articles on Body mass index and Ideal body weight.

Body Composition vs. Scale Weight

Modern health science emphasizes body composition over scale weight. A DEXA scan can measure bone density, lean mass, and fat mass with high accuracy. Bioelectrical impedance scales provide rough estimates at home. Tracking waist circumference is also valuable because visceral fat around organs poses greater cardiovascular risk than subcutaneous fat.

Calculate your BMI for a quick health screening, estimate daily calories with the BMR Calculator, or measure body fat with our Body Fat Calculator. For nutrition planning, try the Calorie Calculator.