Ideal Weight Calculator

Determining your ideal body weight is a fundamental step toward understanding your health and setting realistic fitness goals. The concept of ideal weight has been studied for over a century, with multiple evidence-based formulas developed by physicians and researchers to estimate the weight that is most strongly associated with longevity and minimal disease risk for a given height. Unlike arbitrary beauty standards, medically-derived ideal weight formulas are grounded in epidemiological data linking body weight to health outcomes.

This Ideal Weight Calculator applies four of the most widely used clinical formulas simultaneously: the Devine formula (1974), the Robinson formula (1983), the Miller formula (1983), and the Hamwi formula (1964). Each formula was derived from different population samples and clinical contexts, which is why they produce slightly different results. By presenting all four alongside their average, this tool gives you a well-rounded estimate rather than relying on a single formula that may not suit your body type.

The Devine formula is the most commonly cited in pharmacological dosing and clinical practice, originally developed for drug dosage calculations. The Robinson formula was created as a refinement of the Devine formula using actuarial data from the Metropolitan Life Insurance Company. The Miller formula tends to give slightly higher ideal weights, reflecting data from broader population studies. The Hamwi formula, the oldest of the four, was developed for quick clinical estimates and is still widely used in dietetics practice. All four formulas use height as the primary variable and account for gender differences in body composition.

It is important to understand that ideal weight is a range, not a single number. Individual variation in bone density, muscle mass, body frame size, and genetic factors means that two people of the same height and gender may have different truly optimal weights. These formulas provide a scientifically-grounded starting point, but they should be interpreted alongside other measurements such as body fat percentage, waist circumference, and overall fitness level. People with larger frames or greater muscle mass may have ideal weights above the formula estimates, while those with smaller frames may fall below.

Our calculator supports both metric and imperial units. Enter your height and gender to instantly see results from all four formulas plus their average. Use this information as a guide for setting health goals, discussing weight management with your healthcare provider, or benchmarking your current weight against clinical standards. Remember that the best weight for you is one at which you feel energetic, healthy, and able to maintain an active lifestyle.