Ideal Weight Calculator — Ideal Body Weight by Height & GenderDevine · Robinson · Miller · Hamwi Formulas · kg · lbs · Men & Women
Use this free Ideal Weight Calculator to instantly estimate your ideal body weight (IBW) and healthy weight range based on your height and biological sex — using the four most widely referenced ideal body weight formulas in clinical medicine and nutrition science: Devine Formula (1974) · Robinson Formula (1983) · Miller Formula (1983) · Hamwi Formula (1964) — all expressed in both kilograms (kg) and pounds (lbs) for easy reference. Results include your ideal weight range, current weight vs ideal weight comparison, weight to lose or gain, and your corresponding BMI classification — giving you a complete picture of your target body weight goal.
This ideal body weight calculator is used across a wide range of health, fitness, and clinical applications: general health awareness & healthy weight range estimation · weight loss goal setting & calorie deficit planning · clinical medication dosing & drug dose calculation by IBW · fitness and bodybuilding target physique planning · nutritional assessment & dietitian consultation reference · BMI, body fat percentage & waist circumference cross-reference. Trusted by individuals tracking weight management goals, personal trainers and fitness coaches, registered dietitians (RDs), clinical pharmacists calculating adjusted body weight (ABW), and general practitioners for a quick, evidence-based healthy weight benchmark grounded in decades of medical reference data.
⚠ Medical Disclaimer: This ideal weight calculator provides a population-based reference estimate only and is intended for general health awareness and informational purposes. Ideal body weight formulas do not account for individual variations in lean muscle mass, bone density, body frame size (small, medium, large), age-related body composition changes, ethnicity-specific weight norms, or underlying medical conditions such as hypothyroidism, PCOS, or fluid retention. For a clinically accurate assessment of your healthy weight, body composition, and weight management goals, always consult a licensed doctor, registered dietitian (RD), or certified nutritionist who can evaluate your full health profile, BMI, body fat percentage, and metabolic health.
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Ideal Weight Calculator — What Multiple Evidence-Based Formulas Actually Suggest
"Ideal weight" is a contested concept because the weight associated with optimal health outcomes varies by body composition, age, ethnicity, and what health outcome you are optimizing for. The calculator presents four evidence-based formulas that are commonly cited in medical literature: Hamwi (1964), Devine (1974), Robinson (1983), and Miller (1983). These formulas all produce slightly different results from height — a 5'10" man ranges from 166 to 175 lbs across the four formulas. Rather than presenting one authoritative number, the calculator shows all four alongside the BMI-based healthy weight range so you see the realistic spread.
The BMI-based healthy weight range (18.5-24.9 kg/m²) produces a wide range for tall individuals. A 6'2" person's healthy BMI range spans from 145 lbs to 194 lbs — a 49-pound range that includes very different body compositions. For an athlete with high muscle mass, the upper end of this range at relatively low body fat is healthier than the lower end at minimal muscle. The formulas, which produce a single point estimate, and the BMI range together give a more complete picture than either alone.
Ideal weight for athletic performance differs from ideal weight for longevity. Distance runners optimize power-to-weight ratio and often operate at the low end of healthy BMI. Powerlifters maximize strength output and operate well above the healthy BMI range by weight alone, but with body fat percentages in the fitness category. The calculator notes that these performance-optimized weights may differ substantially from health-optimized weights and encourages body composition assessment alongside any weight target.