⚖️ Ideal Weight Calculator
Find your ideal weight range based on your height, sex, and frame size using the four most trusted clinical formulas. Get a realistic, evidence-based weight target — not a number from a magazine.
📖 Ideal Weight Formulas Explained
Several evidence-based formulas estimate ideal body weight. Each was developed for different clinical uses, such as medication dosing and surgical planning. Most produce similar results within 5–10 lbs of each other.
The Four Major Formulas
- Devine (1974): Men: 50 + 2.3 × (height in inches over 5 ft). Women: 45.5 + 2.3 × (height in inches over 5 ft). Originally for drug dosing.
- Robinson (1983): Men: 52 + 1.9 × (height in inches over 5 ft). Women: 49 + 1.7 × (height in inches over 5 ft). Revision of Devine.
- Miller (1983): Men: 56.2 + 1.41 × (height in inches over 5 ft). Women: 53.1 + 1.36 × (height in inches over 5 ft).
- Hamwi (1964): Men: 106 lbs for 5 ft + 6 lbs/inch over. Women: 100 lbs for 5 ft + 5 lbs/inch over. Oldest and simplest formula.
⚠️ No Single "Ideal" Weight Exists
These formulas provide useful guidelines, but your optimal weight depends on muscle mass, bone density, age, and genetics. An athlete may weigh more than these formulas suggest while being very healthy. Use these numbers as a range, not a rigid target.
❓ Frequently Asked Questions
Are ideal weight formulas accurate? −
Ideal weight formulas like Devine, Robinson, Miller, and Hamwi were originally developed for clinical uses like medication dosing, not as fitness targets. They provide useful reference ranges but don't account for muscle mass, bone density, or body composition. A muscular athlete may weigh well above these values while being in excellent health.
What's better — ideal weight or BMI? +
Both have limitations. BMI is simpler and widely used, but doesn't distinguish muscle from fat. Ideal weight formulas are similar but slightly more refined. For the most accurate assessment of healthy weight, body fat percentage (via DEXA scan, hydrostatic weighing, or bioelectrical impedance) is more informative than either.
Does frame size affect ideal weight? +
Yes — people with larger bone structures (larger frame size) naturally weigh more and have a different healthy weight range. You can estimate frame size by wrapping your fingers around your wrist: if they overlap, you're small-framed; if they just touch, medium; if they don't touch, large-framed.
How does age affect ideal weight? +
Standard ideal weight formulas don't adjust for age. However, research shows that slightly higher weights may be healthier for adults over 65, as having some extra body mass provides a buffer against illness and injury. Muscle mass also naturally decreases with age, so maintaining muscle (through strength training) is important.
What if I want to reach my ideal weight? +
A safe rate of weight loss is 0.5–2 lbs per week through a calorie deficit of 250–1000 calories per day. For weight gain, target a surplus of 250–500 calories. Focus on whole foods, adequate protein (0.7–1g per lb of body weight), and regular exercise — especially strength training to maintain or build muscle.