Ideal Weight Calculator

Calculate your ideal body weight based on your height, gender, and frame size using 4 proven medical formulas

Frame size affects ideal weight by approximately ±10%. Choose "medium" if unsure.

Optional: Enter your current weight to see how it compares to your ideal weight.

What is Ideal Body Weight?

Ideal body weight (IBW) is an estimate of the weight range that's considered healthy for your height, gender, and frame size. It's used by healthcare professionals to assess health risks, calculate medication dosages, and set weight management goals.

Why Multiple Formulas?

Different medical formulas were developed for different purposes. This calculator uses 4 proven formulas (Devine, Robinson, Miller, and Hamwi) and averages them to give you a comprehensive estimate. Frame size adjustment ensures the result is personalized to your body structure.

How to Determine Your Frame Size

  • Small Frame: Wrist circumference less than 15.75 cm (6.2 in) for women, less than 16.5 cm (6.5 in) for men
  • Medium Frame: Wrist circumference 15.75-17 cm (6.2-6.7 in) for women, 16.5-19 cm (6.5-7.5 in) for men
  • Large Frame: Wrist circumference greater than 17 cm (6.7 in) for women, greater than 19 cm (7.5 in) for men

Limitations of Ideal Weight Calculators

Ideal weight formulas don't account for muscle mass, bone density, or body composition. Athletes and bodybuilders may weigh more than their "ideal weight" due to muscle mass, which is perfectly healthy. For a more accurate assessment, consider using our Body Fat Calculator alongside this tool.

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Medical Disclaimer

This calculator provides estimates for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making significant changes to your diet or exercise routine. Ideal weight is just one metric and doesn't account for individual factors like muscle mass, bone density, or medical conditions.

Understanding Ideal Weight

Ideal weight is an estimate of the body weight range associated with optimal health, longevity, and reduced disease risk for a given height. Unlike BMI alone, ideal weight calculations often consider factors like frame size, age, gender, and body composition goals. However, "ideal" is highly individual—an athlete's ideal weight differs from a sedentary person's, and health markers (blood pressure, cholesterol, energy levels) matter more than any single number.

Why Ideal Weight Matters

  • Health Benchmark: Provides a target range for minimizing risk of heart disease, diabetes, joint problems, and metabolic syndrome.
  • Goal Setting: Gives a concrete target for weight loss or gain efforts, making progress trackable and achievable.
  • Better Than BMI Alone: Accounts for individual factors BMI misses, like muscle mass and frame size.
  • Not One-Size-Fits-All: Your ideal weight depends on body composition goals (athletic performance vs general health vs bodybuilding).

Common Ideal Weight Formulas

  • Robinson Formula (1983): Most widely used. Men: 52 kg + 1.9 kg per inch over 5 feet. Women: 49 kg + 1.7 kg per inch over 5 feet.
  • Miller Formula (1983): Similar to Robinson. Men: 56.2 kg + 1.41 kg per inch over 5 feet. Women: 53.1 kg + 1.36 kg per inch over 5 feet.
  • Devine Formula (1974): Originally for drug dosing. Men: 50 kg + 2.3 kg per inch over 5 feet. Women: 45.5 kg + 2.3 kg per inch over 5 feet.
  • Hamwi Formula (1964): Quick estimation. Men: 106 lbs + 6 lbs per inch over 5 feet. Women: 100 lbs + 5 lbs per inch over 5 feet. ±10% for frame size.

Adjusting for Frame Size

  • Small Frame: Subtract 10% from calculated ideal weight. Narrow shoulders, thin wrists (wrist circumference under 6.5" for women, under 7" for men).
  • Medium Frame: Use calculated ideal weight as-is. Average bone structure.
  • Large Frame: Add 10% to calculated ideal weight. Broad shoulders, thick wrists (wrist circumference over 6.5" for women, over 7.5" for men).

Why Ideal Weight Is Just a Starting Point

  • Doesn't Account for Muscle Mass: A 6'0" bodybuilder at 200 lbs with 10% body fat is far healthier than a 6'0" sedentary person at 175 lbs with 30% body fat, despite being "over" ideal weight.
  • Individual Goals Vary: A powerlifter's ideal weight for performance differs from a runner's ideal weight for endurance or a model's ideal weight for aesthetics.
  • Health Markers Matter More: Blood pressure, cholesterol, blood sugar, waist circumference, and energy levels are better health indicators than weight alone.
  • Age and Lifestyle: Ideal weight at 25 vs 55 differs due to muscle loss (sarcopenia), hormonal changes, and activity levels.

Better Metrics Than Ideal Weight Alone

  • Body Fat Percentage: More accurate than weight. Healthy ranges: 10-20% for men, 18-28% for women.
  • Waist-to-Height Ratio: Waist should be less than half your height. Better predictor of cardiovascular disease than BMI or weight.
  • Waist Circumference: Men should be under 40 inches, women under 35 inches to minimize metabolic disease risk.
  • Lean Body Mass: Track muscle mass separately from fat mass. Preserving muscle during weight loss is crucial.
  • Performance and Energy: Can you perform daily activities comfortably? Do you have consistent energy? These matter more than any number.

Using Ideal Weight for Goal Setting

  • Weight Loss Goals: Use ideal weight as a general target range, not an exact number. Focus on sustainable fat loss (0.5-1% bodyweight per week) rather than crash dieting to hit a number.
  • Weight Gain Goals: If underweight, aim to reach ideal weight range through muscle gain (strength training + calorie surplus) rather than just eating more junk food.
  • Maintenance Goals: If within ideal weight range but unhappy with body composition, focus on body recomposition (lose fat + gain muscle) at maintenance calories.
  • Athletic Goals: Don't obsess over ideal weight formulas. Focus on performance, strength, and body composition for your sport.