Ideal Weight Calculator
About Ideal Weight Calculator
What Is Ideal Body Weight?
Ideal body weight (IBW) is a clinically estimated weight range associated with the lowest risk of weight-related health problems for a given height. Unlike BMI, which provides a single classification, ideal weight formulas were developed to help physicians calculate drug dosages, set ventilator parameters, and establish nutrition goals. Several formulas exist because no single equation perfectly captures the complexity of human body composition. The most commonly cited are the Devine formula (1974), the Robinson formula (1983), the Miller formula (1983), and the Hamwi formula (1964). Each produces slightly different results, which is why this calculator shows all of them.
Popular Ideal Weight Formulas
The Devine formula for men is: 50 + 2.3 kg per inch over 5 feet. For women: 45.5 + 2.3 kg per inch over 5 feet. The Robinson formula adjusts these to 52 + 1.9 per inch (men) and 49 + 1.7 per inch (women). The Miller formula uses 56.2 + 1.41 per inch (men) and 53.1 + 1.36 per inch (women). Each formula was derived from different population studies, which explains the variation. The healthy BMI range method simply calculates the weight range that produces a BMI between 18.5 and 24.9 for your height.
How to Use This Calculator
Enter your height, select your gender, and optionally provide your age and frame size. The calculator displays results from four established formulas plus the healthy BMI weight range. This gives you a comprehensive picture rather than a single number. Your ideal weight likely falls somewhere within the range suggested by these formulas. Use the results as general guidance and consult a healthcare provider for personalized advice.
Frequently Asked Questions
Why do different formulas give different results?
Each formula was developed using different study populations and methodologies. The variation reflects genuine scientific uncertainty about what constitutes an ideal weight. Consider the range of results rather than fixating on a single number.
Does frame size matter?
Yes. People with larger bone structures naturally weigh more. You can estimate frame size by measuring your wrist circumference relative to your height. Large-framed individuals should aim for the higher end of the ideal weight range.
Is ideal weight the same as healthy weight?
They are related but not identical. Ideal weight is a clinical estimate, while healthy weight is a broader range where disease risk remains low. You can be healthy at weights that differ from formula-calculated ideals.
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