Ideal Weight Calculator
Calculate your Ideal Body Weight (IBW) based on height and gender. This tool uses standard medical formulas including Devine, Hamwi, Robinson, and Miller.
What is Ideal Body Weight (IBW)?
Ideal Body Weight (IBW) refers to a weight range that is statistically associated with maximum life expectancy. While no single weight fits everyone, IBW formulas are often used by doctors to determine dosage for medications and to assess nutritional needs.
This Ideal Weight Calculator uses the most scientifically validated equations to give you a personalized estimate.
Understanding the Formulas
Different experts have proposed different methods over the years. We provide results for the top 4:
- Devine Formula (1974): Originally developed to calculate doses for medications like gentamicin. It is the most widely used standard in medicine.
- Hamwi Method (1964): A popular rule of thumb: 106 lbs for the first 5 feet (men) or 100 lbs (women) + 5-6 lbs for every inch over 5 feet.
- Robinson Formula (1983): A modification of the Devine formula designed to be more accurate based on empirical data.
- Miller Formula (1983): Another variation that often yields slightly different results, providing a good comparison point.
Ideal Weight vs. BMI
While IBW formulas give a specific number (e.g., 150 lbs), the Body Mass Index (BMI) gives a range (e.g., 125-168 lbs) considered "healthy".
- IBW is often seen as a target for a "medium" frame.
- BMI Range accounts for variations in bone density and muscle mass.
Most health professionals recommend aiming to be within the BMI healthy range rather than obsessing over a single "ideal" number.
For a more detailed look at your body composition, check out our Body Fat Calculator or calculate your BMI Score directly.
? Frequently Asked Questions
IBW formulas were created decades ago and often lean towards the lower end of the healthy spectrum. If you have a large frame or significant muscle mass, your healthy weight may be higher than the IBW result.
The Devine formula is the medical standard used in hospitals. However, the BMI range is generally more useful for personal health goals as it offers flexibility.
These specific formulas do not factor in age. However, modern research suggests that for older adults (65+), a slightly higher weight (BMI 25-27) may actually be protective against frailty.