How this Ideal Weight Calculator Works
"Ideal Weight" is not a single number but rather a range or estimation based on population averages. Different researchers have developed various formulas over the decades to estimate the ideal body weight (IBW) based on height and gender. This calculator provides results from the four most popular medical formulas.
The 4 Major Formulas
- Hamwi Formula (1964): Originally designed for calculating medication dosages. It is one of the most commonly used formulas in clinical settings.
- Devine Formula (1974): Widely used by doctors to calculate the dosage of certain drugs (like aminophylline) and is the most common standard for IBW.
- Robinson Formula (1983): A modification of the Devine formula that was refined based on updated population data.
- Miller Formula (1983): Another variation that tends to result in slightly lower weight estimates than the others.
Devine (Men): 50 kg + 2.3 kg per inch over 5 feet
Devine (Women): 45.5 kg + 2.3 kg per inch over 5 feet
Ideal Weight vs. BMI
The top result shown in large text is a Range based on the Body Mass Index (BMI). Medical professionals generally agree that a "Healthy" BMI falls between 18.5 and 24.9. This range is often more realistic and flexible than the specific formulas, which provide a single "ideal" number.
Step-by-Step Instructions
- Select Units: Choose Metric (cm/kg) or Imperial (feet/inches).
- Select Gender: The formulas use different base weights for men and women.
- Enter Height: Input your height accurately.
- Compare Results: Review the different formula outputs. If they are all similar, you have a strong estimate. If they vary, aim for the BMI range.