The Hamwi formula is a method used to estimate ideal body weight (IBW) based on a person's height.
Explanation of the Hamwi Formula
The Hamwi formula, developed by Dr. George Hamwi, provides a relatively simple way to calculate ideal body weight. It differs for men and women and is based on the "first 5 feet" and then an increment for each additional inch. While considered a dated formula and not perfect, it is still sometimes used, especially in clinical settings.
Formulas
Here are the formulas:
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For Men:
- IBW = 106 pounds for the first 5 feet + 6 pounds for each inch over 5 feet.
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For Women:
- IBW = 100 pounds for the first 5 feet + 5 pounds for each inch over 5 feet.
Metric Conversion
Here are the metric conversions, as implied in the provided references:
- For Men:
- IBW = 48 kg for the first 152.4 cm + 1.1 kg for each additional cm.
Example Calculations
Let's look at a few examples:
Example 1: Man, 5'10"
- Convert height to inches: 5 feet * 12 inches/foot + 10 inches = 70 inches
- Inches over 5 feet: 70 inches - (5 feet * 12 inches/foot) = 70 inches - 60 inches = 10 inches
- IBW: 106 pounds + (10 inches * 6 pounds/inch) = 106 pounds + 60 pounds = 166 pounds
Example 2: Woman, 5'4"
- Convert height to inches: 5 feet * 12 inches/foot + 4 inches = 64 inches
- Inches over 5 feet: 64 inches - (5 feet * 12 inches/foot) = 64 inches - 60 inches = 4 inches
- IBW: 100 pounds + (4 inches * 5 pounds/inch) = 100 pounds + 20 pounds = 120 pounds
Important Considerations
It is crucial to remember that the Hamwi formula provides a general estimate of ideal body weight. It does not account for body composition (muscle vs. fat), age, frame size, or other individual factors. Therefore, it should be used as a starting point and interpreted with caution. A healthcare professional should always be consulted for personalized advice regarding healthy weight.
