The Broca and Devine Formulas are two Methods for Calculating Ideal Body Weight. Broca’s Formula is Simple and Older, using just Height, while Devine’s Formula is More Complex, using Height and Gender, and is often used for Medical Dosing.
For example, the Divine formula is used mainly in medical settings:
- Men: IBW (kg)=50+2.3×(height in inches−60)
- Women: IBW (kg)=45.5+2.3×(height in inches−60)
- Accounts for sex differences and provides a more precise estimate than Broca.
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Broca Formula – older, simpler method:
- Formula: Ideal weight (kg)=height (cm)−100
- Quick and easy but less precise; it doesn’t differentiate between sexes in the original version.
Broca index ideal weight calculation
Use this basic formula for Broca index ideal weight calculation
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\(\text{Ideal Weight (kg)} = \text{Height (cm)} – 100\)How does body frame size affect ideal weight
Body Frame Size affects Ideal Weight by giving a framework to adjust for natural differences in bone density and muscle mass. People with a Large Frame mostly have a higher ideal weight due to a denser skeleton and more muscle, while those with a Smaller Frame mostly have a lower ideal weight. A common adjustment is to increase or decrease the standard weight calculation by about 10% for Large or Small Frames.
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FAQs about Ideal Weight (Broca/Devine formulas)
What is the Divine formula for ideal body weight?
The Divine formula estimates ideal body weight as Men: 50 kg + 2.3 kg per inch over 5 ft; Women: 45.5 kg + 2.3 kg per inch over 5 ft, providing a quick guideline based on height.
How do I use the Broca index to find my ideal weight?
The Broca index calculates ideal weight as Height in cm − 100 for men, and Height − 104 for women, giving a simple estimate of ideal body weight.
What is the main difference between the Broca and Devine formulas?
The main difference is that Broca’s formula uses a simple height-based subtraction, while Devine’s formula adds a per-inch adjustment for height over 5 ft and differs for men and women.
How does body frame size affect ideal weight?
Body frame size affects ideal weight because larger frames typically support more muscle and bone mass, so individuals with bigger frames may have a higher healthy weight than those with smaller frames at the same height.
Is ideal weight the same as healthy weight?
Not always because ideal weight is a guideline based on formulas, while healthy weight considers body composition, fat distribution, and overall health.
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