Adjusted Body Weight Calculator
This calculator uses the Devine formula to estimate Ideal Body Weight (IBW) and calculates the Adjusted Body Weight (AjBW) for dosing and medical purposes.
Please consult your healthcare provider for personalized medical advice.
Measurement System:
Metric
Gender:
Male or Female
Height (cm):
Enter your height
Actual Body Weight (kg):
Enter your weight
Calculate Adjusted Body Weight
This calculator estimates your Ideal Body Weight (IBW) and Adjusted Body Weight (AjBW) using the Devine formula, which is commonly used in medical settings to adjust drug dosing and assess nutritional needs.
Please consult your healthcare provider for personalized medical advice.
What is Ideal Body Weight (IBW)?
Ideal Body Weight (IBW) is an estimate of a healthy body weight based on height and gender. It was originally developed to calculate medical dosages and has since been used to assess nutritional needs and health risks.
Devine Formula for IBW:
Male:
IBW (kg)=50 kg+2.3 kg for each inch over 5 feet\text{IBW (kg)} = 50 \text{ kg} + 2.3 \text{ kg for each inch over 5 feet}IBW (kg)=50 kg+2.3 kg for each inch over 5 feet
Female:
IBW (kg)=45.5 kg+2.3 kg for each inch over 5 feet\text{IBW (kg)} = 45.5 \text{ kg} + 2.3 \text{ kg for each inch over 5 feet}IBW (kg)=45.5 kg+2.3 kg for each inch over 5 feet
For heights under 5 feet, the formula subtracts 2.3 kg for each inch below 5 feet.
What is Adjusted Body Weight (AjBW)?
Adjusted Body Weight (AjBW) is used when an individual is overweight (usually when actual body weight is more than 30% above IBW). It adjusts the IBW to account for excess body fat that may not contribute to metabolic activity.
Adjusted Body Weight Formula:
AjBW=IBW+0.4×(Actual Body Weight−IBW)\text{AjBW} = \text{IBW} + 0.4 \times (\text{Actual Body Weight} - \text{IBW})AjBW=IBW+0.4×(Actual Body Weight−IBW)
Medical Dosing: AjBW is often used to calculate appropriate medication dosages, especially for drugs that are not distributed into fat tissue.
Nutritional Assessment: Helps dietitians and healthcare providers determine caloric needs for overweight or obese patients.
Renal Function Estimation: Used in formulas to estimate kidney function in overweight individuals.
Height
Height is a primary factor in determining IBW. The taller the person, the higher their IBW.
Gender
Males and females have different body compositions, so the formulas adjust accordingly.
Body Composition
Muscle Mass: Individuals with high muscle mass may weigh more but not have excess body fat.
Fat Distribution: The location of body fat can affect health risks but is not accounted for in IBW calculations.
FAQs About Adjusted Body Weight
1. Why use Adjusted Body Weight instead of Actual Body Weight?
AjBW provides a more accurate estimate for drug dosing and nutritional needs in overweight individuals by accounting for metabolically inactive fat mass.
2. Who should use Adjusted Body Weight?
Healthcare professionals use AjBW for patients who are overweight or obese, typically when actual body weight is more than 30% above IBW.
3. Can I use this calculator for children?
No, the formulas used are intended for adults. Consult a pediatric healthcare provider for children.
4. How accurate is the Devine formula?
The Devine formula is widely used but provides an estimate. Individual assessments are necessary for precise measurements.
5. Should I aim to reach my Ideal Body Weight?
IBW is a guideline. Consult a healthcare provider before making significant lifestyle changes to reach a specific weight.