Determining Ideal Body Weight

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Determining Ideal Body Weight
Using Percent Body Fat and the Body Mass Index
Purpose:
There are a number of different ways to compute an ideal body weight. Method A of this laboratory allows
you to compute and record your ideal body weight using the percent body fat method. Method B allows
you to calculate and record your ideal body weight using the body mass index procedure.
Directions:
Choose one of these techniques and complete the appropriate section.
Method A: Computation of Ideal Body Weight
Using Percent Body Fat
Step 1: Calculate fat-free weight
100% - your percent body fat estimated from skinfold measurement = ______% fat free weight.
Therefore,
______% fat-free weight expressed as a fraction x your body weight in pounds = ______ pounds fat-free
weight.
Step 2: Calculate optimal weight
Remember: Optimal body fat ranges are 10% to 20% for men and 15% to 25% for women.
Optimal weight = fat-free weight/(1.00 - optimal %fat), with optimal %fat expressed as a fraction.
Therefore,
The low and high optimal weight ranges for your gender are:
For low %fat: Optimal weight = ______ pounds
For high %fat: Optimal weight = ______ pounds
Method B: Computation of Ideal Body Weight
Using Body Mass Index
The BMI uses the metric system. Therefore, you need to determine your weight in kilograms (1 kilogram =
2.2 pounds) and your height in meters (1 inch = 0.0254 meters).
Step 1: Compute your BMI.
2
BMI = body weight (kg)/(height in meters)
Your BMI = ________________

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