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How do you calculate total fat mass?

Published in Body Composition 2 mins read

To calculate total fat mass, you need to know your body weight and body fat percentage. Here's how:

  1. Convert body fat percentage to a decimal: Divide your body fat percentage by 100.
  2. Multiply decimal by total weight: Multiply the resulting decimal by your total weight (in kilograms or pounds). This gives you your fat mass.

Calculation Example:

Let's say you weigh 80kg and your body fat percentage is 15%.

  1. Decimal conversion: 15% / 100 = 0.15
  2. Fat mass calculation: 80kg * 0.15 = 12kg

Therefore, your fat mass is 12kg.

Formula Summary

The formula to calculate your total fat mass is:

Fat Mass = (Body Fat Percentage / 100) * Total Weight

Variable Description Example
Body Fat Percentage (%) The percentage of your body weight that is fat. 15%
Total Weight Your total body weight in kilograms or pounds. 80 kg
Fat Mass The weight of fat in your body. 12 kg (in this case)

This calculation utilizes the provided reference which states: "Divide your percent body fat by 100 to make it a decimal. Then multiply this number by your total weight. For example, if you weigh 80kg and have learned that your body fat percentage is 15%, multiply 80 x 0.15. This is your fat mass in kilograms (800 x 0.15 = 12kg)."

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