To determine the percentage of body fat lost, you must first determine your initial body fat. You can use underwater weighing, body circumference measurements or skinfold measurements to determine your body fat. After determining your initial body fat percentage, perform recheck your body fat percentage after performing your workout routine or weight loss routine for at least a month. Body fat amounts take longer to change than weight alone. Once you know your old body fat and new body fat, you can determine your percentage of body fat lost by performing a simple calculation.
Step 1
Divide you new percentage of body fat by your initial body fat. For example, if your body fat was 28 percent beforebeginning your workout or weight loss regimen, and your new body fat is 24 percent, your equation will look like this: 24 / 28 = 0.857.
Step 2
Subtract one from your answer to Step 1. For example, if your answer was 0.857, your equation will look like this: 0.857 - 1 = -0.143
Step 3
Multiply your answer to Step 2 by 100. If your answer was -0.143, your equation will look like this: -0.143 X 100 = -14.3 percent. You have lost 14.3 percent of your body fat.
Tips and Warnings
- After subtracting one from your answer to step 3, the number is a negative, you have lost body fat. If your answer is a positive, you have increased your body fat. Write out each step so you do not confuse any of your numbers. Have a professional trainer determine your body fat percentages to ensure the accuracy of your percentage.
- Verify your trainer is certified--this will ensure your safety and the accuracy of the information and methods. Consult a physician before engaging in any new exercise or weigh-loss regimen.
References
- "Essentials of Strength Training and Conditioning"; National Strength and Conditioning Association; 2000
- "Personal Trainer Manual"; American Council on Exercise; 1997
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