Enter your lean body mass and body fat percentage into the calculator to estimate potential muscle growth. This calculator helps in setting realistic goals for muscle gain based on your current physique.

Muscle Growth Formula

The following formula is used to estimate muscle growth potential.

MG = LBM * (BF / 100) * 0.5

Variables:

  • MG is the estimated muscle growth (pounds)
  • LBM is the lean body mass (pounds)
  • BF is the body fat percentage (%)

To estimate muscle growth, multiply the lean body mass by the body fat percentage divided by 100, then multiply by a factor of 0.5. This factor represents an assumed efficiency of muscle gain, which can vary between individuals.

What is Muscle Growth?

Muscle growth, also known as hypertrophy, is the increase in the size of muscle cells. It typically occurs as a result of physical training, such as weightlifting, and adequate nutrition, particularly protein intake. Muscle growth is influenced by factors such as genetics, hormone levels, and training intensity.

How to Calculate Muscle Growth?

The following steps outline how to estimate muscle growth potential.


  1. First, determine your lean body mass (LBM) in pounds.
  2. Next, determine your body fat percentage (BF).
  3. Use the formula MG = LBM * (BF / 100) * 0.5 to estimate muscle growth.
  4. Finally, calculate the estimated muscle growth (MG) in pounds.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Lean Body Mass (LBM) = 150 pounds

Body Fat Percentage (BF) = 15%