# Lean Body Mass Calculation Error

Here's the calculation for lean body mass that every other calculator uses:

I'm going to use the example of a 240 pound person with BMI of 43.

Step 1
Weigh yourself with a body fat scale. The scale will automatically calculate your percentage of body fat. (Body fat % = 43)

Step 2
Subtract your body fat percentage from 100 to get your lean mass percentage. (Lean mass PERCENTAGE = 100-43 = 57)

Step 3
Divide your lean mass percent by 100 to calculate the decimal for your lean mass percent.
(This just gets you to 0.57.)

Step 4
Multiply your lean mass decimal by your total body weight to calculate your lean mass weight. (240 lbs x 0.57 = 136.8 lbs. of lean mass)

Step 5
Multiply the LEAN MASS, NOT THE LEAN MASS PERCENTAGE by 0.8. (136.8 lbs * 0.8 = 110 g/lb)

Your calculator is stopping at Step 2. You're multiplying the lean mass PERCENTAGE, not the actual LEAN MASS VALUE.

Also, in many of the responses on this discussion board, I have seen your experts say we need between 0.8 g - 1 g per Kg. That is not right. It's 2.2g/Kg of lean BW. 0.8 - 1g PER lb.

1 gram of protein per pound of body weight (2.2 g/kg of BW) per day has been a bodybuilding rule of thumb for decades. Higher levels of protein intake, usually in the range of 1.2 – 1.5 grams per pound of body weight (2.6 – 3.3 g/kg BW) per day, are commonly recommended when “cutting” to lose fat.

This really needs to be addressed. There's a HUGE difference between what your calculation would show for that person and what they really need to be shooting for - 45.6 g vs 110 g. You've more than halved the protein they need. I'm sure it's more extreme, the larger a person is...

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