Enter your Gender, Body Weight, Height, and optionally your Body Fat Percentage, then choose a Calculation Method to find your Lean Body Mass — plus your Fat Mass, LBM Percentage, and Fat Percentage broken out alongside it.
Lean Body Mass
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Fat Mass
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LBM Percentage
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Fat Percentage
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Lean body mass (LBM) is your total body weight minus your fat mass. It includes all body components except fat - muscles, bones, organs, blood, skin, and water. LBM typically ranges from 60-90% of total body weight.
LBM can be calculated using body fat percentage (LBM = Weight × (1 - Body Fat %/100)) or empirical formulas like Boer, James, or Hume that use height, weight, and gender to estimate lean mass.
The body fat percentage method is most accurate if you know your body fat %. Among prediction formulas, Boer (1984) is widely used and reliable. James and Hume formulas provide alternative estimates for comparison.
Yes, 79% LBM (21% body fat) is generally healthy for most adults. Healthy body fat ranges are typically 10-20% for men and 18-28% for women, making 79% LBM a good target.
LBM indicates your metabolically active tissue and muscle mass. Higher LBM means better metabolism, strength, and overall health. It's useful for tracking fitness progress and determining proper medication dosages.
Yes, through resistance training and adequate protein intake, you can increase muscle mass, which is a major component of LBM. Strength training stimulates muscle growth while proper nutrition supports muscle protein synthesis.
Yes, men typically have higher LBM percentages than women due to greater muscle mass and bone density. This is why gender-specific formulas are used for LBM calculations.