Lean Body Mass Calculator
Formula | Lean Body Mass | Body Fat |
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What is Lean Body Mass?
- Definition:
- Lean body mass (LBM) represents the weight of your body if it were completely devoid of any body fat.
- This includes organs, bones, muscles, blood, skin, and everything else that has mass and is not fat.
- Importance in Weight Loss:
- Monitoring Muscle Loss: Monitoring your LBM is crucial when trying to lose weight. It helps you track how much muscle you might be losing.
- Dietary Impact: Solely losing muscle can lead to disappointing results and an unpleasant appearance.
- Decision Making: Understanding your LBM aids in determining how much fat you should lose and projecting your body fat percentage after weight loss.
- Accuracy Over Body Weight:
- Calculating your LBM provides a more accurate assessment of your physical composition than just considering overall body weight.
Lean Body Mass Formulas for Adults
The Boer Formula:1
For males: |
eLBM = 0.407W + 0.267H – 19.2 |
For females: |
eLBM = 0.252W + 0.473H – 48.3 |
The James Formula:2
For males: |
eLBM = 1.1W – 128(W/H)^2 |
For females: |
eLBM = 1.07W – 148(W/H)^2 |
The Hume Formula:3
For males: |
eLBM = 0.32810W + 0.33929H – 29.5336 |
For females: |
eLBM = 0.29569W + 0.41813H – 43.2933 |
Lean Body Mass Formula for Children
The Peters Formula:4
The author suggests that this formula is applicable for children aged 13-14 years old or younger. The formula is used to compute an eLBM based on an estimated extracellular volume (eECV) as follows:
eECV = 0.0215·W0.6469·H0.7236 |
eLBM = 3.8·eECV |
In the formulas above, W is the body weight in kilogram and H is the body height in centimeter.
Lean Body Mass vs. Fat Free Mass
Aspect | Lean Body Mass | Fat-Free Mass |
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Definition | Lean body mass includes the combined mass of bones, muscles, water, ligaments, tendons, and internal organs. | Fat-free mass is the total body mass minus all fat mass, including essential fat. |
Components | Lean Body Mass includes: Bones, Muscles, Water, Ligaments, Tendons, Internal organs (along with some essential fat) | Fat-Free Mass consists of: All components of Lean Body Mass, Excludes any kind of fat, including essential fat |
Essential Fat | Includes the mass of essential fat found in internal organs. | Does not include the mass of essential fat. |
Subcutaneous Fat | Does not include surrounding subcutaneous fat of internal organs. | Excludes subcutaneous fat as well as essential fat. |
Measurement | Measured by including the essential fat found in internal organs. | Measured by subtracting all fat mass, including essential fat, from total body mass. |
Difference in Mass | Slightly higher due to the inclusion of essential fat. | Slightly lower when compared to lean body mass, as it excludes essential fat. |
Percentage Difference | Approximately 2-3% higher in men and 5-12% higher in women when compared to fat-free mass, due to the inclusion of essential fat in internal organs. | – |