Lean Body Mass Calculator - Advanced Body Composition Analysis
Calculate your lean body mass, track muscle growth, and optimize your body composition with scientific precision.
Basic Measurements
Advanced Settings
Lean Body Mass
0 kg
Fat Mass
0 kg
Fitness Assessment
Consider strength training to improve
Body Composition Analysis
Mass Distribution
Detailed Analysis
Ideal Lean Mass Range Comparison
About Ideal Ranges
Ideal ranges are based on your current weight, gender, and selected fitness level. Healthy ranges support overall wellness and metabolic health.
Related & Other Popular Calculators, Tools
Lean Body Mass (LBM) refers to the total weight of your body without the fat mass. LBM consists of muscles, bones, organs, and water - basically everything that is not fat. Knowing your LBM is very important for tracking your progress, setting reasonable goals, and improving your training and nutrition.
Our cutting-edge Lean Body Mass calculator will help you accurately get your lean body mass following multiple scientific methods. You can use this lean mass calculator for a detailed and accurate insight into your body composition and to help with your fitness decisions.

What Is Lean Body Mass?
Lean Body Mass (LBM) is everything in your body except fat tissue-muscles, bones, organs, connective tissues and water. The total body weight will not help you understand the specifics of your body composition the way figuring out your lean body mass will.
Using a reliable calculator for lean body mass will allow you to estimate your lean body mass and determine if any weight changes are due to 'fat loss' or 'muscle gain'. This is an important metric for athletes, fitness enthusiasts, and anyone trying to optimize for health in the long term.
How to use Lean Body Mass Calculator
If you want the lean body fat calculator to be as accurate as possible, use actual data on body fat percentage data, for example: DEXA scans, BodPod, or professional field caliper testing.
Why track your lean body mass?
Monitoring your lean body mass consistently allows for real progress to happen to your training, nutrition, and recovery process.
Advantages of having higher lean body mass
With the Lean Body Mass Calculator - you will be able to track lean body mass improvements overtime and stay on track during your fitness journey.
How to increase your lean body mass
Increasing your lean body mass requires consistency with your training & nutrition:
With patience and consistency, most individuals can gain 0.5-1 kg (1-2 lbs) of lean mass monthly through structured effort.
Understanding Different Calculation Methods
Boer Formula
Most accurate for general population. Uses weight and height with gender-specific coefficients.
Body Fat Method
Most precise when actual body fat percentage is known. Direct calculation: LBM = Total Weight x (1 - Body Fat %)
James & Hume Formulas
Alternative estimation models that help you estimate lean body mass effectively based on varying body types.
Empower your transformation with the SantProTools Lean Body Mass Calculator. Whether you'd like to calculate lean body mass, build lean muscle, or analyze your composition entirely - the Lean Body Fat Calculator will make calculating your progression manageable.
Use the lean body mass calculator routinely to evaluate your progression, and make data informed decisions for health, strength and longevity.
FAQs
Lean Body Mass is everything in the body, except fat - muscles, bones, organs, and water, etc. Our lean body mass calculator helps you calculate it easily.
While muscle mass forms part of LBM, lean body mass may also involve bones, organs, and body fluids. You can accurately determine lean body mass utilizing the lean mass calculator.
The body fat lean mass calculator option using actual fat percentage (DEXA, BodPod, calipers) provides the best accuracy. Among formulas, the Boer equation works best for most people.
Using a calculator for lean body mass (LBM) helps you see whether weight changes come from 'fat loss' or 'muscle gain' - vital for achieving a toned, healthy physique.
100%! With strength training, good nutrition, and rest, you can measure the changes in lean body mass and steadily increase muscle over time!
Every 4-6 weeks is best to measure your LBM so you can be accurate when measuring a new progress point, and adjust your new goals for each.