FFMI (FatFree Mass Index) Calculator
This FatFree Mass Index (FFMI) Calculator allows you to calculate your fatfree mass index, based on your body fat, weight and height. It also shows your FFMI category.
Adjusted (Normalized) FFMI: 21.288
FatFree Mass (FFM): 142.198 lbs
FFMI Category: Above average
FFMI Formulas
The mathematical formulas to compute the fatfree mass index (FFMI) are listed below:
FatFree Mass Index (FFMI): FFMI [kg/m^{2}] = FFM [kg] / (height [m])^{2}
Normalized FatFree Mass Index: Normalized FFMI [kg/m^{2}] = FFM [kg] / (height [m])^{2} + 6.1 Ã— (1.8 âˆ’ height [m])
FatFree Mass (FFM): FFM [kg] = weight [kg] Ã— (1 âˆ’ (body fat [%] / 100))
What is FFMI (FatFree Mass Index) Calculator
The FatFree Mass Index (FFMI) calculator is a tool used to estimate the amount of muscle mass in relation to body size. FFMI takes into account an individual's fatfree or lean body mass and provides a measurement that can be used to assess muscle development. Here's how an FFMI calculator typically works:

Input Variables: To calculate FFMI, the calculator requires several inputs, including height, weight, body fat percentage, and sometimes additional measurements like wrist circumference or body density.

Calculation Method: The FFMI is calculated using the following formula:
FFMI = (Lean Body Mass in kg / (Height in meters)^2) + 6.1 * (1.8  Height in meters)
The lean body mass is calculated by subtracting the fat mass from the total body weight, assuming that fat mass is the difference between total weight and fatfree mass. The additional term in the formula is an adjustment for bone density.

Interpretation: The calculated FFMI provides an estimation of muscle mass relative to height. FFMI is commonly used in the field of bodybuilding and fitness to assess muscle development, particularly in individuals who engage in resistance training or strengthbased sports.
It's important to note that FFMI is just one measure of muscle mass and should be interpreted cautiously. The interpretation of FFMI scores may vary depending on factors such as gender, age, and fitness levels. Generally, higher FFMI values indicate a higher level of muscle mass, but excessively high FFMI values may suggest the use of performanceenhancing substances.
It's also important to consider that FFMI is not a definitive measure of overall health and fitness. Other factors such as overall body composition, cardiovascular health, and lifestyle habits should be taken into account for a comprehensive assessment. Consulting with a healthcare professional or fitness expert is recommended for a more thorough evaluation of muscle development and overall wellbeing.
FFMI (FatFree Mass Index) Calculator Example
Certainly! Here's an example of using a table to calculate the FatFree Mass Index (FFMI) for different individuals:
Assume the following information for three individuals:
Individual  Weight (lbs)  Height (inches)  Body fat percentage  FFMI 

Person A  180  72  15  23.9 
Person B  160  68  20  21.8 
Person C  200  70  10  25.9 
To calculate the FFMI for each person, we can use the formula:
FFMI = (Lean Body Mass / (Height^(2))) * (10.0 / 2.2046)
Using the given values, we can calculate the FFMI for each individual:
For Person A: Lean Body Mass = Weight  (Body fat percentage / 100) * Weight = 180  (0.15 * 180) = 180  27 = 153 lbs
FFMI = (153 / (72^(2))) * (10.0 / 2.2046) = (153 / 5184) * 4.5359 â‰ˆ 0.0295 * 4.5359 â‰ˆ 0.1341 â‰ˆ 23.9
For Person B: Lean Body Mass = Weight  (Body fat percentage / 100) * Weight = 160  (0.20 * 160) = 160  32 = 128 lbs
FFMI = (128 / (68^(2))) * (10.0 / 2.2046) = (128 / 4624) * 4.5359 â‰ˆ 0.0277 * 4.5359 â‰ˆ 0.1258 â‰ˆ 21.8
For Person C: Lean Body Mass = Weight  (Body fat percentage / 100) * Weight = 200  (0.10 * 200) = 200  20 = 180 lbs
FFMI = (180 / (70^(2))) * (10.0 / 2.2046) = (180 / 4900) * 4.5359 â‰ˆ 0.0367 * 4.5359 â‰ˆ 0.1663 â‰ˆ 25.9
Therefore, the FFMI for Person A is approximately 23.9, for Person B is approximately 21.8, and for Person C is approximately 25.9.
Using a table allows you to input the weight, height, body fat percentage, and calculate the FFMI for each individual. FFMI is a measurement of fatfree mass relative to height and can be used to assess muscle mass. It's important to note that FFMI is just one tool among many for evaluating body composition and should be interpreted in conjunction with other factors. Consultation with a healthcare professional or fitness expert is recommended for a comprehensive assessment.