This FFMI calculator relates estimated fat-free mass to height. It also shows normalized FFMI and fat-free mass, using the body fat percentage you enter.
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Enter height and weight to calculate.
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Enter age (18 or older), height, weight and body fat percentage
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Enter age (18 or older), height, weight and body fat percentage
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Enter age (18 or older), weight and body fat percentage
In older age, muscle mass and general condition matter when interpreting BMI. Winter et al. (2014) describe limitations of the usual BMI interpretation in older adults. Winter et al., 2014. BMI by age
This calculator gives general reference values and does not replace advice from a doctor. For children and teens under 18, during pregnancy and breastfeeding, for very muscular builds and in older age, the results are of limited use.
Fat-free mass = weight × (1 minus body fat share). FFMI is fat-free mass divided by height in metres squared.
Normalised FFMI adjusts the value to 1.80 m: FFMI + 6.3 × (1.8 minus height in m), after Kouri and colleagues (1995).
FFMI is only as good as your body fat estimate. A few percentage points either way shift it noticeably, so compare your own readings over time, taken with the same method.
This calculator gives general reference values and does not replace advice from a doctor. For children and teens under 18, during pregnancy and breastfeeding, for very muscular builds and in older age, the results are of limited use.