Athlete BMI Calculator
Calculate adjusted BMI for athletes that accounts for muscle mass and body fat percentage.
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Adjusted BMI Results
Standard BMI often misclassifies muscular athletes as overweight because it does not distinguish between fat and muscle.
Standard BMI formula:
- Metric:
BMI = weight (kg) / height (m)^2 - Imperial:
BMI = (weight (lbs) x 703) / height (inches)^2
Adjusted BMI uses body fat percentage to provide a more accurate assessment:
Fat Mass = Weight x (Body Fat % / 100)
Lean Mass = Weight - Fat Mass
Adjusted BMI = (Lean Mass x 1.1 + Fat Mass) / height (m)^2
Typical body fat ranges for athletes:
- Male athletes: 6–13%
- Female athletes: 14–20%
- Recreational male: 18–24%
- Recreational female: 25–31%
This calculator applies a lean-mass correction factor so that athletes with high muscle mass get a more realistic BMI reading.