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Specialized Use Case

BMI Calculator for Athletes & Muscle Mass

Body Mass Index (BMI) does not distinguish between lean skeletal muscle mass and body fat. Calculate your BMI score while learning how to interpret results as an active athlete.

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Interactive Console

BMI Range Chart

Standard World Health Organization (WHO) categories

CategoryRange
Underweight		< 18.5
Normal weight		18.5 – 24.9
Overweight		25.0 – 29.9
Obese Class I		30.0 – 34.9
Obese Class II		35.0 – 39.9
Obese Class III		≥ 40.0

This chart applies to adults aged 20 years and older. For children and teens, BMI is interpreted differently using age and sex-specific percentiles.

Did you know?

Maintaining a healthy weight is important for overall health. In addition to BMI, healthcare providers use other measurements and factors - such as skinfold thickness, waist circumference, and diet - to assess a person’s health status.

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Professional Tips & Best Practices

1

Muscle Bias: Dense muscle weighs more than fat, often pushing athletic individuals into overweight brackets.

2

Alternative Metrics: Supplement BMI with waist-to-height ratios or body fat skinfold measurements.

3

Clinical Context: Utilize findings to discuss body composition goals with sports nutritionists.