Specialized Use Case

BMI Calculator for Body Composition Tracking

If you are focusing on body recomposition (building muscle while losing fat), check where your current height-to-weight ratio sits on the universal BMI chart to track physical progress.

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Interactive Console

BMI Range Chart

Standard World Health Organization (WHO) categories

Category	Range
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

Recomposition Limits: BMI doesn't account for muscle mass vs fat mass, use it alongside caliper assessments.

Patience First: Body recomposition takes time; evaluate your baseline values once every 4-6 weeks.

Hydration and Time: Weigh yourself empty first thing in the morning to maintain accurate tracking logs.