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Body Mass Index compares your weight against your height and puts the result in one of four bands. It is the fastest way to see roughly where you sit, and it is where most coaches start a first conversation about body composition.
BMI is your weight in kilograms divided by your height in metres squared. The four bands below come from the World Health Organization's classification for adults, and are the same everywhere the index is used.
| Band | BMI |
|---|---|
| Underweight | Below 18.5 |
| Normal weight | 18.5 – 25 |
| Overweight | 25 – 30 |
| Obese | 30 and above |
BMI is an estimate for adults at a population level. It cannot tell muscle from fat, so a trained lifter often reads high; it is not a diagnosis and it does not replace medical advice.