Body Mass Index (BMI) is a quick way to estimate whether someone's weight falls within a typical range for their height. It's widely used because it's simple to calculate — not because it's the most accurate measure of individual health.
How BMI Is Calculated
BMI is weight in kilograms divided by height in meters squared (kg/m²), or in imperial units, weight in pounds divided by height in inches squared, multiplied by 703. A free online calculator handles the math instantly — just enter height and weight in whichever unit system is easiest.
General BMI Ranges
- Below 18.5: underweight
- 18.5–24.9: typical range
- 25–29.9: above typical range
- 30 and above: well above typical range
Where BMI Falls Short
BMI doesn't distinguish between muscle and fat, so a muscular athlete can show a high BMI despite low body fat. It also doesn't account for age, sex, or where fat is distributed on the body — all of which affect actual health risk. It's a useful starting point for a general population, not a precise individual diagnosis.
If a BMI result is unexpected or a source of concern, it's worth discussing with a healthcare provider who can look at the full picture rather than relying on one number alone.
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