Calculate your BMI (Body Mass Index) from your height and weight, and see which weight category you fall into.
Body Mass Index is your weight in kilograms divided by your height in metres squared. It's a quick screen for whether your weight is in a healthy range for your height.
BMI = weight (kg) ÷ height (m)². The standard categories are: under 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, 30+ obese.
BMI doesn't distinguish muscle from fat, so very muscular people can read as 'overweight'. Pair it with our body-fat and FFMI calculators for a fuller picture.
Not always — muscle weighs more than fat, so lifters often score high despite being lean. Use body-fat % alongside it.
For most adults, 18.5–24.9 is considered the healthy range, but it's a screening tool, not a diagnosis.
The formula and adult categories are the same; body composition differs, which is why body-fat % is a useful companion metric.