BMI Calculator
Find your Body Mass Index in seconds, plus the healthy weight band for your height.
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BMI, Briefly Explained
Body Mass Index (BMI) uses just two numbers — your height and your weight — to estimate where you sit relative to a healthy weight range. It's the quick screening measure health professionals reach for first.
The calculation
The formula is weight (kg) divided by height (m) squared — kg/m². Results from 18.5 to 24.9 are generally read as a healthy weight; 25 to 29.9 counts as overweight, and 30 upwards as obese.
Where BMI falls short
BMI is a rule of thumb, not a medical verdict. The calculation ignores muscle mass, body composition, age and ethnicity, so someone very muscular can register as "overweight" while carrying little fat. Treat the figure as a starting point and seek professional advice for anything tailored.