BMI Calculator
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Your BMI
Healthy Range
Healthy Weight
Note: BMI is a screening tool, not a diagnostic measure. Consult a healthcare provider for personalized advice.
How the BMI Calculator Works
Body Mass Index is calculated as weight in kilograms divided by height in meters squared (imperial inputs are converted automatically). The result is compared against the standard WHO bands — underweight, normal weight, overweight, and obese — and we also show the weight range that would put you in the "normal" band at your height.
BMI is a quick screening number, not a diagnosis — it doesn't know your body composition, only your height and weight.
Frequently Asked Questions
Is BMI accurate for everyone?
Not always. BMI doesn't distinguish muscle from fat, so it can overestimate body fat in muscular or athletic people and underestimate it in others. It's a useful general screening tool, not a full health assessment.
What are the BMI categories?
Under 18.5 is underweight, 18.5–24.9 is normal weight, 25–29.9 is overweight, and 30+ is obese.
Does BMI measure body fat directly?
No — it's a ratio of weight to height only. For a more complete picture, it's often considered alongside measurements like waist circumference or body fat percentage.