BMI Calculator
Body Mass Index from your height and weight. The most widely known metric, framed with honest metabolic context.
Your details
What this means
What to consider
Medications that may affect your result
Corticosteroids (prednisone, dexamethasone) can cause significant weight gain, particularly central fat accumulation, which directly raises BMI.
Diuretics (furosemide, hydrochlorothiazide) reduce water weight, which may temporarily lower BMI without reflecting actual body composition changes.
Your baseline may differ from the general population. Discuss with your healthcare provider.
About this tool
Formula
BMI = weight (kg) / height (m)². Standard WHO formula.
Thresholds
General: below 18.5 / 18.5–24.9 / 25.0–29.9 / 30.0+
Asian/South Asian: increased risk at 23.0, elevated at 27.5 (WHO).
Limitations
Does not distinguish muscle from fat. Less accurate for older adults, muscular individuals, and those with physical disabilities or edema. Developed on predominantly European data. Does not account for fat distribution.
Sources
WHO Global BMI Classification (2000). WHO Expert Consultation on Asian Populations (2004).
Educational tool only. Not for diagnostic purposes. Consult a healthcare provider for medical decisions.