BMI Calculator
Calculate your Body Mass Index (BMI) and see which standard adult category it falls into.
This is a general screening calculation, not a diagnosis. BMI doesn't account for muscle mass, bone density, or overall body composition. Categories reflect standard CDC/WHO thresholds for adults — talk to a healthcare provider for guidance specific to you.
Calculated locally. Your numbers never leave your browser.
Common questions
Is BMI accurate for everyone?
No. BMI only relates weight to height — it can't distinguish muscle from fat, so it often misreads athletes and very muscular people as "overweight," and can miss excess body fat in people with lower muscle mass, including many older adults. It's a quick population-level screening measure, not an individual diagnosis.
What do the categories mean?
Kelvido uses the standard adult thresholds published by the CDC: under 18.5 is Underweight, 18.5–24.9 is Healthy weight, 25–29.9 is Overweight, and 30 or above is Obesity. These ranges are for adults and are not adjusted for age, sex, or body composition.
Is this medical advice?
No — this is an informational calculation, not a diagnosis or medical advice. If a result concerns you, or you want guidance specific to your body, talk to a healthcare provider rather than relying on BMI alone.