BMI Calculator
Estimate adult Body Mass Index from height and weight — in your browser.
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Tool workspace
Educational adult BMI estimate only — not medical advice. Adult WHO-style categories. Runs locally in your browser; measurements are not uploaded.
How it works
Metric BMI = weight (kg) ÷ height (m)². Imperial BMI = 703 × weight (lb) ÷ height (in)².
Adult WHO-style categories: underweight under 18.5; healthy weight 18.5–24.9; overweight 25.0–29.9; obesity 30 or above. BMI rounds to one decimal place.
Results update as you type. Empty incomplete inputs clear the result—no error. Out-of-range values show a validation message.
Disclaimer: educational adult estimates only — not medical, clinical, or weight-loss advice. Not for children or adolescents.
Examples
- 175 cm, 70 kg → BMI 22.9 · Healthy weight
- Same person in imperial: 69 in, 154 lb → BMI about 22.7 · Healthy weight
Privacy
FAQ
Is this medical advice?
No. Results are educational adult BMI estimates only and are not medical or clinical advice.
Are my measurements uploaded?
No. Calculation runs entirely in your browser. We do not log what you enter.
Do these categories apply to children?
No. This tool uses adult WHO-style cutoffs only. Child and adolescent BMI uses age- and sex-specific percentiles, which are out of scope here.
Do I need an account?
No. All published tools work for guests without login.