BMI Calculator
Calculate adult body mass index from height and weight locally in your browser.
BMI is a general adult reference and does not replace medical or nutrition advice.
About this tool
Calculate adult body mass index from height and weight locally in your browser.
Your height and weight values are calculated locally in your browser and are not uploaded to a server.
BMI is a general adult screening reference, not a medical diagnosis. It may be misleading for athletes, older adults, pregnancy, minors, or people with medical conditions. Consult a qualified professional for personal health decisions.
How to use it
- Enter height in centimeters.
- Enter weight in kilograms.
- Review the BMI value and adult category reference.
Common use cases
- Check a quick adult BMI reference
- Compare height and weight ranges
- Use BMI as a starting point before deeper health planning
Adult BMI Categories
BMI is a quick body-size reference based only on height and weight. It does not measure body fat, muscle mass, waist size, or health status.
| BMI range | Common adult category | Important limitation |
|---|---|---|
| Below 18.5 | Underweight | May need professional review if paired with fatigue, appetite changes, or rapid weight loss. |
| 18.5 to below 25 | Healthy range | Still does not describe body composition or metabolic health by itself. |
| 25 to below 30 | Overweight | Use waist, activity, health history, and professional guidance for context. |
| 30 and above | Obesity range | A screening signal, not a diagnosis by itself. |
FAQ
Is BMI a diagnosis?
No. BMI is a broad screening reference and cannot diagnose health status or body composition.
Does BMI work for everyone?
No. It can be less useful for athletes, pregnancy, minors, older adults, and special health conditions.
Are my measurements uploaded?
No. The calculation runs locally in your browser.