BMI Calculator
Enter your height and weight to get your Body Mass Index and WHO weight category instantly. All calculation happens on your device.
How to calculate BMI
- Choose metric or imperial units to match your measurements.
- Enter your height and weight in the boxes.
- Your BMI and weight category update instantly as you type.
- Use the result as a general health screening guide.
FAQs
What is BMI?
Body Mass Index (BMI) is a number calculated from your height and weight, used as a quick estimate of whether you are underweight, normal, overweight or obese.
What do the BMI categories mean?
A BMI below 18.5 is underweight, 18.5-24.9 is normal, 25-29.9 is overweight, and 30 or above is obese, following the World Health Organization ranges.
Does my data leave my device?
No. All calculation happens in your browser, so your height and weight are never uploaded or stored anywhere.
Is BMI a medical diagnosis?
No. BMI is a general screening metric for adults and does not account for muscle mass, age or body composition. Always consult a health professional for medical advice.
Related Tools
Why use a BMI calculator?
Use the BMI Calculator to quickly estimate your weight category from your height and weight, so you can track general health trends without doing the math by hand.
- Get an instant estimate of your weight category without manual calculations.
- Compare your result against the standard WHO ranges used by health professionals.
- Switch between metric and imperial units to match whatever measurements you have.
Tips and Limits
BMI is a screening metric, not a medical diagnosis. It does not distinguish muscle from fat and may be less accurate for athletes, older adults or children. Always talk to a healthcare professional for personalized advice.