BMI Calculator
Calculate your Body Mass Index
Enter your measurements and click calculate
to see your BMI results
How to Use This Tool
- Select your unit system: metric (kilograms and centimetres) or imperial (pounds and inches).
- Enter your height in the height field.
- Enter your current weight in the weight field.
- Your BMI score and weight category (underweight, normal, overweight, or obese) are displayed instantly.
Common Use Cases
- Getting a quick health screening number during a routine self-assessment.
- Tracking weight-loss or muscle-gain progress over weeks or months.
- Understanding where your weight falls relative to healthy ranges before a doctor's appointment.
- Checking whether a weight goal puts you in a healthy BMI range before committing to a diet or training plan.
- Healthcare students learning to calculate and interpret BMI for patient records.
Frequently Asked Questions
What is a healthy BMI range?
According to the World Health Organization, a BMI between 18.5 and 24.9 is considered healthy for most adults. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is classified as obese.
Is BMI an accurate measure of health?
BMI is a useful screening tool but has limitations. It does not distinguish between fat mass and muscle mass, so highly muscular individuals often have a high BMI despite being very lean. Always consult a healthcare professional for a complete health assessment.
Does BMI work the same for children?
No. For children and teenagers, BMI is interpreted differently using age- and sex-specific BMI-for-age percentile charts, since body fat levels change naturally as children grow.
Is my data stored or sent anywhere?
No. The BMI calculator works entirely in your browser. Your height and weight values are never transmitted to any server.