BMI Calculator – Body Mass Index (Free Online, Metric & Imperial)

Use this fast BMI Calculator to check your Body Mass Index using metric (kg/cm) or imperial (lb/ft/in). Get your BMI score, weight category, and a healthy weight range for your height. Private and instant—everything runs in your browser.

Calculate Your BMI

Units: Metric (kg, cm) Imperial (lb, ft, in)

Weight (kg)

Height (cm)

Weight (lb)

Height (ft)

Height (in)

Your BMI:

Category:

Healthy Weight Range for your height:

Note: BMI is a simple screening tool. It doesn’t account for muscle mass, bone density, or body fat distribution. For medical advice, talk to a healthcare professional.

What Is BMI (Body Mass Index)?

Body Mass Index (BMI) is a simple health indicator that compares your weight to your height. It is calculated as weight divided by height squared (kg/m²). BMI helps classify weight status: Underweight, Normal, Overweight, and Obesity.

BMI Categories

• Underweight: < 18.5
• Normal weight: 18.5 – 24.9
• Overweight: 25 – 29.9
• Obesity: ≥ 30

How to Use the BMI Calculator

1. Choose your Units: Metric (kg, cm) or Imperial (lb, ft, in).
2. Enter your weight and height.
3. Click Calculate BMI to see your score, category, and healthy weight range.

FAQ – BMI Calculator

Is BMI accurate for everyone?

BMI is a screening tool. It does not distinguish between muscle and fat and may not reflect body composition in athletes, seniors, or some populations.

What is a healthy BMI range?

For adults, a BMI between 18.5 and 24.9 is generally considered healthy.

Can I use BMI for children?

Child and teen BMI uses age- and sex-specific percentiles. This calculator is intended for adults.

Do you store my information?

No. All calculations happen in your browser and are not saved or uploaded.

Conclusion

Use this free BMI Calculator to quickly find your BMI, weight category, and the healthy weight range for your height. Switch between metric and imperial units easily and get instant, private results.