BMI Calculator

Body Mass Index calculator for quick weight category checks

This BMI Calculator estimates your Body Mass Index based on your weight and height and shows which weight category you fall into. You can switch between metric units (kilograms and centimeters) and imperial units (pounds, feet and inches).

Enter your current weight and height, choose the correct measurement system, and select “Calculate BMI”. The tool will display your BMI value, the matching category, and a suggested healthy weight range for your height.

BMI is a screening tool, not a diagnosis. It is commonly used by health professionals to quickly assess whether an adult may be underweight, within a healthy weight range, overweight, or living with obesity.

Assumptions and how to use this calculator

• This calculator is intended for adults aged 18 and over.
• BMI categories follow standard World Health Organization ranges: underweight, normal weight, overweight and obesity.
• Healthy weight range is calculated using a BMI range of 18.5 to 24.9 for your entered height.
• Results may be less accurate for very muscular people, pregnant women, or those with certain medical conditions.
• Use the result as a starting point for discussion with a qualified health professional, not as a final diagnosis.

Common questions

What is BMI and why does it matter?

Body Mass Index (BMI) is a simple ratio of your weight to your height. It gives a rough indication of whether your weight is in a range that is typically associated with lower health risk for most adults.

What BMI range is considered healthy?

For most adults, a BMI between 18.5 and 24.9 is often considered a healthy range. This calculator also converts that range into a suggested healthy weight span for your specific height.

Is BMI accurate for athletes or very muscular people?

BMI does not distinguish between muscle and fat. Very muscular people can show a high BMI even when their body fat is low. In those cases, body composition measurements are more useful.

Can I use this BMI calculator for children or teens?

No. For children and teenagers, BMI needs to be interpreted using age- and sex-specific growth charts. Speak to a doctor or health professional for the correct approach.

What should I do if my BMI is outside the healthy range?

If your BMI falls outside the typical healthy range, consider discussing it with a doctor, dietitian or other health professional. They can help interpret the result in context and suggest realistic steps if any changes are needed.