About this tool
The BMI Calculator estimates your Body Mass Index from your height and weight, in either metric or imperial units, and tells you which category you fall into along with the healthy weight range for your height. BMI is a widely used, quick screening measure, though it does not account for muscle mass, so athletes may read higher. Always treat it as a general guide, not medical advice.
How to use
- 1Select metric or imperial units.
- 2Enter your height and weight.
- 3Read your BMI, category and healthy range.
Benefits
- Metric and imperial support.
- Shows your healthy weight range.
- Instant, private calculation.
Interpret BMI with context
Practical example
BMI divides weight in kilograms by height in metres squared. Two people can have the same value while differing in muscle mass, body composition, age and health history.
Interpreting the result
The adult ranges are a population screening aid, not an individual diagnosis. Use the result as a starting point for a broader discussion of health, habits and appropriate measurements.
Limits and common mistakes
BMI is not suitable for diagnosing illness and may be misleading for children, pregnancy, older adults or very muscular people. Consult a qualified professional about health decisions.
Detailed guides for this tool
Learn the underlying concepts, worked examples and common mistakes before relying on the result.
Frequently asked questions
Is BMI accurate for everyone?+
BMI is a general screening tool and does not distinguish muscle from fat. Consult a doctor for medical advice.
What is a healthy BMI?+
A BMI between 18.5 and 24.9 is generally considered a healthy weight range.