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Use this bmi calculator for a clear health & fitness estimate. Results update instantly in your browser.
What this calculator does
Calculate body mass index from height and weight using adult reference categories.
How to use this calculator
- Enter weight, height, and age.
- Review the calculation assumptions before using the result.
- BMI is a screening number, not a diagnosis.
How to calculate
BMI = weight (kg) ÷ height² (m).
Enter the values requested by the bmi calculator.
Worked example
Use the default values as a worked example, then replace them with your own figures.
Understanding your result
BMI is a screening number, not a diagnosis.
- Muscle mass and health history can make BMI less useful.
- Double-check values and units before calculating.
This calculator is educational and is not financial or medical advice.
Frequently asked questions
What does this bmi calculator do?
Calculate body mass index from height and weight using adult reference categories.
How do I use this bmi calculator?
Enter weight, height, and age.
What does the result mean?
BMI is a screening number, not a diagnosis.
What should I check before relying on it?
Muscle mass and health history can make BMI less useful.