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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
Enter the values requested by the bmi calculator.
Worked example
With the example values shown above, the BMI is 22.9, and the category is Healthy range, and the healthy BMI range is 18.5–24.9.
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.
Is BMI accurate for athletes or very muscular people?
Not reliably — BMI can't distinguish muscle from fat, so a muscular, low-body-fat person can land in the 'overweight' category despite being in good metabolic health.
Why does my BMI category matter?
BMI categories are a population-level screening tool correlated with health risk on average, not an individual diagnosis. A result outside the healthy range is a prompt to look closer, not a verdict on your health.
What's a good complement to BMI?
Waist circumference, waist-to-height ratio, or a body-fat percentage estimate can add context BMI alone doesn't capture, since they say more about where and how much fat is carried.