BMI Calculator

BMI is a screening tool, not a diagnosis. It does not account for muscle mass, bone density, pregnancy, or overall health, and is not intended for children, teens, or use in eating disorder recovery.

Calculate your Body Mass Index from your height and weight.

BMI Calculator

Calculate your Body Mass Index from your height and weight.

About you

BMI is calculated for adults 18 and older.

Units
Body measurements

Your BMI result

    These estimates are for educational purposes only and are not medical advice. They are not intended for children, teens, pregnancy, eating disorder recovery, or medical conditions.

    BMI is a screening estimate for adults and does not diagnose health status or account for muscle mass, pregnancy, or medical conditions.

    Contents
    1. How to use this calculator
    2. What the result means
    3. Important limitations
    4. FAQ
    5. Is BMI an accurate measure of health?
    6. Why do I need to enter my age?
    7. Can I use imperial units?

    How to use this calculator

    Enter your age, then your height and weight. Select Metric or Imperial units first. Press Calculate to see your BMI and category.

    What the result means

    BMI is calculated as weight in kilograms divided by height in meters squared. The result is grouped into standard categories: underweight, normal weight, overweight, and obesity.

    Important limitations

    BMI does not distinguish between muscle and fat, and can be misleading for very muscular individuals, older adults, or certain body types. It is only calculated here for adults 18 and older.

    FAQ

    Is BMI an accurate measure of health?

    It’s a useful screening tool at a population level, but it doesn’t directly measure body fat or overall health for an individual.

    Why do I need to enter my age?

    BMI categories used here are intended for adults 18 and older; this calculator does not support child or teen BMI percentiles.

    Can I use imperial units?

    Yes — switch to Imperial in the calculator to enter your height in feet and inches and your weight in pounds.

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    These estimates are for educational purposes only and are not medical advice. They are not intended for children, teens, pregnancy, eating disorder recovery, or medical conditions. BMI is a screening estimate for adults and does not diagnose health status or account for muscle mass, pregnancy, or medical conditions.