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BMI Calculator
Calculate body mass index in metric or imperial units and review the matching BMI category and scale.
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BMI is a screening tool and does not diagnose health conditions.
Body mass index
22.9
Under 18.5 18.5–24.9 25–29.9 30+
BMI categories
Reference table| Category | BMI range |
|---|---|
| Underweight | Below 18.5 |
| Normal weight | 18.5 to 24.9 |
| Overweight | 25 to 29.9 |
| Obese | 30 and above |
BMI is a screening tool and does not diagnose health conditions.
How to use
How to calculate BMI in metric or imperial units and understand the result
- 1 Choose metric mode if you want to enter weight in kilograms and height in centimeters, or imperial mode for pounds and feet plus inches.
- 2 Enter your weight and height values as accurately as possible, then calculate to generate the BMI result.
- 3 Review the BMI number and the matching category label such as underweight, normal weight, overweight, or obese.
- 4 Use the visual scale to see where the result sits across the common BMI ranges at a glance.
- 5 Check the category reference table and remember that BMI is a screening tool, not a diagnosis on its own.
BMI calculators offer a quick screening estimate based on the relationship between weight and height. Because the formula is simple, it is commonly used for personal tracking, classroom examples, and general health discussions. Switching between metric and imperial units makes the tool more practical for people in different regions or for anyone comparing measurements from different sources.
The category label and visual scale help turn the number into something easier to interpret. Still, BMI does not account for every factor that affects health, such as body composition, age, or muscle mass. That is why the tool is best used as a general reference point rather than a complete assessment, especially when any personal medical questions are involved.
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