Health screening tool
BMI Calculator
Quick answer: This BMI calculator helps adults estimate body mass index, weight category, and a general healthy weight range from height and weight.
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Use this BMI calculator to estimate body mass index from your height and weight in either imperial or metric units. You’ll see your BMI number, your category, and the healthy weight range for your height in seconds.
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Check your BMI and weight range
Switch units any time. The result updates live and includes a quick category label for adults.
BMI is a screening tool, not a diagnosis. It does not directly measure body fat, muscle mass, or overall health, so it should be interpreted alongside other health information.
How this BMI calculator works
BMI compares your weight to your height using a standard formula. In imperial units, the calculator uses pounds and inches, while in metric units it converts centimeters and kilograms into the same body mass index scale used for adults.
Once the BMI number is calculated, it is grouped into one of the common adult screening categories: underweight, normal, overweight, or obese. That category helps you interpret the number quickly, but it is still only one part of the picture.
The healthy weight range is based on the BMI range of 18.5 to 24.9 for your current height. It gives you a useful reference point, especially if you want a rough benchmark before talking through the bigger health picture with a clinician or coach.
Frequently Asked Questions
For adults, a BMI between 18.5 and 24.9 is usually considered the normal range. This is a general screening range, not a diagnosis.
Not always. People with high muscle mass can land in a higher BMI category even if they have low body fat.
No. It is more useful when combined with waist measurements, activity level, lab work, and guidance from a healthcare professional.
It is the weight range that would place you in the BMI range of 18.5 to 24.9 for your current height.