Body Mass Index, or BMI, is an estimate of your body fat, based on your height and weight. It is a convenient screening tool that can help identify individuals at risk for certain health conditions. A high BMI places you at higher risk of developing conditions like heart disease, high blood pressure, sleep apnea and type 2 diabetes. If your BMI falls outside the normal range, your doctor may use additional tests to assess your body fat and overall health. These may include skin fold thickness measurements, evaluations of your diet and activity level and your family history.
Calculate Your BMI
Step 1
Weigh yourself on the scale.
Step 2
Measure your height in inches with the measuring stick or tape measure.
Step 3
Calculate your body mass index. Divide your weight in pounds by your height in inches squared, and multiply by 703.
Interpret Your Result
Step 1
Discuss a BMI below 18.5 with your doctor. A BMI below 18.5 places you in the underweight category. In some cases, low BMI indicates malnutrition or an underlying health condition.
Step 2
Consider your BMI normal if it is between 18.5 and 24.9. Your body fat is likely in the healthy range, however your doctor can perform a more accurate assessment of your health based on your individual lifestyle and family history.
Step 3
Discuss a BMI of 25.0 to 29.9 with your doctor. A BMI in this range is considered overweight. If you have additional risk factors, you may benefit from a weight loss plan.
Step 4
Discuss a BMI higher than 30.0 with your doctor, as this is in the obese range. Your doctor will determine whether you should start a weight loss plan.
Things You'll Need
- Scale
- Tape measure or measuring stick
- Calculator
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