How to Calculate Your Body Mass Index (BMI)

Knowing your body mass index (BMI) is important in maintaining a healthy weight. Your BMI can help you determine whether you are underweight, normal weight, overweight, or obese. Here’s how you can calculate your BMI:

Step 1: Measure Your Weight

Measuring WeightSource:

Before you calculate your BMI, you need to know your weight in kilograms or pounds. To measure your weight, stand on a scale and record the number that appears.

Step 2: Measure Your Height

Measuring HeightSource:

You also need to know your height in meters or feet and inches. To measure your height, stand up straight against a wall and use a tape measure to record your height from the floor to the top of your head.

Step 3: Calculate Your BMI

Bmi FormulaSource:

Once you have your weight and height measurements, you can calculate your BMI using the following formula:

BMI = weight (kg) ÷ height² (m²)

If you have your weight in pounds and your height in feet and inches, you can use this slightly different formula:

BMI = (weight (lbs) ÷ height² (in²)) x 703

For example, if you weigh 68 kilograms and are 1.75 meters tall, your BMI would be:

BMI = 68 ÷ (1.75 x 1.75) = 22.2

If you weigh 150 pounds and are 5 feet 6 inches tall, your BMI would be:

BMI = (150 ÷ (66 x 66)) x 703 = 24.2

Step 4: Interpret Your BMI

Bmi CategoriesSource:

Now that you have calculated your BMI, you can use the following categories to interpret your results:

  • Underweight: BMI below 18.5
  • Normal weight: BMI between 18.5 and 24.9
  • Overweight: BMI between 25 and 29.9
  • Obese: BMI 30 or higher

If your BMI falls outside the normal weight range, talk to your doctor about developing a plan to achieve a healthier weight.

Factors that Affect BMI

Factors Affecting BmiSource:

It’s important to note that BMI is not a perfect measure of health. There are several factors that can affect your BMI, including:

  • Muscle mass: Because muscle weighs more than fat, athletes and bodybuilders may have a higher BMI despite being in good health.
  • Age: In general, older adults tend to have a higher BMI than younger adults, even if they have the same amount of body fat.
  • Gender: Women tend to have a higher percentage of body fat than men, which can affect their BMI.
  • Height: Tall people may have a lower BMI than shorter people, even if they have the same amount of body fat.

Despite these limitations, BMI is a useful tool for monitoring your weight and overall health. By knowing your BMI, you can make more informed decisions about your diet and exercise habits.


Calculating your BMI is a straightforward process that can give you important insights into your health. By following the steps outlined above, you can determine your BMI and use it as a guide for maintaining a healthy weight. Remember to consult with your doctor if you have any concerns about your BMI or overall health.

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *