BMI Calculator Metric Units

What is BMI?

The body mass index, or BMI, is a weight-to-height ratio. It is expressed in kilograms per square meter or pounds per square inch of height. BMI numbers correspond to weight categories such as underweight, normal, overweight, and obese.

The BMI is used to determine a person’s overall health. The Centers for Disease Control (CDC) and the World Health Organization (WHO) both acknowledge that people who are overweight or underweight are more likely to develop certain health problems. BMI also allows health practitioners to objectively address body weight with their patients.


What Is the Formula for Calculating Bmi in Metric Units?

To calculate BMI, divide your weight in kilograms by your height squared. Weight in kilograms divided by height in centimeters squared, multiplied by 10,000, can be used as an alternative calculation formula because height is frequently measured in centimeters.

BMI Formula

Metric units: BMI = weight (kg) ÷ height2 (meters)

How to Calculate BMI

Using the metric system, where weight is measured in kilograms and height in meters, divide the weight by the square of the height.

Calculate BMI in metric units:

Someone weighs 60 kg and is 1.8 meters tall. What is his BMI?

  • Divide 60 by 1.80
  • BMI = (WeightKG) ÷ (HeightM)2
  • BMI = 60 ÷ (1.80)2
  • BMI = 60 ÷ 3.24
  • BMI = 18.51

BMI Chart (CDC)

Understanding Your BMI Score


Being underweight could indicate that you are not eating enough or that you are ill. A doctor can assist you if you are underweight.

Healthy weight

Continue your excellent work! Check out the food and diet and fitness pages for advice on how to maintain a healthy weight.


If you are overweight, the best strategy to reduce weight is to combine nutrition and exercise.

The BMI calculator will provide you with a personal calorie limit to assist you in safely achieving a healthy weight.


If you are obese, the best approach to reduce weight is by a mix of food and exercise, as well as, in some situations, medications. See a doctor for assistance and advice.

Black, Asian, and other ethnic minorities

Some long-term (chronic) illnesses, such as type 2 diabetes, are more common in black, Asian, and other minority ethnic groups.

These adults have a body mass index (BMI) of:

  • More than 23 people are at risk.
  • 27.5 or more are considered high risk.

What is a healthy BMI in kg/m2?

Around the 18.5 to 25 kg/m2 mark.  A healthy weight is within the range of 18.5 to 25 kg/m2. Underweight is defined as a BMI of less than 18.5 kg/m2. Overweight is defined as a BMI of 25 kg/m2 to 29.9 kg/m2.

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