Body Mass Index

Body Mass Index – Metric Calculation

How is the Body Mass Index Calculated?

Body Mass Index is the weight of one person in kilograms divided by the square meter in meters. BMI does not directly measure body fat, but research has shown that BMI is correlated with skin thickness measurements, bioelectrical impedance, densitometry (underwater weighing), dual-energy x-ray absorptiometry (DXA), and direct body fat measurements obtained from others. It appears to be a direct measure of body resistance and strongly associated with various metabolic and disease outcomes. In general, BMI weight category, such as overweight, normal and obesity, such as a cheap and easy to apply scanning method. This page provides detailed information on how to calculate the body mass index.

How to use BMI?

High BMI can be a sign of swelling in the body. BMI can be used as a screening tool but it does not diagnose an individual’s obesity or health in the body. In order to determine whether the BMI is a high health risk, a health care provider needs to make further assessments. Measurement of the thickness of the skin by mass index may include assessment of the diet, physical performance, family history and other appropriate health screening, if any. BMI is calculated in the same way for both adults and children.
In the metric system, the BMI formula is divided by the weight in kilograms by the height of the square meter. Since the height is usually measured in centimeters, the height should be divided in centimeters to obtain a height in meters.


Weight = 68 kg,

Height = 165 cm (1.65 m)

Calculation: 68 ÷ (1.65) 2 = 24.98

What are the tendencies of BMI?

Adult prevalence of 25 or greater increased obese status. Recently, this trend has remained high except for older women. Obesity continued to increase in adult women aged 60 and over. BMI can be used for population assessment of overweight and obesity. Because the calculation requires only height and weight, it is cheap and easy to use for clinicians and the public. BMI can be used as a screening tool for body fatigue, but does not diagnose. For adults 20 years and older, BMI is interpreted using standard weight status categories. These categories are the same for all body types and men and women of the same age.

Other Ways to Evaluate BMI

Together with the BMI, these methods are not always readily available or they are expensive or need to be carried out by highly trained personnel. Furthermore, many of these methods may be difficult to standardize between observers or machines, making comparisons between studies and time periods difficult. You can use the above mentioned BMI usage, trends and other evaluation services in more detail.