Body Mass Index is a factor that allows us to calculate if the proportions of our body weight in relation to our height are correct. How do you calculate BMI? Calculating BMI is extremely easy, you just have to use a simple BMI formula. BMI doesn’t calculate the amount of fat in our body, but it allows to accurately state if we aren’t at risk of being obese, overweigh or underweight. Men’s BMI is calculated the same way as women’s.
Table of contents
- Calculate your BMI – formula
- Pros and cons of BMI
Calculate your BMI – formula
BMI = body weight (kg) / height (m) ²
How to calculate BMI? – Just divide your weight in kilograms by your height in metres squared, e.g.:
If you’re 165cm tall, multiply 1,65 x 1,65 = 2,7225
Then your weight, for example 60kg, divide by the result you just got: 60 / 2,7225.
That’s how you get the BMI = 22,03.
International BMI classification for adults is:
- Under 16,0 – starvation,
- 16,0 – 17,0 – emaciation (usually caused by serious illness),
- 17,0 – 18,5 – underweight,
- 18,5 – 25,0 – correct value,
- 25,0 – 30,0 – overweight,
- 30,0 – 35,0 – I degree of obesity,
- 35,0 – 40,0 – II degree of obesity,
- Over 40,0 – III degree of obesity (morbid obesity).
Children’s BMI is calculated in the same way as adults, but it’s then compared to average results for their age group. Instead of determining intervals indicating if a child is obese, overweight or underweight, the BMI index in children allows you to compare the factors against other children of the same gender and age. Studies in Great Britain show for example, that girls at the ages of 12-16 have a much larger BMI factor than boys from the same age group.
Pros and cons of BMI
The biggest characteristic advantage of BMI is the fact that we can calculate it easily. Studies show that BMI 18,5-25 features people who live longer, and have less of a chance to get any diseases related to their diet, such as type 2 diabetes or atherosclerosis. At the same time, abnormal coefficients are a valuable clue to take care of our health. We might be at risk of being underweight, overweight or obese, and that is followed by dangerous illnesses.
A normal BMI is not always a guarantee that our body mass is correct. We can still suffer from hidden obesity, which is usually diagnosed in people who aren’t physically active. A more accurate option here would be to find out the percentage of fat tissue in the body. At the same time, a higher BMI does not always mean that we’re overweight. People with a large muscle mass, for example athletes or bodybuilders will have a high BMI value, but they can also be in perfect health. Scientists are also wondering about implementing BMI classification based on geographical and cultural conditions.
World Health Organisation often uses BMI to calculate the percentage of people suffering from obesity or who are overweight, especially in western countries, where being overweight is the most common civilisation disease. Now you know how to calculate BMI. The results you get can suggest that your body is exposed to diseases related to your diet. At the same time, it can be your motivation to apply changes to your eating and living habits.