BMI Calculator

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Body Mass Index

To work on solutions, let’s first understand the term Body Mass Index or BMI, which is commonly used as a factor to decide if the person is obese or not.

BMI is the measurement of a person’s weight with respect to his/her height. If the BMI score is more, you have more fat stored in the body.

A normal BMI score is between 18.5 and 24.9. If you have a BMI that falls in this range, your weight is normal for your height. A BMI chart can be used to categorize any person for underweight, overweight, obese, and normal.

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What is Body Mass Index (BMI)?

Sometimes they are also known as the Quetelet index, which is calculated based on height and weight. It is estimated to understand how much tissue mass (bone, fats, and muscle) is in a person. It can also be calculated using a BMI chart table.

Why to calculate your BMI?

The results based on your BMI value determined whether you are obese, overweight, healthy or underweight. Being below or beyond a normal BMI range is harmful to your overall health.

BMI ranges:

Here is what your BMI range says about your health:

Under Weight

less than 18.5

Normal Weight

18.5 – 24.9


25 – 29.9

Obesity (Class 1)

30 – 34.9

Obesity (Class 2)

35 – 39.9

Extreme Obesity (Class 3)


World Health Organization’s latest statistics as of 2018 says that obesity has tripled since 1975. WHO has defined obesity as “abnormal or excessive fat accumulation that may impair health. Keeping aside the aesthetics of too much fat is bad for your body.

How to Calculate BMI?

It is quite a simple formula that needs only your height and weight.

  • The imperial BMI formula = Weight (LBS) x 703 ÷ Height (Inches²)
  • The metric BMI formula = Weight (KG) ÷ Height (Metres²)

If you wish to calculate your BMI using the imperial system, here are the conversion figures:

  • 1 kilogram = 2.2 pounds
  • 1 foot = 12 inches
  • 1 inch = 2.54 centimetres

If you are 5ft 4 inches by the imperial system, you are 162.56cm or 1.63m (rounded up) by the metric system.

Use of calculating BMI:

BMI is 150 years old, and many big health organizations such as CDC and NIH consider It as a reliable health indicator:

Public Health Statistics:

It is used as a national measure for obesity rates. It is also helping to determine the risk of associated comorbidities such as cardiovascular health, type 2 diabetes, hypertension and more.

Weight Range Analysis:

BMI is considered an accurate measure. If you have a BMI of 26, you are considered overweight, leaving aside what you weigh otherwise, gender and body composition.

Tool for Screening Weight Problems:

It goes step by step. Suppose you don’t fall under the normal BMI range. In that case, your physician calculates your risk of other health problems or whether you can develop serious health issues later in your life.

BMI for Indian men:

Indian men have an average BMI value of 22, which is higher than about 20 countries globally.

BMI for Indian women:

Indian women have an average BMI value of just 21.4. 6 countries globally have a lower figure- Bangladesh, Eritrea, Ethiopia, Sri Lanka, Nepal, and Vietnam.

BMI for Indian children:

The BMI calculator works the same for children, but the measurement is used differently. While the BMI range remains the same in adults, in children, it varies since they are still growing and at a different pace. Thus, the calculations result in body mass index percentile.

50th percentile- 50% of children of the same age has the same BMI or less.

85th percentile- 85% of children has the same or lower BMI, and your kid is at risk of becoming overweight.

95th percentile- Your kid is classified as overweight.


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