BMI Calculator

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What is BMI?

The BMI stands for Body Mass Index, measures a person’s body composition or corpulence depending on their height and weight, and is used to estimate tissue mass. It is often used to generalize whether a person’s body mass is appropriate for their height.

Furthermore, the number derived from BMI calculation is used to determine if a person is underweight, average weight, overweight, or obese based on where the value falls within a given range. These BMI levels vary by area and age and are frequently subdivided into subtypes such as extremely underweight or severely obese.

Being underweight or overweight can have serious health consequences. While BMI is an inaccurate measurement of a healthier weight, it can help determine whether more tests or action is needed. The table below shows the different BMI-based classifications considered by the calculator.

How to calculate Body Mass Index

BMI is a basic calculation based on a person’s body weight and height. For example, BMI = kg/m2, where kg represents a person’s in kg and m2 represents their height in meters square. Overweight is known as a BMI of 25.0 or above, while the healthy range is 18.5 to 24.9.

Who should not use a BMI calculator

BMI is not recommended by bodybuilders, long-distance runners, pregnant women, the old, or small children. BMI does not consider if the weight is transported as muscle or fat, only the quantity. Athletes, for example, who have a larger muscle mass, may have a higher BMI but are not at increased health risk.

Those with lesser muscle mass, such as youngsters who have not finished growing or the old who may be decreasing muscle mass, may have had a lower BMI. Because a woman’s body composition changes throughout pregnancy and breastfeeding, utilizing BMI is inappropriate.

BMI Table

This is the WHO suggested bodyweight depending on BMI measurements. It is appropriate for both men and women over the age of 18.

CategoryBMI range – kg/m2
Severe Thinness< 16
Moderate Thinness16 – 17
Mild Thinness17 – 18.5
Normal18.5 – 25
Overweight25 – 30
Obese Class I30 – 35
Obese Class II35 – 40
Obese Class III> 40

BMI Table for Children and Teens (Age 2-20)

The CDC recommends BMI classification for children and teenagers aged 2 to 20.

CategoryPercentile Range
Healthy weight5% – 85%
At risk of overweight85% – 95%


BMI can provide a general approximation of a person’s health and weight condition when analyzing populations and developments. It is most likely the most proper guidance we have for the time being.

To avoid gaining extra weight so quickly, it may be more significant to maintain a healthy lifestyle that includes a well-balanced diet and frequent exercise.

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