BMI Calculator

BMI, or Body Mass Index, is a widely used measure to assess an individual’s weight in relation to their height. It serves as a basic indicator of whether a person is underweight, normal weight, overweight, or obese.

BMI is a simple and convenient tool that provides a general idea of a person’s body composition and potential health risks associated with their weight.

BMI Calculator

BMI Calculator

BMI Table for Adults

*It is used for both men and women, age 20 or older.

ClassificationBMI 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 formula

BMI is calculated by dividing a person's weight in kilograms by the square of their height in meters.

Calculating BMI in the International System of Units (SI) and the US customary system (USC) using a 5'10", 160-pound individual as an example:

USC Units: BMI = 703 ×  mass (lbs) / height2 (in)
= 703 ×  160 / 702
= 22.96  kgm2

SI, Metric Units: BMI =  mass (kg) / height2 (m)  
=  72.571.782  
=  22.90 kgm2

While BMI provides a quick assessment of weight status, it's important to note that it has limitations. It doesn't directly measure body fat or account for factors like muscle mass, bone density, and distribution of weight. As a result, some individuals, particularly athletes or those with high muscle mass, may fall into a higher BMI category despite having a healthy body composition.

It's advisable to interpret BMI alongside other health indicators, such as waist circumference, body composition analysis, and medical history, to get a more comprehensive understanding of an individual's health. For instance, someone with a normal BMI might still have health risks if they have excess abdominal fat.

While BMI is a useful tool for population-level assessments and initial screenings, it's important to remember that health is multifaceted and individualized. Consulting a healthcare professional for a more personalized evaluation and advice is recommended, especially if concerns about weight and health arise.