Body Mass Index (BMI)

Methods for determining BMI

BMI Categories

The body mass index (BMI) is calculated as weight in kilograms divided by height in meters squared. BMI calculation is one of the simplest ways to determine whether body weight is insufficient, normal or excessive.

To date, one can calculate BMI quickly and easily by several ways. To determine body mass index correctly, make use of:

  • Table
  • Online calculator
  • Special formula
  • Android or iOS apps

NIH BMI CalculatorTo provide everyone with the opportunity to find out BMI at any time and under any circumstances, the National Heart Lung and Blood Institute (NHLBI) has developed a special NIH BMI Calculator application.

This program helps to accurately calculate BMI and determine obesity degree. Download NIH BMI Calculator on your phone or tablet and use even without any internet connection. NIH BMI Calculator has a very simple and convenient interface, and is adapted for iOS and Android platforms.

If you do not have a mobile phone or tablet on hand to calculate BMI using the application or calculator, you can use the special formula: BMI = weight (kg): height (m2).

When dividing weight in kilograms by height in meters, squared, indicator of BMI is obtained. In accordance with WHO recommendations, the obtained results are interpreted as follows:

  • severe body weight deficit – less than 15
  • insufficient body weight – 16 to 18.49
  • normal weight – 18.50 to 24.99
  • overweight – 25 to 29.99
  • first degree obesity – 30 to 34.99
  • second degree obesity – 35 to 39.99
  • third-degree obesity – more than 40

One more simple and quick way to determine BMI is online calculator. To find out the body mass index, enter your weight and height parameters in the corresponding calculator windows.

It is also possible to know BMI simply and without long calculations by means of a special Table made by NIH. This is a generalized diagram, which helps to determine BMI in adult men and women.

To find out BMI, you should find your height listed in the horizontal column and your weight in kilograms in the corresponding vertical column. BMI will be indicated at the top of the table, above the weight value.

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