Body Mass Index, BMI

The Body Mass Index or BMI is a standard weight assessment using weight and height. It estimates healthy ranges of weight for certain heights of people. It is one of the most common diagnostic tools to determine if a person is underweight, normal, overweight, obese, or morbidly obese.

Category	BMI Range (kg/m²)
Severely underweight	less than 16
Moderately underweight	16 - 16.99
Mildly Underweight	17 - 18.49
Normal	18.5 - 24.99
Overweight	25 - 29.99
Slightly Obese	30 - 34.99
Moderately Obese	35 - 39.99
Morbidly Obese	40 or higher

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You can compute your BMI using this formula:

BMI = kg / m² = (weight in kilograms) / (height in meters)²

For example:

Weight = 65 kilograms

Height = 170 cm or 1.7 meters

Body Mass Index = 65 / (1.7 x 1.7) = 22.48

This falls within the ideal weight range.

However, a high value can be associated with serious health risks including obesity, heart disease, diabetes, cancer. Your BMI provides a helpful guideline for achieving the weight range that is healthiest for you.

Remember that this is one of several measures that you can use. A person with a healthy weight can have excess body fats and lack lean muscle mass in the body. So, another helpful indicator is the body fat percentage (BFP), which gives a more accurate assessment. Waistline, weight, and waist-hip ratio (WHR) are useful measurements you can use in your health journey.

6 feet	Height	6 feet
230 pounds	Weight	230 pounds
35 inches	Waistline	50 inches
31.2	BMI	31.2
Slightly Obese	BMI Category	Slightly Obese
Normal	BFP Category	High Risk
Normal	WHR Category	High Risk

Here is a possible difference in the assessment between body mass index and body fat percentage. It's best to use BMI with other tools. Take note that bodybuilders, with their unique diet, have very low body fat percentage (BFP) which is normal. An average person with very low body fat percentage would be categorized as too thin.

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Info bits: According to the World Health Organization (WHO), "Overweight and obesity lead to serious health consequences. Risk increases progressively as BMI increases. Raised body mass index is a major risk factor for chronic diseases such as cardiovascular disease (mainly heart disease and stroke), diabetes, musculoskeletal disorders (especially osteoarthritis), and some cancers like endometrial, breast, and colon."