BMI - Body Mass Index Calculator

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Body Mass Index (BMI) Calculator

Body mass index (BMI) is a measure of body fat based on height and weight that applies to both adult men and women. BMI is recognized by the National Institutes of Health (NIH) and The World Health Organization as the best standard to judge obesity. BMI is also one of the most accurate and widely used measurements to determine if extra pounds pose health risks.

Body Mass Index (BMI)

Classification of Overweight & Obesity by BMI, Waist Circumference & Associated Disease Risks

Disease Risk Relative to Normal Weight and Waist Circumference
	BMI	Obesity Class	Men 102 cm (40 in) or less Women 88 cm (35 in) or less	Men > 102 cm (40 in) Women > 88 cm (35 in
Underweight	< 18.5
Normal	18.5 - 24.9
Overweight	25.0 - 29.9		Increased	High
Obesity	30.0 - 34.9	I	High	Very High
	35.0 - 39.9	II	Very High	Very High
Extreme Obesity	40.0 +	III	Extremely High	Extremely High

This table is from the National Heart Lung and Blood Institute

According to the National Institute of Health (NIH), your BMI score means the following:

Underweight: below 18.5
Normal: 18.5 to 24.9
Overweight: 25 to 29.9
Obese: 30 to 39.9
Extremely obese: 40 and above

While BMI is accurate for most people, it doesn't work for everyone. Please remember that:

You could have a high BMI but be at a weight that is considered healthy if you're muscular or athletic.
You could have a normal BMI and have poor nutrition.
It's important to talk to your doctor about weight-related health risks.

More information about Body Mass Index...

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This web site is intended for informational purposes only and is not intended as a substitute for medical advice. If you have any questions regarding your health, it is recommended that you consult your physician or other health care professional.