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Are you concerned about your general health, and well being?
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BMI Calculation - About the BMI
The term BMI is often used when discussing the obesity epidemic, but what is BMI?
BMI stands for Body Mass Index. It is a number that shows body weight adjusted for height. BMI can be calculated with simple math using inches and pounds, or meters and kilograms. For adults aged 20 years or older, BMI falls into one of these categories: underweight, normal, overweight, or obese.
Body Mass Index or BMI is a tool for indicating weight status in adults.1 It is a measure of weight for height. For adults over 20 years old, BMI falls into one of these categories:
| BMI | Weight Status |
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal |
| 25.0 – 29.9 | Overweight |
| 30.0 and Above | Obese |
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Note: BMI for Children and Teens is based on gender and age specific charts.
BMI correlates with body fat. The relation between fatness and BMI differs with age and gender. For example, women are more likely to have a higher percent of body fat than men for the same BMI. On average, older people may have more body fat than younger adults with the same BMI.2
For more information about overweight among adults, see Clinical Guidelines on the Identification, Evaluation, and Treatment of Overweight and Obesity in Adults. Bethesda, MD: NHLBI, 1998.
How does BMI relate to health?
The BMI ranges are based on the effect body weight has on disease and death.3 As BMI increases, the risk for some disease increases. Some common conditions related to overweight and obesity include4
- Premature death
- Cardiovascular disease
- High blood pressure
- Osteoarthritis
- Some cancers
- Diabetes
BMI is only one of many factors used to predict risk for disease. BMI cannot be used to tell a person if he/she has a disease such as diabetes or cancer. It is important to remember that weight is only one factor that is related to disease.
Use our BMI Chart or BMI Index for your BMI Calculation. Or get the BMI for your child using
our BMI Child Chart.
BMI Calculation
Body Mass Index Formula
If you are unable to use the BMI calculator, or if you are interested in how BMI is calculated, this page has the mathematical formulas. You can calculate BMI using either feet, inches, and pounds, or meters, centimeters, and kilograms.
English BMI Calculation Formula
Body Mass Index can be calculated using pounds and inches with this equation...
| BMI = ( |
Weight in Pounds
(Height in inches) x (Height in inches) |
) x 703 |
For example, a person who weighs 220 pounds and is 6 feet 3 inches tall
has a BMI of 27.5.
| ( |
220 lbs.
(75 inches) x (75 inches) |
) x 703 = 27.5 |
Metric Formula
Body Mass Index can also be calculated using kilograms and meters (or centimeters).
| BMI = |
Weight in Kilograms
(Height in Meters) x (Height in Meters) |
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or |
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| BMI = ( |
Weight in Kilograms
(Height in centimeters) x (Height in centimeters) |
) x 10,000 |
For example, a person who weighs
99.79 Kilograms and is
1.905 Meters (190.50 centimeters) tall
has a BMI of 27.5.
99.79 Kg
(1.905 m) x (1.905 m) |
= 27.5 |
View information about the BMI Calculation for Children and Teens.
Fitness Calculators -- BMI and other Fitness Calculators
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