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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 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) |
|
|
|
or |
|
|
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 |
|
Risk of Associated Disease According to BMI and
Waist Size |
|
BMI |
Condition |
Waist less than or equal
to
40 in. (men) or
35 in. (women) |
Waist greater than
40 in. (men) or
35 in. (women) |
|
18.5 or less |
Underweight |
-- |
N/A |
|
18.5 - 24.9 |
Normal |
-- |
N/A |
|
25.0 - 29.9 |
Overweight |
Increased |
High |
|
30.0 - 34.9 |
Obese |
High |
Very High |
|
35.0 - 39.9 |
Obese |
Very High |
Very High |
|
40 or greater |
Extremely Obese
|
Extremely High
|
Extremely High |
Table 2: Average height and weight charts
Referred
from Bray, G.A., Gray, D.S.,
Obesity, Part I, Pathogenesis, West J. Med. 1988: 149: 429-41.
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