How to Calculate BMI BSA
BMI and BSA are acronyms for health-related formulas that factor in the height and weight of the individual who is being measured. BMI stands for Body Mass Index and involves a calculation of the individual's weight divided by height. BSA is Body Surface Area and is found through a series of multiplications of weight and height.
Instructions
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Taking Measurements
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1
Weigh the individual and record the information. The less clothing on the person being weighed, the more accurate the numbers will be.
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2
Instruct the person to remove his shoes and socks, and measure his height with the measuring tape.
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3
Multiply the person's weight by .4535 if you measured in pounds to convert it to kilograms.
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4
Multiply the height by 2.54 if you measured in inches to convert to centimeters.
Calculating BSA
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5
Find the result of the measured weight in kilograms taken to the .425 power. Most scientific calculators will accomplish this by entering the weight, pressing the "X^y" button and putting .425 inside the parenthesis after the "^" character.
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6
Find the result of the measured height in centimeters taken to the .725 power by entering the height, pressing the X^y button and putting .725 inside the parenthesis after the ^ character.
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7
Multiply the results of steps 1 and 2.
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8
Multiply the result of Step 3 by 0.007184.
Calculating BMI
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9
Divide the individual's height by 100.
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10
Square the number found in Step 1.
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11
Divide the individual's weight by the number found in Step 2.
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