Body Surface Area Calculator for medication doses

Calculates Body Surface Area for medication doses and includes descriptive statistics.

Step 1. Enter Height & Weight then click "Calculate".

Weight: can  convert
lbs to kg
Height:    or   
 using Formula:
click for info re: Body Surface Area formulas

Body Surface Area = m2


Step 2.  Safety Check.  Set Age and Gender, then re-Calculate.

Age:  years or 


Body description:

Step 3. Optional Medication Dose Calculator

Multiply BSA m2  x Dose/m2


Additional Statistics:
Height is at: Compared to
others of same Age
Weight is at:
Weight is at: Compared to
others of same Height
Other formulas:
Body Mass Index: kg/m2
Lean Body Weight:
Ideal Body Weight:

 for default units
( lbs/kg, in/cm) and calculation formula.


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BSA is a measurement used in many medical tasks.  Various Body Surface Area formulas have been developed over the years, originally by Dr.s  Du Bois & Du Bois,  followed by Gehan and George, Haycock, Boyd and Mosteller.  These formulas all give slightly different results.  It is probably not worth the trouble to debate about which formula may or may not be slightly better.  A bigger issue is lack of standardization. The Mosteller formula is gaining support as a common standard because it is much simpler and can memorized and easily calculated with a hand-held calculator.

See also: to look up medication dosages, for drug dose information. A useful resource.


Last modified 24-January-2012
Created by Steven B. Halls, MD.

body surface area bsa calculator