What is the formula for body surface area?
Daniel Rodriguez
Published Mar 04, 2026
What is the formula for body surface area?
The most commonly used formula now is that of Mosteller, published in 1987 in The New England Journal of Medicine. According to Mosteller’s “simplified calculation of body-surface area In metric terms” the body surface area = the square root of product of the weight in kg times the height in cm divided by 3600.
How is BSA calculated in nursing?
The formula is as follows[1]: Body Surface Area= 0.007184 x (Height(m)^0.725) x (Weight(kg)^0.425)
How do you calculate BSA step by step?
Body Surface Area (BSA)
- Calculate weight in kilograms: 210 pounds ÷ 2.2 = 95.45 kg.
- Calculate height in centimeters: 6 feet, 3 inches = 75 inches x 2.54 cm/inch = 190.5 cm.
- Multiply height by weight and divide by 3600. (190.5 cm x 95.45 kg) ÷ 3600 = 5.
- Take the square root of 5 = 2.24 m2
What is Clark’s rule formula?
Clark’s rule equation is defined as the weight of the patient in pounds divided by the average standard weight of 150 pounds (68 kg) multiplied by the adult dose of a drug equals the pediatric medication dose, as is demonstrated below: (Weight* divided by 150 lbs.) x Adult Dose** = Pediatric Dosage.
What is BSA and how is it calculated?
Body Surface Area (BSA) measures the total surface area of a person’s body and is frequently used in order to calculate drug dosage. It calculates BSA by taking the square root of height (cm) multiplied by weight (kg) divided by 3600.
How is BSA DuBois calculated?
The first of these formulae was proposed in 1916 by Du Bois and Du Bois (BSA [m2] = Weight [kg]0.425 × height (cm)0.725 × 0.007184]. It is a mathematical equation derived from measurements of weight and height of only nine patients including just a child.
How is chemo body surface area calculated?
Cancer Chemother Rep 1970;54:225-35.
- Equation: BSA (m2) = 0.0235 x Height(cm)0.42246 x Weight(kg)0.51456
- Equation: BSA (m2) = 0.024265 x Height(cm)0.3964 x Weight(kg)0.5378
- Equation: BSA (m2) = SQR RT ( [Height(cm) x Weight(kg) ]/ 3600 )
How do you calculate pediatric body surface area?
The formula by Meban (BSA m2 = 6.4954 × weight (g) 0.562 × height (cm) 0.320) is possibly the best to estimate the body surface of newborns, followed by the Mosteller (√[(height in cm × weight in kg)/3600]) formula; however, the Boyd and Dubois formulas are not recommended for surface estimation of newborns for …
What is average adult body surface area?
The total surface area of the human body. Average body surface area for adult men: 1.9 m2. Average body surface area for adult women: 1.6 m2. Average body surface area for children (9 years): 1.07 m2.
What is Fried’s law?
Fried’s rule is a method of estimating the dose of medication for a child by dividing the child’s age in months by 150 and multiplying the result by the adult dose. Pediatric dose = child’s age in months. 150.
What is Youngs formula?
The definition of Young’s Rule is the age of the patient, divided by the age added to twelve, all multiplied by the recommended adult dose. This formula appears below: [Age / (Age + 12)] x Recommended Adult Dose = Pediatric Dose.
How do you calculate the total body surface area for a burn?
The Wallace Rule of Nines is a clinically efficient and accurate method to calculate the total body surface area of a burn….What is the Wallace Rule-of-Nines?
| Rule-of-9s | Total | Subdivision |
|---|---|---|
| Head | 9% | Anterior Head = 4.5% Posterior Head = 4.5% |
| Torso | 18% | Chest = 9% Abdomen = 9% |
| Back | 18% | – |
How do you calculate body surface area?
body surface area. Body surface area in meters squared: First multiply the patient’s weight in kg and height in cm. Second, divide that number by 3,600. Finally, calculate the square root of that number. Or, in non-metric: First multiply the patient’s height in inches and weight in pounds.
The most commonly used formula now is that of Mosteller, published in 1987 in The New England Journal of Medicine. According to Mosteller’s “simplified calculation of body-surface area In metric terms” the body surface area = the square root of product of the weight in kg times the height in cm divided by 3600.
How to do body surface area calculations?
Body Surface Area. Calculate body surface area given the height and weight. Body surface area (m2) =. The calculation is from the formula of DuBois and DuBois: BSA = (W 0.425 x H 0.725) x 0.007184. where the weight is in kilograms and the height is in centimeters.
How to figure body surface area?
Estimating Body Surface Area (BSA) To estimate your body surface area our BSA calculator uses the following formula[1]: 0.20247 x height (m)0.725 x mass (kg)0.425. where height is in meters and mass is in kg. The result is in squared meters, which easily be converted to square feet, inches or yards as needed.
