Body Surface Area BSA Calculator For Medicinal Purposes

This calculator measures the total surface area of the body to determine the dosage of drugs or the amount of fluids. This measurement is used for medicinal purposes only.


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BSA: m2

BMI: Kg/m2

What Is Body Surface Area?

It is the calculated surface area of the body. It is often clinically determined to measure the metabolic mass of the body and is less likely to be affected by fat mass. BSA measurement is important to measure cardiac index (relates heart performance to body size of the individual).

How To Calculate Body Surface Area?

BSA depends on the height and weight of an individual.

Mosteller Formula

BSA = 0.016667 × W0.5 × H0.5

Where W is the weight of a person in kg/lbs, and H is the height of a person in cm/inch.

If you want to know the standard range of BSA, click here.

BSA is calculated for clinical purposes to determine the following:

  • Cardiac Index: BSA determines the functioning of the heart based on body size.
  • Renal Clearance Rate : BSA is required to determine glomerular filtration rate.
  • The dose of chemotherapy is often determined by BSA value

Frequently Asked Questions

What is a normal BSA?

The normal BSA is generally taken to be 1.7 m².

What BSA is obese?

The BSA in obese people is 2.21 +/- 0.22 m².

What is the difference between BSA and BMI?

BMI is the measure of a person’s body fat mass, while BSA is the total surface area of a person’s body.

How does Dubois calculate body surface area?

According to Dubois, BSA = (Weight [kg] 0.425 × height [cm] 0.725) × 0.007184.


  1. Indexing of renal functions parameters by Body Surface Area : Intelligence or Folly? Nephron Clinical Practice, Karger.

  2. How to Calculate Dose of Chemotherapy, British Journal of Cancer, Springer Nature.

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