Body Surface Area Calculator - Calculator See


Body Surface Area Calculator

Calculate total body surface area (BSA in m²) using the Mosteller and Du Bois formulas for clinical oncology, chemotherapy, and renal dosing.

Calculator Inputs

in
Height.
lbs
Weight.

Calculated Results

Body Surface Area (BSA)
1.95 m²
Mosteller Formula 1.95 m²
Du Bois Formula 1.94 m²
Haycock Pediatric Formula 1.96 m²
Values calculate live as you adjust inputs.

About Body Surface Area Calculator

Body Surface Area (BSA) measures the total external surface area of the human body in square meters (m²), widely preferred over body weight in medicine for chemotherapy dosages and cardiac index normalization.

What is Body Surface Area Calculator?

Body Surface Area (BSA) measures the total external surface area of the human body in square meters (m²), widely preferred over body weight in medicine for chemotherapy dosages and cardiac index normalization.

How to Use This Calculator

  1. Enter height and weight.
  2. The tool evaluates the clinical Mosteller square-root formula.
  3. Review surface area in square meters (m²).

The Mathematical Formula & Variables

BSA (m²) = Sqrt( (Height in cm * Weight in kg) / 3600 )

Variables Definition

Symbol / Variable Name Description
1.9 m² Average Adult Male BSA Normal clinical reference baseline (1.6 m² for adult women).

Step-by-Step Worked Example

Scenario: Adult 177.8 cm tall weighing 77.1 kg.

  1. Multiply height by weight: 177.8 * 77.1 = 13,708.38.
  2. Divide by 3,600: 13,708.38 / 3,600 = 3.8079.
  3. Take square root: Sqrt(3.8079) = 1.951 m².

Result: BSA = 1.95 m²

Frequently Asked Questions

Why is BSA used instead of weight for medications?

Metabolic rate and extracellular fluid volumes correlate more closely with surface area than raw weight, preventing toxic overdoses in patients carrying significant adipose tissue.