Body Surface Area (BSA) Calculator

The Body Surface Area (BSA) Calculator substitutes your inputs (Weight (kg), Height (cm)) into the standard expression: BSA (m²) = √(Height (cm) × Weight (kg) ÷ 3600). Every variable is read straight from the fields on this page, and the result is computed the moment you enter the values.

1. 1

   Step 1

   Type the required health measurements.

2. 2

   Step 2

   After entering the values, click "Calculate" to view the output.

3. 3

   Step 3

   Save or share the result as needed.

4. 4

   Step 4

   The breakdown lists your inputs — Weight (kg), Height (cm) next to the value computed by BSA (m²) = √(Height (cm) × Weight (kg) ÷ 3600); read it before relying on the number.

5. 5

   Step 5

   Adjust one input at a time and compare scenarios: change Weight (kg) and re-run to see which variable moves the body surface area (bsa) result most.

• 1

  The Body Surface Area (BSA) Calculator needs every variable in consistent units — Weight (kg), Height (cm) — before the standard formula returns a valid result, so check each field's unit before entering values copied from elsewhere.

• 2

  Round only at the end: Body Surface Area (BSA) carries full precision internally, so rounding intermediate values by hand can shift the final answer more than the accuracy of the formula itself ever would.

• 3

  For repeated what-if work on Body Surface Area (BSA), change one input at a time and note the effect; that isolates which variable actually drives the result instead of moving several values at once and losing the attribution.

• Percentage conventions differ by field: some Body Surface Area (BSA) inputs expect height (cm) as a whole number (5 for 5%), others as a decimal (0.05). The two forms are off by ×100 — match the field's label or example.

• Weight (kg) and Height (cm) must be entered in one consistent unit system: months against years skews the Body Surface Area (BSA) result silently. Convert every input to the unit named on its field first.