Health / Browser calculator

Body Surface Area Calculator

Body Surface Area Calculator works from the inputs you provide and returns body surface area (m²). Use the calculation panel to explore a scenario, then check the formula and limitations before applying the result.

Your inputs

Minimum: 1e-06 · Maximum: 1500
Minimum: 1e-06 · Maximum: 300

Your results

Enter your values and calculate to see the result.

This calculator is for informational purposes only and is not a substitute for professional medical advice.

Formula and calculation method

Mosteller BSA = √[height in cm × weight in kg / 3600].

Do not use this result alone to calculate medication doses.

How to use body surface area calculator

  1. Set Measurement system by choosing the option that matches your calculation.
  2. Set Weight (kg or lb). The example below uses 70.
  3. Set Height (cm or inches). The example below uses 175.
  4. Select Calculate to update the result. Reset restores the illustrated inputs. Copy, print or download your own result if you need a record.

Worked example

Example inputs
Measurement system
Metric (kg, cm)
Weight (kg or lb)
70
Height (cm or inches)
175
Body surface area (m²)
1.84466197

Factors affecting your result

Do not use this result alone to calculate medication doses.

Changing measurement system changes the scenario being evaluated. Adjust one input at a time when comparing results, keep a copy of the assumptions, and compare values using the same unit and period. A precise arithmetic result does not make an uncertain assumption precise.

Frequently asked questions

How does the body surface area calculator work?

Mosteller BSA = √[height in cm × weight in kg / 3600].

What inputs does Body Surface Area Calculator need?

Enter measurement system, weight (kg or lb), height (cm or inches). Choose values that correspond to the same situation and measurement convention.

How should I interpret the body surface area calculator result?

Do not use this result alone to calculate medication doses.

Are my body surface area calculator inputs uploaded?

No. The calculation runs in this browser. Favorites, recent tool names, theme and formatting preferences may be saved locally, but calculation inputs are not sent to a calculation server or stored by this website. Shared links do not include entered values.

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