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Earth Bondhon
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Małgorzata Koperska, MD Steven Wooding
Last updated: November 13, 2025

Body Surface Area Calculator | Fast BSA Measurement Online

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Body Surface Area Calculator

Body Surface Area Calculator

Calculate your Body Surface Area (BSA) easily using height and weight. Essential for medical dosage, body health, and metabolic rate analysis.

Body Surface Area Calculator:

The Body Surface Area (BSA) Calculator is used to estimate the body surface area of a human being, according to height and weight. This is a value that is commonly applied in the medical and clinical world to calculate the dosage of drugs, the metabolic rates of drugs, and health evaluations. The calculator gives an actual BSA result immediately using formulas such as Du Bois & Du Bois, Mosteller, or Haycock.

Work & Installation — Input to Output Summary:

  • Input: Weight (kg or lbs) and height (cm or inches).
  • Process: The calculator can use several formulas, most commonly the Mosteller formula:
    \( BSA = \sqrt{\frac{\textrm{height (cm)} \times \textrm{weight (kg)}}{3600}} \)
    Du Bois & Du Bois:
    \( BSA = 0.007184 \times height^{0.725} \times wight^{0.425} \)
    Haycock
    \( BSA = 0.024265 \times height^{0.725} \times wight^{0.425} \)
  • Output:

Testing and Final Adjustments

Test the BSA calculator with the reference data of standard medical tables to test the accuracy of the formula in all formulas. Check that the users are able to freely change between metric and imperial units and that the precision of the decimals is the same. Label formula labels so that the users understand what method they are using. Validation in the field to avoid unrealistic values (e.g, height less than 50 cm or weight more than 300 kg). Make the UI user-friendly and calculate instantly when there is a change in the input. Clinical understanding: To provide clinical clarity, show tooltips to justify how BSA applies to drugs and chemotherap,y as well as to medical examinations. Include a disclaimer, as the information is to be used only as information and is not to be used in place of professional medical advice. SEO Optimize good metadata, headings, and descriptions using low competition keywords.

Frequently Asked Questions - Body Surface Area Calculator:

What is a body surface area calculator?

A BSA calculator estimates the total surface area of the human body using height and weight measurements.

Why is BSA important in medicine?

BSA is used to determine accurate drug dosages, especially in chemotherapy and pediatric medicine.

Which formula is most accurate for BSA?

The Mosteller formula is widely used for its simplicity and accuracy in clinical settings.

What units does the calculator use?

You can use kilograms/centimeters or pounds/inches, and results are shown in square meters (m²).

Is BSA the same as BMI?

No, BMI measures body mass relative to height, while BSA estimates body surface area.

Can BSA predict metabolism?

Yes, BSA correlates with metabolic rate and can help assess energy expenditure.

Is this calculator suitable for children?

Yes, BSA formulas like Haycock or Boyd are designed for both children and adults.

How do I use BSA in drug dosage?

Doctors use BSA to calculate precise dosages for medications based on body surface area.

Is this tool medically approved?

It follows standard BSA formulas used in clinical research but isn’t a certified medical device.

Is this BSA calculator free?

Yes, it’s a free, easy-to-use online calculator that estimates body surface area instantly.

Earth Bondhon

Earth Bondhon

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