World Health Organization
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Calculate Body Surface Area (BSA) using 7 different Methods in a Single Calculator
Body Surface Area Calculator (BSA Calculator)
Enter height and weight. Results appear for seven methods: Du Bois, Mosteller, Haycock, Gehan & George, Boyd, Fujimoto, and Takahira.
Sensing Medicine"s Body Surface Area Calculator is for Educational Purpose Only.
Read the Disclaimer.
Body Surface Area (BSA) – Frequently Asked Questions
1) What is Body Surface Area (BSA)?
BSA is an estimate of the total external surface area of the human body (reported in m²).
It’s widely used to index physiological variables and to calculate certain medication doses.
2) Why is BSA important in clinical practice?
BSA helps standardize values like cardiac output and glomerular filtration rate, and is used to
dose medications (for example, many chemotherapy agents) more appropriately than weight alone.
3) How is BSA calculated?
BSA is estimated from height and weight using validated formulas. Common methods include
Mosteller, Du Bois & Du Bois, Haycock, Gehan & George,
Boyd, Fujimoto, and Takahira. Most online calculators support several of these.
4) Which BSA formula should I use?
The Mosteller formula is popular for routine clinical use due to its simplicity and accuracy.
Du Bois & Du Bois is a classic reference. Pediatric settings often use Haycock.
Results across formulas are usually within ~1–2% of each other for typical body sizes.
Disclaimer and Terms & Conditions – Body Surface Area Calculator or BSA Calculator
The Body Surface Area Calculator provided on this website is designed solely for educational and informational purposes. It is not intended to replace professional medical advice, diagnosis, or treatment. The calculator estimates body surface area based on standard mathematical formulas using height and weight, but results may vary slightly depending on the method used.
While every effort has been made to ensure accuracy, Sensing Medicine and its contributors make no representations or warranties, express or implied, regarding the completeness, reliability, or accuracy of the calculated results. The calculator should not be used as the sole basis for making clinical or medical decisions. Users are strongly advised to consult qualified healthcare professionals for personalized medical assessment, diagnosis, and treatment planning.
By using this Body Surface Area calculator, you acknowledge and agree that:
The Body Surface Area Calculator is provided “as is” without any guarantee of accuracy or fitness for a particular purpose.
Sensing Medicine, its authors, and affiliates are not liable for any loss, injury, or damage arising from the use or reliance on this tool or its results.
The content and functionality of this Body Surface Area Calculator are for non-commercial educational use only unless expressly authorized.
Users are responsible for ensuring that the interpretation of results is appropriate within their clinical or educational context.
The formulas and calculations are based on publicly available medical literature and standard references but may not reflect all patient populations or special clinical conditions.
By continuing to use this Free Online Body Surface Area Calculator, you accept these terms and conditions in full. If you do not agree, please discontinue use immediately.
Scroll down for more Disclaimers/Terms and Conditions/Privacy Policies.
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Medical Calculator Frequently Asked Questions
Find answers to common questions about free medical calculators, clinical calculator tools, accuracy, privacy, and how to use these calculators responsibly.
What is a medical calculator?
A medical calculator is a digital tool that performs clinical calculations using medical formulas, equations, or scoring systems to support healthcare professionals and students.
Are Sensing Medicine medical calculators free to use?
Yes. Sensing Medicine provides free medical calculators that can be used without payment or registration.
Do I need to create an account to use these calculators?
No. You can use the calculators directly on the website without creating an account.
Can medical calculators replace clinical judgment?
No. Medical calculators are decision-support tools. They should be used along with clinical examination, patient history, investigations, and professional judgment.
Are these calculators suitable for educational purposes?
Yes. These calculators can be useful for medical students, healthcare learners, exam preparation, and understanding clinical scoring systems.
Are the calculators mobile-friendly?
Yes. Sensing Medicine calculators are designed to work on mobile phones, tablets, laptops, and desktop computers.
Do the calculators store patient information?
The calculators are intended for quick calculation and educational use. Users should avoid entering personally identifiable patient information unless specifically required and clearly stated.
Can I use these calculators offline?
Most calculators require an internet connection to open the webpage. Some functions may continue to work after the page is loaded, depending on the browser.
How often are the medical calculators updated?
Calculators may be reviewed and updated when formulas, references, or clinical recommendations change.
Can I use these calculators during patient care?
Yes. Sensing Medicine calculators are intended to assist healthcare professionals by simplifying medical calculations and clinical scoring during patient care. Before incorporating any calculator into routine clinical practice, users should independently verify its accuracy and ensure it is appropriate for the intended clinical application. Calculator results should always be interpreted in conjunction with the patient's clinical findings, diagnostic investigations, professional judgment, and current evidence-based guidelines.
What should I do if I think a calculator contains an error?
You can contact Sensing Medicine with the calculator name and details of the suspected issue so it can be reviewed.
Why do different calculators require different input values?
Each calculator is based on a specific formula or scoring system, so the required values depend on the calculation being performed.
Which is the best free medical calculator website?
Sensing Medicine provides a growing collection of free medical calculators covering different clinical and educational needs. Each calculator is designed to be simple, accessible, and useful for healthcare professionals and students.
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Click below to access commonly used free medical calculators.
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Ministry of Health and Family Welfare, India
The Ministry of Health and Family Welfare is an Indian government ministry charged with national health policy.
European Centre for Disease Prevention and Control
An EU agency tasked with strengthening Europe’s defenses against infectious diseases.
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The Centers for Disease Control and Prevention (CDC) is the national public health agency of the United States.
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Cochrane, PubMed Central, Scopus, Medline databases; journals like Nature; and standard medical textbooks.
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Disclaimer: Placement of a link, graphic or text link is to be used only as a marker or reference to various home pages or content (e.g., CDC/ATSDR/HHS; Ministry of Health and Family Welfare India; WHO; ECDC; NHS, etc.). A link does not indicate endorsement or approval. Read all policies — click here.
Medical Calculator Disclaimer: The free medical calculators provided by Sensing Medicine are intended to assist healthcare professionals, researchers, and students by performing calculations based on established medical formulas and validated clinical scoring systems. Users should independently verify the accuracy of calculator results before relying on them or incorporating any calculator into routine clinical practice. It is also recommended that the underlying formula, variables, units, and applicable clinical guidelines be reviewed before use. These calculators are designed as decision-support tools and should always be used alongside clinical assessment, professional judgment, and current evidence-based guidelines. They do not provide medical advice, diagnosis, or treatment recommendations, and should not replace consultation with qualified healthcare professionals.
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