Body Surface Area Calculator
Calculate Body Surface Area using Mosteller, DuBois, and Haycock formulas. Used in chemotherapy dosing and clinical medicine.
What is Body Surface Area Calculator?
This BSA calculator computes your body surface area in square meters using three validated formulas. BSA is critical in clinical medicine for cancer chemotherapy dosing, burn assessment, and renal function estimation.
Should I use this during pregnancy?
Pregnancy-related calculators provide general estimates. Always follow your gynecologist's specific guidance, as individual pregnancy journeys vary significantly.
How to Use This Calculator
- Enter your Weight, Height in the input fields provided
- Results are computed instantly as you enter or modify values — no need to click a button
- Review the computed output showing your body surface area results with a detailed breakdown
- Discuss the results with a healthcare professional for personalised guidance — this tool provides estimates, not diagnoses
How Body Surface Area Calculator is Calculated
This calculator uses the formula: BSA (Mosteller) = √(Weight × Height / 3600). Where DuBois: 0.007184 × W^0.425 × H^0.725 ; Normal adult: 1.6–2.0 m². Body Surface Area is used for drug dosing (especially chemotherapy) and burn assessment. All calculations run entirely in your browser — no data is transmitted to any server.
Frequently Asked Questions
Why is BSA used instead of body weight?
BSA correlates better with metabolic rate and organ size than weight alone, especially for extreme body sizes. Chemotherapy drugs dosed by BSA achieve more consistent drug concentrations across patients of different sizes.
What is a normal BSA?
Average adult BSA is 1.7–1.9 m² for men and 1.5–1.7 m² for women. The Mosteller formula (√(height cm × weight kg / 3600)) is most commonly used due to its simplicity.
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Why This Tool Is Essential
Health metrics provide crucial insights into your wellbeing, and Body Surface Area Calculator gives you accurate, clinically-validated results instantly. For Indians and South Asians, standard health benchmarks often need adjustment — this calculator accounts for population-specific factors. With India's growing lifestyle disease burden (diabetes affects 101 million Indians), proactive health monitoring through tools like this is more important than ever. Your health data stays completely private — all calculations happen in your browser.
Key Features
- Instant Body Surface Area Calculator calculation with validated formulas
- Detailed step-by-step result breakdown
- Works offline as a Progressive Web App
- Completely free — no signup or data collection
- Mobile-friendly responsive design
- Save and share your results easily
Tips for Better Results
- 💡 Consult a healthcare professional before making major lifestyle changes based on calculator results.
- 💡 Track your metrics over time — trends matter more than single measurements.
- 💡 For Indians, use Asian-specific health benchmarks when available.
- 💡 Combine multiple health metrics for a comprehensive picture — don't rely on one number.
- 💡 Regular health check-ups complement calculator-based monitoring.
Ideal Users
Health-conscious individuals monitoring their wellness, fitness enthusiasts and gym-goers tracking progress, healthcare professionals during patient assessments, and anyone proactively managing their health.
📚 Complete Guide Available
Want to learn more? Read our comprehensive guide with detailed explanations, real-world examples, expert analysis, and actionable tips.
Read: BSAMedical disclaimer: This calculator provides general estimates and is not a substitute for professional medical advice, diagnosis, or treatment. Results may vary based on individual factors. Consult a healthcare professional for personalized guidance. See our full Disclaimer.
Maintained by: Sagar Sahni, Calc Labz | Review: formula checks, worked examples, and periodic updates
Need a correction? Contact us with the calculator name, your inputs, and the issue you found.
Last updated: April 2026