Body Surface Area Calculator - Calculate BSA Online Free
Free online body surface area calculator using multiple scientific formulas including Du Bois, Mosteller, and Haycock methods. Get personalized drug dosage estimates and health insights.
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The health and fitness tools provided on this website are for informational and educational purposes only. The information contained herein is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website. The results provided by these tools are estimates based on general formulas and may not apply to your specific situation. If you think you may have a medical emergency, immediately call your doctor or dial emergency services.
About This Body Surface Area Calculator
Body Surface Area (BSA) is a critical measurement in medicine for calculating drug dosages, assessing burn injuries, and evaluating cardiac function. Our advanced calculator uses 5 scientifically validated formulas including Du Bois, Mosteller, Haycock, Gehan-George, and Boyd methods to provide comprehensive results. Compare formula differences, analyze weight change impacts, and get expert health insights all in one place.
- 5 scientifically validated BSA calculation formulas
- Multi-formula comparison with percentage differences
- Weight change impact visualization and analysis
- Drug dosage estimation assistant (educational use)
- Age and gender reference comparison
- Personalized health insights and expert analysis
Frequently Asked Questions
How to calculate BSA body surface area?
Body surface area is most commonly calculated using the Du Bois formula: BSA = 0.007184 × height^0.725 × weight^0.425, where height is in cm and weight in kg. Other formulas like Mosteller (simplest) or Haycock also exist for different clinical applications.
What is a BSA of 1.7 m²?
A BSA of 1.7 m² is within the normal range for average-sized adults. Typical adult BSA ranges from 1.5-1.9 m² for women and 1.6-2.0 m² for men. BSA of 1.7 m² is commonly used as a reference in clinical settings.
Is BSA in m²?
Yes, body surface area is typically expressed in square meters (m²), though sometimes square feet (ft²) may be used in some regions. Medical and scientific applications universally use m² as the standard unit for BSA measurements.
What is BSA and how is it calculated?
Body Surface Area (BSA) measures the total surface area of the human body. It's calculated using height and weight with mathematical formulas. The Du Bois formula is the gold standard, while Mosteller (√(height×weight/3600)) is simpler and widely used in clinical practice.
How do you find the BSA?
To find BSA, measure your height and weight accurately, then apply a BSA formula. Our calculator does this automatically using 5 different formulas, providing comparisons and clinical context. Simply enter your height and weight to get instant results.
What is the best formula for BSA?
The Du Bois formula is considered the clinical gold standard, developed in 1916 and still widely used. Mosteller's formula is simpler and accurate for most adults. Haycock is preferred for pediatric patients. The best formula depends on the specific clinical application and patient population.
Is 1.94 BSA good?
A BSA of 1.94 m² is slightly above average for adults but can be normal for taller or larger individuals. Normal BSA ranges are 1.5-1.9 m² for women and 1.6-2.0 m² for men. 1.94 m² falls within typical ranges for many adult males.
What is normal BSA?
Normal BSA varies by age, gender, and body size: Newborns ~0.25-0.35 m², 1-year-olds ~0.4-0.55 m², 5-year-olds ~0.7-0.9 m², 10-year-olds ~1.0-1.3 m², adult women ~1.5-1.9 m², adult men ~1.6-2.0 m².