⚕️ Body Surface Area Calculator
Calculate body surface area using height and weight measurements with support for Mosteller and Du Bois formulas, commonly used in medical contexts for drug dosage determination.
⚕️ Calculate Body Surface Area
Enter your height and weight to calculate body surface area:
⚕️ Understanding Body Surface Area
Body Surface Area (BSA) is a measurement of the surface area of the human body, commonly used in medicine for calculating drug dosages, assessing metabolic mass, and determining treatment protocols.
🧮 BSA Calculation Formulas
📐 Mosteller Formula
BSA = √(height × weight / 3600)
Simple and widely used
Height in cm, weight in kg
Good for general calculations
🔬 Du Bois Formula
BSA = 0.007184 × height^0.725 × weight^0.425
More complex calculation
Considered more accurate
Used in research settings
📏 Haycock Formula
BSA = 0.024265 × height^0.3964 × weight^0.5378
Used for pediatrics
More accurate for children
Complex coefficients
⚖️ Gehan & George Formula
BSA = 0.0235 × height^0.42246 × weight^0.51456
Variation of Du Bois
Used in specific contexts
Slightly different exponents
💊 Medical Applications
🩺 Chemotherapy Dosing
Many cancer drugs dosed by BSA
Reduces toxicity risks
Personalized treatment
Standard in oncology
💉 Drug Dosage Calculation
Antibiotics and antivirals
Cardiovascular medications
Some pediatric drugs
Metabolic calculations
🔬 Metabolic Assessment
Basal metabolic rate
Calorie requirements
Nutritional assessment
Energy expenditure
🏥 Burn Treatment
Assess burn severity
Fluid resuscitation
Calculate replacement needs
Monitor treatment progress
⚠️ Medical Disclaimer: This calculator is for educational purposes only. BSA calculations should be performed by qualified healthcare professionals for actual medical use. Always consult with a physician for drug dosing and treatment decisions.
📊 BSA Reference Ranges
👶 Infants & Children
0.2 - 0.5 m² for infants
0.5 - 1.0 m² for children
Higher relative to weight
Grows rapidly with age
🧑 Adults
1.2 - 2.2 m² typical range
1.6 - 1.9 m² average
Men slightly higher than women
Stable in adulthood
📏 Body Size Variations
Taller people have higher BSA
Heavier people have higher BSA
Both dimensions matter
Non-linear relationship
⚖️ Clinical Interpretation
Below 1.2 m² may be small
Above 2.2 m² may be large
Used for dose adjustments
Individual variation exists
🔬 Scientific Basis
🧬 Physiological Foundation
Surface area relates to metabolism
Drug clearance through skin
Heat dissipation capacity
Nutrient absorption
📈 Scaling Laws
Metabolic rate scales with BSA
Drug dosing scales with BSA
Organ function correlates
Size-dependent physiology
🧪 Experimental Validation
Developed from measurements
Validated against metabolism
Correlated with organ size
Clinical trials support use
📊 Statistical Methods
Regression analysis used
Height and weight data
Population studies
Cross-validation techniques
⚕️ Clinical Considerations
🎯 Individual Variation
Body composition affects BSA
Muscle vs fat differences
Age-related changes
Disease state modifications
📏 Measurement Accuracy
Height measurement precision
Weight scale calibration
Posture and timing
Clothing considerations
🔄 Formula Selection
Mosteller for general use
Du Bois for research
Population-specific formulas
Context-dependent choice
⚠️ Limitations
Not perfect for all drugs
Individual responses vary
Other factors influence dosing
Clinical judgment required