Pediatric Body Surface Area (BSA) Calculation Tool
Pediatric BSA Calculator
Body Surface Area Assessment Tool for Clinical Practice
Patient Information
Measurements
Select BSA Formula
Mosteller
Most widely used
DuBois
Historical standard
Haycock
Pediatric preferred
Gehan-George
Cancer therapy
BSA Calculation Results
0.00 m²
Formula Comparison & Clinical Applications
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Mosteller Formula
BSA = √[(Height × Weight) / 3600]
Advantages
- Simplest calculation
- Most widely accepted
- Validated for all ages
- Easy to remember
Limitations
- Less accurate for extremes
- May underestimate in obesity
Clinical Use: General pediatric dosing, chemotherapy, fluid management
DuBois Formula
BSA = 0.007184 × H^0.725 × W^0.425
Advantages
- Historical standard
- Extensively validated
- Good for adults
Limitations
- Complex calculation
- May overestimate in children
- Less accurate for premature infants
Clinical Use: Research studies, metabolic calculations
Haycock Formula
BSA = 0.024265 × H^0.3964 × W^0.5378
Advantages
- Most accurate for children
- Validated in neonates
- Preferred for pediatrics
- Accurate for low weights
Limitations
- Complex calculation
- Less known by clinicians
Clinical Use: Neonatal intensive care, pediatric oncology
Gehan-George Formula
BSA = 0.0235 × H^0.42246 × W^0.51456
Advantages
- Accurate for cancer patients
- Validated in chemotherapy
- Good for varying body types
Limitations
- Less common in routine practice
- Complex calculation
Clinical Use: Pediatric oncology, chemotherapy dosing
Reference Values & Interpretation
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| Age | Average BSA (m²) | Normal Range (m²) | Clinical Notes |
|---|---|---|---|
| Premature | 0.15 | 0.10 - 0.20 | Use actual gestational age |
| Newborn | 0.25 | 0.20 - 0.30 | Term infants (37-42 weeks) |
| 3 months | 0.35 | 0.30 - 0.40 | Rapid growth phase |
| 6 months | 0.40 | 0.35 - 0.45 | Weight typically doubles |
| 12 months | 0.45 | 0.40 - 0.50 | Weight typically triples |
| 3 years | 0.62 | 0.55 - 0.70 | Toddler growth assessment |
| 5 years | 0.78 | 0.70 - 0.85 | Pre-school age |
| 10 years | 1.14 | 1.00 - 1.30 | Pre-pubertal phase |
| 15 years | 1.60 | 1.40 - 1.80 | Approaching adult values |
| Adult | 1.73 | 1.50 - 2.00 | Standard reference |
Clinical Notes & Disclaimer
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Clinical Best Practices
- Always verify calculations manually for critical applications
- Consider clinical context when interpreting BSA values
- Use age-appropriate reference ranges
- Serial measurements provide better clinical insight
- Document formula used for consistency
Medical Disclaimer
- For healthcare professionals only
- Results should not replace clinical judgment
- Consult institutional protocols for drug dosing
- Verify critical calculations with multiple methods
- Educational and reference purposes only