Pediatric BSA Dose Calculator
Enter a child's height and weight to calculate BSA with Mosteller or DuBois formulas, then compute a drug dose in mg from a prescribed dose per m².
Patient Measurements
Leave blank to calculate BSA only.
Body Surface Area (BSA)
Mosteller
—
m²
DuBois
—
m²
Mosteller: √[(H cm × W kg) / 3600]. DuBois: 0.007184 × H0.725 × W0.425.
Formula Reference
Mosteller:
BSA = √[(height cm × weight kg) ÷ 3600]
DuBois:
BSA = 0.007184 × H0.725 × W0.425
Results are estimates. Protocol-specific BSA caps (e.g., 2.0 m²) are applied by the prescriber, not this tool.
Summary
Enter a child's height and weight to calculate BSA with Mosteller or DuBois formulas, then compute a drug dose in mg from a prescribed dose per m².
How it works
- Enter the child's height (cm or inches) and weight (kg or lb).
- Select the BSA formula: Mosteller (most common in pediatrics) or DuBois.
- The calculator computes BSA in m² using the chosen formula.
- Enter the prescribed dose in mg per m² (mg/m²).
- The tool multiplies BSA by the mg/m² dose to give the total dose in mg.
- Review both formula results side by side to compare estimates.
Use cases
- Calculate a chemotherapy dose for a pediatric oncology patient.
- Determine the correct methotrexate dose for a child based on BSA.
- Verify a prescribed BSA-based drug dose against your own calculation.
- Compare Mosteller vs DuBois BSA estimates for the same patient.
- Support pharmacokinetics coursework and clinical education.
- Estimate BSA-based dosing for immunosuppressant therapy in children.
- Double-check a dose before dispensing in a pediatric pharmacy.
- Teach the difference between mg/kg and mg/m² dosing paradigms.
Frequently Asked Questions
Last updated: 2026-07-24 ·
Reviewed by Nham Vu