Body Surface Area Calculator
Calculate your body surface area in square meters using Mosteller and Du Bois formulas. Free BSA calculator for medical dosing.
BSA is used in medicine to dose chemotherapy, adjust renal clearance and index cardiac output.
Frequently asked questions
- What is body surface area used for?
- Dosing certain medications (especially chemotherapy), calculating fluid requirements and indexing heart and kidney function.
- Which formula is most common?
- Mosteller, because it is simple and accurate: the square root of height times weight divided by 3600.
- How accurate are these formulas?
- They agree within a few percent for most adults. Extremes of body shape can differ more.
- Can I dose medication from this?
- No. This is an educational estimate. All medication dosing must be confirmed by a pharmacist or doctor.
This tool runs entirely in your browser. No data is uploaded anywhere.