Pharmacy tools
BSA Calculator
Estimate body surface area (m²) with the Mosteller formula from height and weight.
- Mobile Friendly
- Accessibility Tested
- Formula Verified
- SEO Optimized
- Fast Loading
- Responsive
Version 1.0.0 · Last reviewed
Tool
Result
Live output from your inputs
Enter values and calculate to see results.
How it worksShow guideHide guide
Introduction
Estimate adult/pediatric body surface area with the Mosteller formula. BSA is often used when dosing is ordered per m² — always confirm the protocol and capping rules clinically.
Disclaimer: This tool is for informational purposes only and is not professional medical, pharmaceutical, financial, or tax advice. Always verify doses with a licensed clinician or pharmacist.
Formula
Mosteller body surface area uses the square root of height (cm) times weight (kg) over 3600, giving square meters.
- h_cm — Height in centimeters
- w_kg — Weight in kilograms
Step-by-step
- Enter height in centimeters.
- Enter weight in kilograms.
- Read BSA in square meters.
Worked example
A 170 cm, 70 kg patient has BSA ≈ √((170×70)/3600) ≈ 1.82 m².
Use cases
- Estimate BSA before reviewing a per-m² order
- Teach Mosteller BSA pharmacy math
- Cross-check oncology or specialty dosing prep worksheets
Frequently asked questions
Why Mosteller?
It is widely taught, simple, and commonly accepted for quick estimates. Some protocols specify DuBois or other equations — follow the order set.
Is BSA alone enough to dose?
No. Multiply by the ordered mg/m² only when authorized, and apply renal, hepatic, and protocol limits.
Related tools
Dosage Calculator
Calculate a weight-based drug dose (mg/kg) and daily total from patient weight and frequency.
Pediatric Dose Calculator
Estimate pediatric doses with Clark's rule, Young's rule, or mg/kg weight-based dosing.
BMI Calculator
Calculate Body Mass Index (BMI) from height and weight, and see the WHO adult category.
Popular tools
Days Supply Calculator
Calculate prescription days supply from quantity dispensed, dose amount, and doses per day.
Dilution Calculator
Use C₁V₁ = C₂V₂ to find how much stock and diluent you need for a target concentration and volume.
IV Drip Rate Calculator
Calculate IV pump rate (mL/hr) and gravity drip rate (gtt/min) from volume, time, and drop factor.
Was this helpful?
Your feedback stays on this device only — it is not sent to the Bestrao team yet.