Complete guide
Body Surface Area Calculator: formula, worked example and interpretation
Estimate body surface area with the Mosteller height-and-weight formula. Enter the known values and the result updates instantly with an auditable breakdown.
What the Body Surface Area Calculator answers
Estimate body surface area with the Mosteller height-and-weight formula.
Use the breakdown to compare the result with the source values before making a decision.
Formula and variables
The calculation uses BSA=√(height cm×weight kg/3600). Every variable comes directly from a labeled field.
BSA=√(height cm×weight kg/3600)Worked example
At 170 cm and 70 kg, the Mosteller estimate is about 1.82 m².
Changing any field recalculates the result immediately, so nearby scenarios can be compared without reloading the page.
How to use the result
Treat the result as a planning value and compare it with the detailed rows shown beside it.
Keep units and time periods consistent. Use the share or PDF action to preserve the exact assumptions.
Assumptions and scope
BSA is an estimate and medication dosing must follow the prescriber's protocol, patient data and clinical judgment.
The calculator exposes its assumptions instead of filling missing facts with hidden estimates.
Accuracy checks
Confirm the units, dates, rates and source figures before relying on the output.
Round only the displayed answer; Calculator24 keeps full JavaScript precision for intermediate arithmetic and exported values.
Input and output checklist
| Item | What to enter or review |
|---|---|
| Inputs | Units, Height (cm or inches), Weight (kg or lb) |
| Equation | BSA=√(height cm×weight kg/3600) |
| Example | At 170 cm and 70 kg, the Mosteller estimate is about 1.82 m². |
| Limit | BSA is an estimate and medication dosing must follow the prescriber's protocol, patient data and clinical judgment. |
Frequently asked questions
What does this Body Surface Area Calculator calculate?
Estimate body surface area with the Mosteller height-and-weight formula.
Which formula does it use?
BSA=√(height cm×weight kg/3600)
Does the result update while I type?
Yes. Valid changes recalculate after a short delay and the previous result is not substituted for invalid input.
Which assumptions should I check?
Check units, rates, dates and every source value shown in the form.
Is the result exact?
BSA is an estimate and medication dosing must follow the prescriber's protocol, patient data and clinical judgment.
Can I save or share the calculation?
Yes. Copy, Share, WhatsApp, PDF/Print, CSV, comparison and parameterized-link actions are available.
What to keep in mind
BSA is an estimate and medication dosing must follow the prescriber's protocol, patient data and clinical judgment.
Results display up to 8 decimal places; exported numbers preserve calculation precision. This is a calculation summary, not an official certificate.