Worked example: Body Surface Area Calculator
Mosteller 180cm 80kg. This fixed reference example shows one complete scenario; the interactive results above use your current inputs.
View the example inputs
- Measurement units
- Metric
- Body weight
- 80 kg
- Height
- 180 cm
| Calculated quantity | Example result |
|---|---|
| Estimated body surface area | 2 m² |
Making sense of body measurements and reference estimates
Measure consistently before interpreting a ratio
A measurement-based calculation can only be as consistent as its inputs. Height, weight and circumferences use different units and measurement sites. Recheck the units and the requested anatomical measurement before comparing two results. A circumference formula cannot be substituted for a laboratory or imaging measurement.
Ratios such as BMI or waist-to-height summarize selected dimensions. They do not describe every aspect of body composition, and a reference category does not by itself establish a diagnosis. An equation can fit its reference population differently from an individual user.
Read the scope beside the result
Adult screening boundaries do not automatically apply to children, pregnancy or every clinical situation. A body-fat estimate and a measured body-fat percentage can differ. The formula notes identify the method and the scope explains where it should not be used.
Use the example to check the calculation and the linked reference to understand the method. Interpret the number alongside the relevant medical, fitness or measurement context rather than treating additional decimal places as additional certainty.
Formula and calculation method
BSA(m²)=sqrt(height(cm)×weight(kg)/3600).
Scope and Limitations
- An estimate, not a medication-dose recommendation. Use clinician-confirmed measurements and dosing protocols for clinical decisions.
Reference Sources
Frequently asked questions
How does this calculator work?
BSA(m²)=sqrt(height(cm)×weight(kg)/3600).
What assumptions should I check?
An estimate, not a medication-dose recommendation. Use clinician-confirmed measurements and dosing protocols for clinical decisions.
Can I save or print this calculation?
Use Copy link with inputs to reproduce the scenario, Download results for a text record, or Print. Where a schedule is shown, its CSV download includes every row.
What happens when I change measurement units?
The linked unit selector converts the existing measurement so it represents the same physical quantity. Entering a different number after switching units changes the underlying input. The result’s own units are shown beside its value.