Body Surface Area Calculator
Estimate body surface area from height and weight using common clinical formulas.
Calculate BSA
cm
kg
Body surface area calculator guide
WeCovr's body surface area calculator estimates BSA from height and weight using common clinical formulas such as Mosteller and Du Bois. It is useful for educational understanding of a measurement commonly referenced in medicine and dosing discussions.
What body surface area means
Body surface area is an estimate of the external surface of the human body, expressed in square meters.
It is commonly used in some medical contexts because it can sometimes be a more useful scaling measure than body weight alone.
Expressed in square meters.
Estimated from height and weight.
Often referenced in clinical settings.
Why there are multiple BSA formulas
Different formulas were developed from different data and assumptions, so small differences between methods are normal.
Mosteller is widely used for its simplicity, while Du Bois is another commonly cited classic formula.
How to use BSA estimates responsibly
BSA is best treated as an educational estimate unless you are working directly with a clinician. Medical interpretation and dosing decisions should always remain professional judgments.
Common BSA formulas
| Formula | Typical appeal | Why people use it |
|---|---|---|
| Mosteller | Simple and popular | Quick estimation from height and weight |
| Du Bois | Classic reference method | Used for comparison in some settings |
| Other formulas | More specialised | May be used in specific clinical contexts |
Related WeCovr resources
FAQs
Is BSA the same as BMI?
No. BMI is a weight-for-height screening metric, while BSA estimates body surface area in square meters.
Why do Mosteller and Du Bois give slightly different answers?
Because they are different formulas built from different assumptions and data, so small differences are normal.
Should I use this calculator for medical dosing decisions?
No. This calculator is for general information and education only. Clinical dosing decisions should be made by qualified professionals.
Get your score
Get your free Protection Score
Check how protected you are, spot the biggest gaps, and then decide what to do next.
Answer a few quick questions
See where your biggest protection gaps may be
Move into the right next step if you want help
What you get
A quick view of your current protection position
A clearer idea of where the biggest gaps may be
A direct route to tailored help if you want it