Clinical
Haycock formula
A later fit that performs well across a wide range of body sizes.
The Formula
BSA = 0.024265 x height^0.3964 x weight^0.5378
A later fit that performs well across a wide range of body sizes.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| BSA | Body surface area | m^2 | The result, in square metres. |
| 0.024265 | Constant | unitless | The Haycock coefficient. |
| 0.3964, 0.5378 | Exponents | unitless | Height and weight exponents. |
What Each Symbol Means
BSAm^2
Body surface area
The result, in square metres.
0.024265unitless
Constant
The Haycock coefficient.
0.3964, 0.5378unitless
Exponents
Height and weight exponents.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate body surface area page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Calculate Body Surface Area, filed under Health. Every number the guide produces comes from substituting into this one line.