Body Surface Area Haycock Calculator
Calculate body surface area using the Haycock allometric equation, optimized for pediatric and infant clinical accuracy.
About the Haycock BSA Formula
The 1978 Haycock formula addresses surface-to-mass non-linearities in neonates, infants, and children, providing consistent accuracy across both pediatric and adult populations.
Formula
BSA (m²) = 0.024265 × Height (cm)0.3964 × Weight (kg)0.5378
Frequently Asked Questions
Why is Haycock favored in pediatric oncology?
The dataset sampled infants and children, avoiding the mathematical underestimation common to adult-derived formulas in smaller body masses.
Can Haycock be used for adult patients?
Yes. The regression curves scale smoothly across larger statures and body masses.
How does BSA normalize renal function?
Glomerular Filtration Rate is adjusted to a standardized surface area ($$\text{mL/min/1.73 m}^2$$) to enable meaningful comparisons across body sizes.
Does dehydration affect BSA output?
Short-term fluid changes cause small shifts in body weight, but height remains stable, so BSA changes are minimal compared to gross body weight.
Calculate in three steps
- 1Enter your valuesUse the fields above and check the units shown beside each input.
- 2Run the calculationSelect Calculate to refresh the result with your latest values.
- 3Review or shareCompare the result, reset the form, print it, or share this page.