Body Surface Area (BSA) Calculator

Meeh-type allometry: BSA = K · Weight2/3. Species constants with references [1–6].
Model: Meeh (allometric)
Enter weight; units auto-switch by species (kg for Dog/Cat/Rabbit/Ferret; g for Mouse/Rat).
Field Input
Species K = 0.101
Weight
Auto-switch by species
Precision
Mouse/Rat default: m²=5, cm²=0
Result
BSA: — m²
(— cm²)
Formula: K·W^(2/3)
Notes: The Meeh constant K varies with species, body composition, and size. Values below are typical reference values; clinical contexts may warrant species-specific or study-specific coefficients.

Species Constants & Sources

  1. Dog: K = 0.101. Owen O. Handbook of Canine and Feline Clinical Nutrition. 1st ed. Waltham; 1980.
  2. Cat: K = 0.100. Sobczyk K, et al. Allometric relations in domestic cats. J Small Anim Pract. 2005;46(5):240–4.
  3. Rabbit: K = 0.090. Quesenberry KE, Carpenter JW, editors. Ferrets, Rabbits, and Rodents: Clinical Medicine and Surgery. 3rd ed. St. Louis: Elsevier; 2012.
  4. Ferret: K = 0.100. Rosenthal KL, Peterson ME. Ferret medicine and surgery. In: Quesenberry KE, Carpenter JW, editors. Ferrets, Rabbits, and Rodents. 3rd ed. St. Louis: Elsevier; 2012.
  5. Rat: K = 0.090. Davies B, Morris T. Physiological parameters in laboratory animals. Pharm Res. 1993;10(7):1093–5.
  6. Mouse: K = 0.090. Reagan-Shaw S, Nihal M, Ahmad N. Dose translation between animals and humans. FASEB J. 2008;22(3):659–61.
Formula basis: Meeh allometry. For comparison with dose scaling using body surface area factors (Km), see reference 6.

Formulae

  1. Meeh allometric relation: BSA (m²) = K · weight(kg)2/3.
  2. Unit handling here: if input in grams (g), internally converted to kilograms before applying the formula.
  3. Area conversion: 1 m² = 10,000 cm².
Ver 1.0 edited by dvmlai, 20250820