Kleiber's Law Metabolism Calculator
Estimate the basal metabolic rate and allometric lifespan of an animal from its body mass using Kleiber's 3/4 power law.
How to Use the Kleiber's Law Metabolism Calculator
- Enter body mass in kilograms.
- Click Calculate to see BMR and lifespan estimate.
Cas d'utilisation
- •Comparative physiology homework.
- •Zoo nutrition estimates.
- •Teaching allometric scaling.
Formule
BMR ≈ 70 · mass^0.75 (kcal/day). Lifespan (order of magnitude) ≈ 11.8 · mass^0.20 years.
Questions fréquemment posées
Is 70 universal?
The constant is the mammalian average. Birds, reptiles and ectotherms use different prefactors; the 3/4 exponent remains.
How accurate is the lifespan estimate?
Order of magnitude only. Actual lifespans depend on ecology, predation, metabolism, and species-specific biology.