Metabolic Scaling Laws
Kleiber's Law: B ∝ M^(3/4) — from mouse to whale
Parameters
Exponent α:
0.75
Prefactor B₀:
70
W/kg^α
Your Animal
Mass M:
70
kg
Custom animal
Mass:
70 kg
BMR:
--
W
Specific:
--
W/kg
Lifespan est:
--
yr
Toggle log/linear
B = B₀ · M^α
Heartbeats ≈ const · M^(−1/4)
Lifespan ≈ const · M^(1/4)
Kleiber's Law (1932): metabolic rate scales as M^0.75 across 20+ orders of magnitude. WBE model (West-Brown-Enquist 1997) derives 3/4 from fractal nutrient networks.