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The Bekenstein-Hawking entropy of black holes in Einstein's theory of gravityis equal to a quarter of the horizon area in units of Newton's constant. Waldhas proposed that in general theories of gravity the entropy of stationaryblack holes with bifurcate Killing horizons is a Noether charge which is ingeneral different from the Bekenstein-Hawking entropy. We show that the Noethercharge entropy is equal to a quarter of the horizon area in units of theeffective gravitational coupling on the horizon defined by the coefficient ofthe kinetic term of specific graviton polarizations on the horizon. We presentseveral explicit examples of static spherically symmetric black holes.

Wald's entropy is equal to a quarter of the horizon area in units of the effective gravitational coupling