S = πAkc³/2hG

S = Entropy of a Black Hole
A = Area of the Event Horizon
k = Boltzman’s Constant
c = Speed of Light
h = Planck’s Constant
G = Newton’s Constant
G = 6.674 08 x 10⁻¹¹ m³·kg⁻¹·s⁻²
h = 6.626 075 5 x 10⁻³⁴ J·s
h = 4.135 669 2 x 10⁻¹⁵ eV·s
k = 1.380 658 x 10⁻²³ J/K
k = 8.617 385 x 10⁻⁵ eV/K
c³ = 2.69440024 × 10²⁵ m³/s³

Entropy of a Black Hole

To calculate A the Area of the Event Horizon, A can be calculated….
Black Hole Parameters

What is a cross section?

Classical and Quantum Black Hole Cross Section

Total Destructive Interference Nodal Points and Dark Matter

Short Wavelength High Energy Length Contracted Electron Cross Section(s)


Phillip Freeman has a good answer to the question…
What is an annihilation cross section?

The case for mini black holes
12 November 2004

…and finally, I decided to ask quora users for more information, due to numerous conflicting results. I hope that this helps you understand and be able to accurately calculate the entropy of a black hole, for a referrence and as a study tool…
“Can you recommend a good source of information for calculating the entropy of a black hole, with examples worked out step by step?”

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