# Entropy of a Black Hole Calculator

The Entropy of a Black Hole calculator computes the entropy of black hole in joule per kelvin based on the given mass of a black hole in kg.

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S = $\frac{8\pi^{2}GM^{2}k}{hc}$

Entropy (S):

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## Instructions to Use

• Enter the mass of the black hole in kg.
• If mass is “2 x $10^{30}$ kg”, then just type “2e+30”.
• If your result is “1.4E+54 J/K” then it is equal to “1.4 x $10^{54}$ J/K”

S = $\frac{8\pi^{2}GM^{2}k}{hc}$

Here,

• M is the mass of the black hole
• G is the Gravitational constant
• h is the plank’s constant
• c is the speed of light
• k is Boltzmann’s constant