There is a related concept, the Planck Mass that also involves the 3 most fundamental constants in nature, the speed of light the Planck constant and the Gravitational constant. If you take the Planck energy (c^5*h/2*PI*G)^1/2 and confine it in a box one Planck length (G*h/2*PI*c^3)^1/2 on a side it will turn into a Black Hole. To find the Planck Mass we use E=MC^2 and divide the Planck Energy by c^2. The Planck Mass works out to be .02 milligrams, about the mass of a single grain of salt; nothing less massive than the Planck Mass can form a Black Hole regardless of how much you compress it. Some, such as Roger Penrose, think this marks the boundary between the quantum realm and the realm of classical physics but most think that's a oversimplification.
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