This may be a stupid question then, but would it not be mathematically possible to measure the mads needed to create a black hole by using escape velocity as the determination, I mean Earth has a mass of 1 let’s say and an escape velocity of x, then just determine how much more mass it would take to make the escape velocity C???
It’s not mass that is needed as much as a density; that is, a combination of mass and volume. The earth would form a black hole if it was crushed to about 0.7 inches across. But that would of course require an almost impossible amount of energy. Such energy is found in the gravitation potential of very large stars, however. But their event horizon is at least a few miles across, not just 0.7 inches.