If all black holes are made up of an infinitely small point with infinite density, why are there “big” black holes and “small” black holes?

Question

If all black holes are made up of an infinitely small point with infinite density, why are there “big” black holes and “small” black holes?

In: 2

Answer 1

The “infinitely small/dense” refers to its volume. It’s mass, however, is finite, and different black holes can be have different masses.

It is its mass that determines its event horizon which is what we are talking about when we reference the “size” of a black hole. It is this invisible barrier beyond which nothing can escape.