How many suns does a black hole equal?

Not necessarily. Black holes are big and small.

The mass of a black hole doesn't have to be big, as long as its gravity can "trap" light. The mass of a black hole formed by the gravitational collapse of a star is more than 3.2 times that of the sun. This lower mass limit is called Oppenheimer-volkov limit. It is also the highest mass among neutron stars. That is to say, if it is less than this critical mass, when the star collapses, it cannot form a black hole, but only a neutron star.

Black holes can also be very massive. For example, the mass of a black hole in the center of a galaxy is hundreds of thousands to millions of times that of the sun. The mass of the black hole in the center of the Milky Way is about 4.3 million times that of the sun, while the mass of the black hole in the center of M87 galaxy is about 6.4 billion times that of the sun.

The mass of a black hole may also be very small. Scientists speculate that the miniature black hole formed in the early days of BIGBANG may weigh only a few hundred thousand tons to several million tons, which is only equivalent to a mountain on the earth, and its size is only equivalent to a basic particle. So it is also called quantum black hole.