There are Four Different Types of Black Holes: Stellar, Intermediate, Supermassive and Primordial Black Holes.
Stellar black holes are the most common type of black holes. They have about 5 to 100 times greater in mass than the Sun and can range in 10 to 20 miles in diameter. The black hole are normally found after the death of large stars.
Intermediate black holes have not been discovered yet, but many astronomers believe that they exist. They are believed to be 1000 times greater in mass than the Sun. There have been many claims of intermediate black hole discover but none have been proved yet.
Supermassive back holes are the largest of all black holes. they are usually found at the center of galaxies, including our own Milky Way galaxy. They have mass 1 million to several billion times greater in mass than the Sun, and are as large as our solar system.
Primordial or miniature black holes have not yet been proven by scientists. They are believe to created in the early times of the Universe. Scientists believe that primordial black holes can be as small as a single atom but with the mass of a mountain.