Black Hole's Weight?

Black hole weight classes, The standard black hole, known as a stellar-mass black hole, forms when a massive star (greater than about 8 solar masses) reaches the end of its life. After depleting the last of its remaining nuclear fuel, the star’s uncontested gravity causes it to rapidly collapse before rebounding outward in an epic blast known as a supernova.

What remains, depending on the mass of the star, will either be a neutron star or a black hole. These stellar-mass black holes can range from a couple to several dozen times the mass of the Sun. However, the origins of supermassive black holes like Sagittarius A*, which can range from millions to billions of times the mass of the Sun, remain unknown. Astronomers do know their extreme size and mass seems to be related to the galaxies they call home, with the biggest supermassive black holes found in the centers of the biggest galaxies. This line of evidence — as well as recent evidence for a theorized class of mid-sized black holes called intermediate-mass black holes (which range from hundreds to a million solar masses) — seems to suggest that supermassive black holes might get their heft after countless stellar-mass and intermediate-mass black holes merge together over the eons. And although it’s clear that different types of black holes can dramatically vary in mass, it’s less obvious how much they vary in size.