Black hole size compared to sun
Pro Research Analysisby 
Searched over 200M research papers
Black Hole Mass Compared to the Sun
Black holes come in a wide range of sizes, but many of the black holes found in our galaxy are known as "stellar-mass black holes." These typically have masses several times greater than that of our Sun. For example, some observed black holes have masses about 3.6 times the mass of the Sun, while others detected through gravitational wave events have been found with masses of 8, 14, or even up to 21 times the mass of the Sun after merging events Corral-Santana2013Garfinkle2017.
Range of Black Hole Sizes: From Stellar to Supermassive
Stellar-mass black holes, which are the remnants of massive stars, usually form from stars that were originally more than 20 to 30 times the mass of the Sun. Most of these black holes end up with masses between a few and several tens of solar masses . There have been rare claims of black holes with masses as high as 70 times the mass of the Sun, but further analysis suggests that these extreme cases are likely overestimates, and more typical black hole masses in such systems are between 4 and 7 times the mass of the Sun Banerjee2019Pápics2020Eldridge2019.
Intermediate-mass black holes, which are much rarer and harder to detect, can have masses ranging from about 100 to 100,000 times the mass of the Sun. Supermassive black holes, found at the centers of galaxies, can be millions or even billions of times more massive than the Sun .
Physical Size: Event Horizon Compared to the Sun
The "size" of a black hole is usually described by its event horizon, also known as the Schwarzschild radius. For a black hole with the same mass as the Sun, the event horizon would be about 3 kilometers in radius, which is much smaller than the Sun's actual radius of about 700,000 kilometers. As the mass of the black hole increases, the event horizon grows proportionally, but even a black hole with 10 times the Sun's mass would have an event horizon of only about 30 kilometers—still tiny compared to the Sun's size .
Special Cases: Black Holes Inside Stars
There are also theoretical scenarios where a black hole could exist inside a star, such as the Sun. If a small black hole were at the center of the Sun, it would have very little effect unless it grew to a significant fraction of the Sun's mass. In such cases, the black hole could eventually consume the star, but this is not believed to be the case for our Sun .
Conclusion
In summary, most black holes found in our galaxy have masses several times greater than the Sun, but their physical size (event horizon) is much smaller than the Sun's radius. While there are rare cases of more massive black holes, the typical range for stellar-mass black holes is between 3 and 20 times the mass of the Sun, with intermediate and supermassive black holes being much larger in mass but still much smaller in physical size compared to the Sun.
Sources and full results
Most relevant research papers on this topic