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How Big Is Sagittarius A*?

Sagittarius A* is about 15,800,000 miles (25,400,000 km) across. That is about 14.9 billion times as wide as the average man is tall. The supermassive black hole at the center of the Milky Way.

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How big is Sagittarius A* compared to the average man?

Sagittarius A* is about 14.9 billion times as wide as the average man is tall. Sagittarius A* is 14.9 billion× the size of the average man: about 14.9 billion average men lined up would match it.

Sagittarius A* (Black Hole) size facts

Its event horizon is about 25 million km across, about 18 times wider than the Sun.
It has about 4.3 million times the mass of the Sun.

How does Sagittarius A* compare to other things?

Sagittarius A* next to 23 things of similar size, plus some everyday references:

Thing	Size	Compared to Sagittarius A* (black hole)
TON 618 (black hole)	1,600 AU across	9,450× bigger
Solar System	60.2 AU across	354× bigger
VY Canis Majoris	13.2 AU across	78× bigger
Betelgeuse	7.09 AU across	41.7× bigger
Rigel	0.735 AU across	4.3× bigger
Sirius A	1,480,000 miles (2,380,000 km) across	10.7× smaller
Sun	865,000 miles (1,393,000 km) across	18.2× smaller
Proxima Centauri	134,000 miles (215,000 km) across	118× smaller
Jupiter	86,900 miles (139,800 km) across	182× smaller
Saturn	72,400 miles (116,500 km)	218× smaller
Uranus	31,500 miles (50,720 km) across	501× smaller
Neptune	30,600 miles (49,240 km) across	516× smaller
Earth	7,920 miles (12,740 km) across	1,990× smaller
Venus	7,520 miles (12,100 km) across	2,100× smaller
Mars	4,210 miles (6,779 km) across	3,750× smaller
Mercury	3,030 miles (4,879 km) across	5,210× smaller
Moon	2,160 miles (3,475 km) across	7,310× smaller
Pluto	1,480 miles (2,377 km) across	10,700× smaller
Mount Everest	5.5 miles (8.849 km)	2.87 million× smaller
Eiffel Tower	1,083 ft (330 m)	77 million× smaller
School bus	40 ft (12.2 m) long	2.08 billion× smaller
Average man (world)	5 ft 7 in (171 cm)	14.9 billion× smaller
Average woman (world)	5 ft 3 in (159 cm)	16 billion× smaller

Where do these numbers come from?

Sizes are typical adult or reported values, rounded for readability. Read how we measure and compare sizes.