What would you weigh near a black hole?
Black hole gravity behaves strangely. The biggest black holes have surprisingly gentle surface gravity, while the smallest ones tear you apart from far away. Enter your weight, pick a black hole, and see how distance plus mass produce results that contradict every intuition.
Your weight:
Black hole type:
🕳️ Your weight
582,893 lbs
3,886 times Earth's gravity at this distance
Distance from event horizon:
10.0× the event horizon distance
🍜 Difference in pull between your head and feet
Barely measurable
Less than 1% of Earth's gravity. You wouldn't feel it.
Survivable. You'd feel only a faint stretch.
Calculations use Newtonian physics for clarity. Black hole gravity uses general relativity, which gets stranger as you approach the event horizon. The trends shown here are accurate; the exact numbers are approximations.
Why does your weight change near a black hole?
Gravity follows an inverse square law: it gets four times stronger when you halve the distance, nine times stronger when you cut the distance in thirds. Near a black hole, that scaling produces absurd numbers fast. At one kilometer from a stellar black hole's event horizon, your weight is roughly 100 billion times your weight on Earth.
But weight isn't actually what kills you. Tidal forces do. Because gravity weakens with distance, the gravity pulling on your feet (closer to the black hole) is stronger than the gravity pulling on your head. The difference stretches you out. Near small black holes, this stretching becomes lethal long before you cross the event horizon. Physicists call it spaghettification, and it's exactly as bad as it sounds.
FAQ:
Why don't bigger black holes have stronger gravity?
They do, but you can't get as close to the mass. A black hole's event horizon scales directly with its mass, so the gravity at the horizon itself stays roughly constant across all sizes. What changes dramatically is the tidal gradient, which is much gentler for bigger black holes.
How accurate is this calculator?
The trends are accurate, but the exact numbers are approximations. Real black hole physics requires general relativity, which gets weird near the event horizon. For visualizing how dramatically gravity scales near a black hole, this calculator does the job.
Why are stellar black holes more dangerous than supermassive ones?
Counterintuitively, smaller black holes have stronger tidal forces near their event horizons. Stellar black holes (~10 solar masses) would tear you apart long before you reached the horizon. Supermassive ones like Sagittarius A* have such gentle tidal gradients that you could theoretically cross the event horizon intact.
What would actually happen if you fell into a black hole?
For a stellar black hole, you'd be spaghettified into a thin strand of atoms before reaching the horizon. For a supermassive black hole, you'd cross the horizon alive but couldn't escape, and would eventually be torn apart deeper inside. Either way, no return.
Why is TON 618 included?
TON 618 is one of the largest known black holes in the universe, with about 66 billion times the mass of the Sun. Including it shows the extreme upper end of what gravity can produce. Most black holes you read about are millions to billions of times less massive.
How close can you actually get to a black hole safely?
Depends entirely on the black hole's mass. For Sagittarius A*, you could theoretically fly within a few thousand kilometers of the event horizon and survive briefly. For a small stellar black hole, you'd be dead from tidal forces while still hundreds of kilometers away.
Want to go deeper?
If a black hole's gravity warped your weight in interesting ways, the physics behind it is even wilder. Each of these articles pairs naturally with what you just calculated.
What is a Black Hole?
The foundational article covering what black holes actually are and how they form.
What Happens if You Fall into a Black Hole?
The full spaghettification story in vivid detail.
What is the Biggest Black Hole?
Meet TON 618 and the other ultramassive monsters.
Is there a Black Hole at the Center of Our Galaxy?
Sagittarius A*, the supermassive black hole closest to you right now.
How are Black Holes Formed?
Where these gravity wells come from in the first place.
What is Gravity?
The foundational physics behind why distance and mass matter so much.
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Black hole mass figures from NASA's black holes overview. Tidal force math based on standard Newtonian gravitational approximations.