Picture the scene. You are standing on the 86th-floor observation deck of the Empire State Building, more than 300 meters above Fifth Avenue, with Manhattan spread out below you like a model railroad layout. The wind tugs at your jacket. A tourist beside you fishes in a pocket, produces a copper-colored coin, and holds it over the edge. Everybody knows what happens next in the legend: the penny falls, and falls, and falls, picking up speed the whole way down until it strikes the sidewalk — or an unlucky pedestrian — with the force of a bullet.

It is one of the most repeated claims in all of popular science, shared at school lunch tables, on bus tours, and across the internet for decades: a penny dropped from the Empire State Building could kill a person. The story has everything a good urban legend needs. It is vivid, it is slightly transgressive, and it seems to follow from a real law of physics — things fall faster the farther they drop. The only problem is that it is wrong. Completely, thoroughly, and repeatedly tested wrong. Physicists have put pennies in wind tunnels. Television experimenters have fired them into ballistic gelatin. Engineers have simulated the impact on a supercomputer with a virtual crash-test dummy. Every one of these investigations reached the same conclusion: a falling penny is about as dangerous as a flick on the forehead.

*American currency, fanned out — but a two-and-a-half-gram penny behaves very differently in free fall than the legend suggests.*

Why the story feels true

The myth draws its strength from a genuine piece of physics that everyone learned in school: dropped objects accelerate. Release a stone from rest and gravity pulls it downward at about 9.8 meters per second squared, meaning it gets faster with every passing second. Drop something from high enough, the intuition goes, and it should arrive at the ground moving terrifyingly fast. A fall of several hundred meters sounds like it ought to turn even a small coin into a missile.

This intuition is not crazy. It is simply incomplete. It treats the air as if it were not there. And on Earth, the air is very much there.

Any object moving through a fluid — and air is a fluid — experiences drag, a force that pushes back against the motion and grows stronger as speed increases. A falling object accelerates only while gravity’s pull exceeds the drag pushing back. The moment the two forces balance, acceleration stops and the object settles into a constant speed called its terminal velocity. From that point on, it does not matter how much farther it falls: it will not go any faster. The height of the drop becomes irrelevant.

Terminal velocity is not one fixed number. It depends on the object’s mass, size, and shape. Heavy, compact, streamlined things cut through the air efficiently and reach high terminal velocities. Light, flat, broad things get held back. A skydiver in a spread-eagle position maxes out around 190 kilometers per hour; tucked into a head-down dive, the same person can exceed 480. A penny, it turns out, is about as far from a dart as a falling object can get.

A two-and-a-half-gram parachute

Consider what a modern American penny actually is. According to the United States Mint, pennies minted since 1982 weigh 2.5 grams, measure 19.05 millimeters across, and are just 1.52 millimeters thick. They are flat discs of zinc with a thin copper plating — almost all surface area and hardly any mass. In aerodynamic terms, that combination is about the worst possible recipe for falling fast.

Dropped from the edge of a skyscraper, a penny does not slice downward like a thrown dart. It tumbles. Almost immediately it begins flipping and fluttering, presenting its broad flat faces to the onrushing air — essentially acting as a tiny parachute. Calculations and experiments agree on what happens next: after roughly 15 meters of fall, about 50 feet, the tumbling penny reaches its terminal velocity of approximately 40 kilometers per hour, or 25 miles per hour. It then floats down the remaining hundreds of meters at that same gentle speed. The observation deck of the Empire State Building sits at about 373 meters; the roof is 381 meters and the antenna tip reaches 443 meters. But once the coin has fallen its first 15 meters, the other 350-plus meters add nothing at all to its speed.

To put 25 miles per hour in perspective: it is slower than a decent bicycle sprint, and a tiny fraction of the speed the legend imagines. The penny’s impact energy at that speed is roughly 0.15 joules — about what you feel from a light flick on the forehead. Researchers who study skull injuries have estimated that fracturing a human skull requires on the order of 68 joules of kinetic energy. The falling penny delivers less than one four-hundredth of that.

*An observatory dome against the sky — physicists and engineers who study motion through the atmosphere all agree on what drag does to a falling coin.*

The experiments that settled it

The penny myth has been tested more rigorously than most urban legends ever get. One of the most careful investigations came from Louis Bloomfield, a physicist at the University of Virginia, who studied the problem using wind tunnels and high-speed cameras. His finding, widely reported in science writing about the myth, was disarmingly simple: being struck by the penny would feel like a flick to the forehead — startling, perhaps slightly painful, but not remotely lethal.

Television got there too. In 2003, the science entertainment show MythBusters took on the penny-drop legend in its sixth episode. The hosts fired pennies at terminal velocity into a block of ballistics gel shaped like a human head, and then at a paving slab, to see what damage the coins could do. The result was the show’s most definitive category of debunking: busted. The pennies left no meaningful dent in either target.

More recently, engineers at Siemens ran the scenario through a full digital simulation as a demonstration of their modeling software. They modeled the penny’s free fall with computational fluid dynamics to extract the drag and terminal velocity — arriving at a maximum speed of about 38 miles per hour — and then simulated the impact on a virtual crash-test dummy using finite-element analysis software. The penny struck and bounced off the dummy’s head in less than a millisecond, exerting roughly 350 newtons of force. For comparison, the simulation’s authors noted, an average adult’s punch delivers around 1,000 newtons. The impact also produced a brief head-acceleration spike of about 7.5 g lasting half a millisecond; automotive crash tests, by contrast, look for head accelerations above 80 g sustained over several milliseconds before worrying about injury.

The Siemens team also cited a study from the Journal of Forensic Sciences finding that a pellet weighing the same as a penny would need to travel at roughly 168 miles per hour to break human skin. The simulated penny, at 38 miles per hour, was not even close to cutting the dummy’s scalp — the authors concluded it might leave a welt at worst. Three independent approaches — the physicist’s wind tunnel, the television ballistics test, and the supercomputer simulation — all converged on the same answer.

The vacuum daydream

There is a version of the legend that is true, and it is worth pausing on, because it reveals exactly where the myth goes wrong. Imagine dropping the penny in a vacuum, with no air at all. Then nothing would slow it down. From the 373-meter observation deck, a penny in free fall would accelerate at 9.8 meters per second squared all the way down and strike the ground at roughly 86 meters per second — about 192 miles per hour, nearly ten times faster than in air. That really would be dangerous.

*The Moon's airless surface, where a dropped coin really would keep accelerating — but New York City has an atmosphere.*

But New York is not the Moon. Our atmosphere is the whole story. The myth smuggles in vacuum physics and applies it to a world with air, and the error is invisible because the correction — drag — is something our everyday intuition handles poorly. Nobody has good instincts for fluid dynamics. We do, however, have good instincts for the penny’s real-world cousin: anyone who has watched a leaf flutter down from a tree has seen terminal velocity in action. A leaf falls from a great height and lands softly for exactly the same reason a penny does. It is light, it is broad, and the air holds it back.

The vacuum case is not purely hypothetical, either — astronauts have demonstrated it. During the Apollo 15 mission in July 1971, commander David Scott stood on the lunar surface and simultaneously dropped a geological hammer and a falcon feather from the same height. With no air to slow the feather, both struck the Moon’s dust at the same instant, exactly as Galileo’s physics predicts. It was a beautiful confirmation of the very principle the penny myth mangles: on an airless world, shape does not matter and everything really does keep accelerating. On Earth, shape is nearly everything, and the feather — like the penny — is at the air’s mercy.

There is another question the legend never invites you to ask, and it is a revealing one: how long does the fall actually take? If the penny really did keep accelerating, it would cover 373 meters in under nine seconds. In reality, after its brief 15-meter acceleration phase, it cruises downward at 40 kilometers per hour — about 11 meters per second — for the rest of the trip. That turns the plunge into a leisurely descent of roughly 34 seconds, more than half a minute of fluttering. The image of a coin screaming earthward like a missile dissolves the moment you do the arithmetic: the penny spends the overwhelming majority of its fall drifting, not diving.

One more subtlety deserves mention. In theory, a penny falling perfectly edge-on, like a tiny knife blade, could reach a terminal velocity around 25 meters per second — faster, though still far from lethal. In practice this never happens, because a real penny cannot hold that orientation. The slightest asymmetry in the airflow sets it tumbling, and once it tumbles it stays tumbling, presenting maximum surface area to the air for the entire fall.

What would actually be dangerous

Debunking the penny does not mean falling objects are harmless. The same physics that exonerates the coin condemns other objects, and the difference is instructive. What matters is the ratio of mass to aerodynamic drag. A ballpoint pen, for instance, is compact and relatively heavy for its size; its terminal velocity is around 70 miles per hour, and pens dropped from height are genuinely dangerous. So are golf balls, wrenches, and glass bottles. Construction sites treat dropped objects as a serious hazard for good reason: a two-kilogram wrench falling from scaffolding arrives with enough energy to kill, which is why hard hats, toe boards, and debris nets are mandatory on real job sites.

This is also why the myth’s advice-by-implication — that a coin is a weapon — gets the safety picture backwards. Dropping anything from a tall building is reckless and, in most cities, illegal. It is just not reckless in the specific way the legend claims. The Empire State Building’s observation decks are ringed with high protective barriers precisely to keep objects — and people — from going over. The danger of the stunt is real; the physics of the penny is not what makes it so.

Why the legend refuses to die

If the evidence is this one-sided, why does the story survive? Part of the answer is that it is a nearly perfect piece of folklore. It attaches a vivid consequence to a familiar place, it flatters the teller’s knowledge of physics, and its core mechanism — things speed up as they fall — is true enough to pass a casual plausibility check. Most people who repeat it have never thought about drag, and the correction requires thinking one step further than the intuition that produced the myth.

*The penny myth travels fastest through screens, repeated by people who never checked the physics behind it.*

The internet gave the legend a second life. Search for the question today and you will find confident assertions in both directions, explainer videos, and forum debates that run for hundreds of comments — the classic signature of a myth that feels true. It also benefits from a close cousin that is true and constantly gets conflated with it: hailstones. Large hail can indeed injure and kill, because a big ice chunk has far more mass relative to its surface area than a coin. Every news story about deadly hail quietly reinforces the penny myth, even though the physics is completely different.

There is a broader lesson here about intuitive physics. Human beings are notoriously bad at reasoning about motion through fluids, about exponential processes, and about anything where two competing forces reach an equilibrium. The penny myth is the poster child for this blind spot: our brains model the fall as acceleration without end, because the thing that ends it — the air itself — is invisible. The moment you make the invisible visible, the mystery dissolves. The coin was never a bullet. It was always a leaf.

The Verdict

False. A penny dropped from the Empire State Building cannot kill a person, crack a sidewalk, or do any serious damage at all. The coin weighs just 2.5 grams and tumbles as it falls, so air resistance caps its speed at roughly 40 kilometers per hour within the first 15 meters of descent — and it falls the remaining hundreds of meters no faster. Wind-tunnel experiments by physicist Louis Bloomfield, a 2003 MythBusters ballistics test, and a modern supercomputer impact simulation all agree the strike feels like a flick on the forehead, delivering about 0.15 joules against the roughly 68 joules needed to fracture a skull. The legend survives because it borrows real physics — dropped things accelerate — while quietly ignoring the air that stops the acceleration. On an airless world, the penny would indeed be deadly. On Earth, it is harmless. That said, do not throw anything off a skyscraper: heavier, more compact objects genuinely can kill, and the barriers on observation decks exist for good reason.

*City lights from orbit — even from a skyscraper's full height, a tumbling penny's fall ends at a gentle terminal velocity.*

So the next time someone on an observation deck solemnly warns you about the deadly penny, you can smile, enjoy the view, and set the record straight. The most dangerous thing about the legend was never the coin. It was the confidence with which everyone repeated it.