Why Pennies Dropped from Skyscrapers Can’t Kill You

By Trivia Daily, Staff Writer — Published July 27, 2026

Table of Contents

• Key Takeaways
• The Science Behind Pennies Dropped from Skyscrapers
• What Actually Happens When a Penny Hits You
• Comparing Terminal Velocities of Different Objects
• Why the Myth Persists Despite the Facts
• What Can Actually Hurt You When Dropped from Heights
• Frequently Asked Questions

For decades, the myth has persisted: drop a penny from the top of a tall building, and it becomes a deadly projectile capable of killing someone below. This urban legend has been repeated so many times that it feels like common knowledge. But here’s the surprising truth—it’s physically impossible for a penny to kill you, even if dropped from the Empire State Building. The fascinating physics behind this myth reveals why small, lightweight objects can’t turn into lethal weapons, no matter how far they fall.

The story is rooted in a misunderstanding of how objects fall through air. While it’s true that gravity accelerates falling objects, air resistance plays a crucial role that most people overlook. A penny simply doesn’t have the mass, shape, or aerodynamic properties to overcome the drag force of air and reach dangerous speeds.

Key Takeaways

• Pennies dropped from skyscrapers reach a terminal velocity of only 30-50 miles per hour due to air resistance, far too slow to be lethal.
• The flat, lightweight design of a penny creates significant drag, preventing it from accelerating beyond relatively safe speeds.
• A penny weighs approximately 2.5 grams—too light to generate sufficient impact force to penetrate skin or cause serious injury.
• MythBusters and other scientific experiments have repeatedly debunked this urban legend through practical testing.
• Terminal velocity varies dramatically by object shape and mass; a penny tumbles and flutters as it falls, slowing its descent.
• The myth likely originated from the general fear of falling objects and a misunderstanding of basic physics principles.

The Science Behind Pennies Dropped from Skyscrapers

When any object falls through the atmosphere, two forces act upon it: gravity pulling it downward and air resistance pushing back upward. Gravity accelerates the object at roughly 9.8 meters per second squared, but air resistance increases as speed increases. Eventually, these forces balance out, and the object stops accelerating—this maximum speed is called terminal velocity.

For a penny, terminal velocity is surprisingly low. The coin’s flat shape and light weight mean it encounters substantial air resistance relative to its mass. As it falls, a penny doesn’t slice cleanly through the air like an arrow. Instead, it tumbles, flutters, and spins chaotically. This tumbling motion creates even more drag, further limiting its speed. Scientists estimate that a penny reaches terminal velocity at around 30 to 50 miles per hour, depending on its orientation and how it tumbles during descent.

To put that in perspective, professional baseball pitchers regularly throw fastballs at 90-100 miles per hour. A penny falling at half that speed simply doesn’t carry enough kinetic energy to cause serious harm. The kinetic energy of a moving object depends on both its mass and velocity—and at just 2.5 grams, a penny has very little mass to work with.

What Actually Happens When a Penny Hits You

If you were unfortunate enough to be struck by a penny dropped from a skyscraper, you’d likely feel a brief sting, similar to being flicked by someone’s finger. The impact might be mildly annoying or startling, but it wouldn’t break skin or cause injury. The penny simply doesn’t have the momentum to penetrate or cause trauma.

The popular television show MythBusters tested this myth extensively. They dropped pennies from heights equivalent to skyscrapers and measured their impact. The results confirmed what physics predicts: the pennies caused no significant damage. When fired at much higher speeds using compressed air, pennies still failed to cause serious injury, merely stinging the skin upon impact.

Human skin is remarkably resilient to low-energy impacts. The outer layer, called the epidermis, can withstand considerable force from blunt objects, especially those with large surface areas like pennies. For a penny to penetrate skin, it would need to be traveling several times faster than terminal velocity allows—or it would need to be much heavier and more aerodynamic.

Comparing Terminal Velocities of Different Objects

Why the Myth Persists Despite the Facts

The penny-from-a-skyscraper myth endures because it feels intuitively correct. People understand that height equals danger—falling from great heights is deadly for humans, after all. The leap to assuming that objects dropped from great heights must also be deadly seems logical, even though the physics work differently for lightweight, non-aerodynamic objects.

The myth also benefits from its association with iconic buildings like the Empire State Building. These landmarks capture public imagination, and the idea of a penny becoming a weapon simply by virtue of being dropped from such a famous height adds dramatic appeal. Stories and urban legends often thrive on this combination of familiar landmarks and plausible-sounding danger.

Educational gaps in understanding physics concepts like terminal velocity and air resistance allow the myth to spread. Most people learn about gravity in school but may not deeply engage with how air resistance fundamentally changes the behavior of falling objects. Without that knowledge, the myth fills the gap with a simple, memorable narrative.

What Can Actually Hurt You When Dropped from Heights

While pennies pose no real threat, other objects dropped from skyscrapers certainly can cause injury or death. The key factors are mass, density, and aerodynamic shape. A wrench, hammer, or piece of construction equipment dropped from a high-rise construction site can easily reach lethal speeds because these objects are heavier and more streamlined than pennies.

Construction sites follow strict safety protocols precisely because falling tools represent genuine hazards. Hard hats, safety nets, and designated drop zones exist to protect workers and pedestrians from objects that actually can kill when dropped from height. These precautions would be unnecessary if all small objects behaved like pennies.

Even seemingly harmless objects can be dangerous if they’re heavy or aerodynamic enough. A smartphone dropped from a tall building could potentially cause injury due to its greater mass and more compact shape compared to a penny. The difference lies in the physics—more mass and better aerodynamics mean higher terminal velocity and greater impact force.

Frequently Asked Questions

What is the terminal velocity of a penny?

A penny reaches a terminal velocity of approximately 30 to 50 miles per hour when dropped from a great height, depending on how it tumbles and its orientation during the fall. This speed is far too slow to cause serious injury upon impact.

Has anyone ever been killed by a penny dropped from a building?

No verified cases exist of anyone being killed or seriously injured by a penny dropped from any height. The myth has been thoroughly debunked by scientific testing and physics calculations that demonstrate the impossibility of such an outcome.

Why doesn’t a penny keep accelerating as it falls?

Air resistance increases as the penny’s speed increases, eventually balancing out the force of gravity. Once these forces are equal, the penny stops accelerating and continues falling at a constant speed called terminal velocity.

What would happen if you dropped a penny in a vacuum from a skyscraper?

In a vacuum with no air resistance, a penny would continue accelerating until impact and could reach speeds over 200 miles per hour, potentially causing injury. However, this scenario is impossible in Earth’s atmosphere where air resistance always applies.

The next time someone repeats this old urban legend, you’ll know the real story. Physics doesn’t always align with intuition, and sometimes the most repeated “facts” turn out to be complete fiction. The humble penny, despite falling from dizzying heights, remains harmless—a testament to the protective power of something as simple as air.