A person falling through the atmosphere in the standard belly-to-earth skydiving position reaches a terminal velocity of roughly 120 miles per hour (about 195 km/h). That figure, though, is closer to a starting point than a fixed answer. Change the body’s orientation, climb to a higher altitude, or strap on a tight suit, and that number can shift by hundreds of miles per hour in either direction. The real answer depends on what the falling person is doing with their body and where in the atmosphere they happen to be.
What Terminal Velocity Actually Means for a Falling Body
When you step out of an airplane, you accelerate under gravity. But as your speed increases, so does the air pushing against you. At some point, the drag force pushing up exactly equals the gravitational force pulling down, and you stop accelerating. That speed is your terminal velocity. You are still falling, but you are no longer speeding up. For most skydivers in the belly-down spread-eagle position, this equilibrium kicks in after roughly 10 to 15 seconds of freefall, at somewhere around 1,000 feet of altitude lost.
The key variables in the equation are straightforward: how heavy you are (more weight means gravity pulls harder), how much surface area you present to the oncoming air (more area means more drag), how streamlined your shape is (a flat pancake catches more air than a dart), and how dense the air is around you. All four of these can be manipulated, which is why terminal velocity is not one number but a range.
How Body Position Changes Everything
The single biggest factor a skydiver controls is body orientation. In the classic belly-to-earth spread-eagle, a person presents roughly their maximum cross-sectional area to the airflow. This is the position that produces the familiar 120 mph figure. Curling into a ball or pulling the arms in tight reduces drag somewhat and can push speed up to around 130 to 140 mph.
Going head-down changes the picture dramatically. In a vertical head-first position, the body becomes far more streamlined: the cross-section facing the wind shrinks to roughly the area of the head and shoulders instead of the entire torso. Speed skydivers adopt exactly this posture, aiming to reach the highest possible free-fall speed by reducing their windward cross-section and presenting a more streamlined form to the air.1European Journal of Mechanics – B/Fluids. Numerical analysis of the flow around a speed skydiver In this orientation, experienced skydivers can exceed 150 mph easily, and competitive speed skydivers in tight suits regularly surpass 300 mph.
On the slower end, arching the back hard, flaring the arms and legs wide, and wearing a loose jumpsuit can push terminal velocity down to around 100 to 110 mph. Wingsuit fliers take this to an extreme by adding fabric between the arms and legs, which massively increases surface area and can bring vertical terminal velocity down to around 40 to 60 mph while also generating forward glide.
Does Body Weight Matter Much?
Heavier people do fall faster, all else being equal. A 220-pound person in the same posture and outfit as a 130-pound person will have a somewhat higher terminal velocity, because they carry more gravitational force pulling them down while their frontal area does not grow in proportion. But the relationship is not as strong as you might expect. Research into the terminal velocity of skydivers in the horizontal spread-eagle position has shown that the speed is somewhat insensitive to the mass of the diver.2Physics Education. Terminal velocity of skydivers
The reason is that terminal velocity scales with the square root of mass, not with mass directly. Doubling someone’s weight does not double their terminal velocity; it increases it by about 40 percent. And in practice, a person who weighs twice as much as another person also tends to be larger overall, presenting a bigger frontal area that partially offsets the extra weight. This is why tandem skydivers, where two people are strapped together, do not plummet dramatically faster than solo jumpers. They are heavier, yes, but they also present a larger profile to the wind. The net increase in speed exists but is modest enough that tandem pairs can still share the sky with solo divers during formation jumps.
Classroom physics experiments using parachutist models have confirmed that terminal velocity is directly proportional to the square root of mass, with heavier objects reaching their terminal speed sooner during the fall but not at a dramatically different final speed.3IOP Publishing. Tracking the terminal velocity and energy of a parachutist: A video analysis for Physics classroom experiment
How Air Density Shifts the Numbers
The 120 mph baseline assumes you are falling at typical skydiving altitudes, roughly 10,000 to 15,000 feet above sea level, where the air is already noticeably thinner than at ground level. Air density drops as you climb higher, which means less drag for the same body position and speed. Fall from the same altitude on a hot summer day in Denver (already 5,000 feet elevation, with warm thin air) and you will hit a slightly higher terminal velocity than jumping on a cold winter day at sea level, where the air is thick and heavy.
This effect is mild at normal skydiving altitudes but becomes enormous at extreme heights. The same body shape that tops out at 120 mph at 13,000 feet could reach 200 mph or more at 60,000 feet, simply because the air up there has a fraction of the density found lower down. The terminal velocity of skydivers depends on the density of the medium they are falling through, a point that has been demonstrated numerically in research on skydiver aerodynamics.2Physics Education. Terminal velocity of skydivers
Stratospheric Freefall and Breaking the Sound Barrier
The most extreme demonstration of how altitude reshapes terminal velocity came from the high-altitude jumps of the mid-twentieth and early twenty-first centuries. In 1960, U.S. Air Force Captain Joseph Kittinger jumped from a balloon gondola at roughly 102,800 feet. More than fifty years later, in 2012, Felix Baumgartner jumped from approximately 128,100 feet as part of the Red Bull Stratos project, and in 2014, Alan Eustace topped that with a jump from around 135,890 feet.
At the altitudes where these jumps began, the atmosphere is so thin that it provides almost no resistance. Baumgartner reportedly exceeded 843 mph during freefall, breaking the speed of sound and becoming the first person to do so without a vehicle. Eustace reached similar supersonic speeds. In both cases, the jumper slowed dramatically as they descended into thicker air, eventually reaching a familiar terminal velocity well below 200 mph in the lower atmosphere before deploying a parachute.
These jumps highlight a fact that surprises many people: terminal velocity is not a fixed property of your body. It is a continuously shifting equilibrium between your weight and the air’s ability to resist you. As Baumgartner fell, his terminal velocity changed second by second, dropping from supersonic at extreme altitude to ordinary skydiving speeds as the atmosphere thickened beneath him. He was always at or near terminal velocity for the local conditions; it was the conditions that kept changing.
Speed Skydiving as a Competitive Sport
At conventional altitudes, the practical ceiling on human terminal velocity is explored by speed skydivers. This is a competitive discipline recognized by the Fédération Aéronautique Internationale (FAI), in which jumpers exit aircraft at typical skydiving altitudes and attempt to achieve the highest speed during a measured window, usually between 8,200 and 5,600 feet above ground level. Because the altitude is fixed and the air density is roughly constant, the competition becomes a test of body position and equipment.
Speed skydivers jump in a head-down posture, arms pinned tight to the body, legs together, wearing smooth close-fitting suits designed to minimize drag. Computational fluid dynamics research on speed skydivers has examined how this head-down orientation reduces the windward cross-section compared to a belly-down posture, producing substantially higher free-fall speeds.1European Journal of Mechanics – B/Fluids. Numerical analysis of the flow around a speed skydiver Current world records in the sport sit above 370 mph for men and above 310 mph for women, figures that are roughly three times the standard belly-to-earth number. These speeds are achieved at normal skydiving altitudes, not in the stratosphere, which makes them a cleaner measure of what body position and streamlining can accomplish against a fixed atmosphere.
The aerodynamics at these speeds introduce complications that recreational skydivers rarely encounter. At 300-plus mph, small asymmetries in body position create large turning forces. Keeping the body perfectly aligned and stable requires serious physical conditioning and thousands of practice jumps. The air flowing around a speed skydiver at those velocities behaves differently than at 120 mph, with turbulent wake patterns and pressure distributions that have been studied through numerical simulations to better understand the forces involved.
Measuring Human Drag in the Lab
Most terminal velocity estimates for humans rely on calculating how much drag a body produces at a given speed. While you cannot safely put a person in true freefall inside a laboratory, you can put them in a wind tunnel and measure the force the wind exerts on them. One notable study did exactly this with 331 people standing in a wind tunnel, measuring the wind drag and analyzing the results in terms of projected areas and drag coefficients.4Building and Environment. Measurements of wind drag on people standing in a wind tunnel
Studies like this establish the drag coefficients used to estimate terminal velocity across different body shapes and postures. A drag coefficient is just a number that captures how “slippery” or “catchy” a particular shape is in the air. For a person in the spread-eagle position, the effective drag coefficient combined with their frontal area produces enough resistance to balance gravity at around 120 mph. For a person standing upright, the coefficient and area are different. For someone head-down in a tight suit, different again. These wind-tunnel-derived numbers form the empirical backbone of the terminal velocity estimates that get tossed around in textbooks and skydiving forums.
The practical challenge is that human bodies are irregular, flexible, and clothed, none of which makes for clean aerodynamic modeling. A loose jacket flapping in the wind creates different drag than a skin-tight jumpsuit. Arms positioned slightly differently change the frontal area by a surprising amount. This variability is part of why “the terminal velocity of a human” is always an approximation with a range rather than a single precise figure.
What Terminal Velocity Feels Like
A common misconception is that reaching terminal velocity feels like a sudden jolt or a noticeable moment of transition. In reality, the deceleration is gradual. You do not feel yourself falling in the traditional roller-coaster stomach-drop sense after the first few seconds, because there is no relative motion between your body and its immediate surroundings to generate that sensation. What you feel instead is wind: an enormous, sustained blast of air pressing against every exposed surface of your body.
At 120 mph, the wind pressure is enough to distort your cheeks, force your eyelids shut if unprotected, and make breathing through an open mouth difficult. Communication by shouting is impossible. Your sense of altitude disappears because the ground below, unless very close, does not appear to be moving very fast from thousands of feet up. Most first-time skydivers describe the freefall portion as shockingly loud and windy rather than scary in the falling sense. The fear comes before and after, not during.
At higher speeds in the head-down position, the wind forces concentrate on a smaller area but hit harder. Speed skydivers report significantly more pressure on the top of the head and shoulders, and the buffeting forces on any body part that drifts out of alignment can be violent enough to throw the diver into an uncontrolled spin.
The Forces of Coming to a Stop
Terminal velocity only tells half the story. The other half is what happens when you decelerate. For skydivers, that deceleration comes from a parachute, and the transition from terminal velocity to a gentle descent is called the parachute opening shock. The forces involved are significant: research on experienced skydivers performing terminal velocity jumps found that neck muscle activity during parachute opening reached 53 to 104 percent of the maximum voluntary effort those muscles could produce.5PubMed. Neck muscle activity in skydivers during parachute opening shock Activity often exceeded normal reference levels in the lower neck and upper shoulders, and the skydivers appeared to use anticipatory bracing as a strategy to protect their spines.
Modern sport parachutes are designed to open gradually rather than all at once, spreading the deceleration over several seconds. Older round parachutes and military static-line systems produce sharper opening shocks. The faster you are going when the canopy inflates, the greater the forces involved, which is one reason speed skydivers deploy a small stabilizer drogue chute before opening their main canopy. The drogue slows them from their peak speed to a more manageable velocity before the main parachute takes over.
For jumps from extreme altitude, where the diver may be falling at supersonic or near-supersonic speeds, the drogue chute also serves a second purpose. At very high speeds, a falling body with any asymmetry tends to enter a flat spin that can produce dangerous centrifugal forces on the blood and internal organs. The U.S. Air Force developed the multistage parachute concept in the late 1950s specifically to address this problem during high-altitude emergency escapes. A small drogue stabilizes the body during the high-speed portion of the descent, and the main canopy deploys lower down once the diver has slowed into thicker air.
Surviving a Fall at Terminal Velocity
People occasionally survive impacts at or near terminal velocity, though the circumstances are extraordinary. The most famous cases involve falls during World War II when aircrew fell from bombed aircraft without functioning parachutes and survived by landing on surfaces that extended their deceleration. Deep snow, dense vegetation, steep slopes, and even glass skylights have been credited with saving lives by converting a near-instantaneous stop into one lasting a fraction of a second longer, enough to keep the peak force below the threshold for fatal injury.
Vesna Vulović, a Serbian flight attendant, is often cited as having survived the highest fall without a parachute after the aircraft she was in broke apart at over 33,000 feet in 1972. She suffered severe injuries but lived, likely because she remained inside a section of the fuselage that acted as a partial cushion during impact. Whether her case represents true freefall at terminal velocity is debatable, but it underscores a point about survivability: it is not the speed of the fall that kills, but the rate of deceleration at the end. A person moving at 120 mph who decelerates over two meters of crumpling snow experiences vastly lower peak forces than one who hits concrete and stops in a centimeter.
This is also why vertical indoor skydiving tunnels are safe. The person inside is floating on a column of air moving upward at roughly terminal velocity. They are experiencing the same aerodynamic forces as a real skydiver, but there is no ground rushing up to meet them. The danger of terminal velocity was never the speed itself; it was always the sudden stop at the end.
Why Indoor Skydiving Tunnels Use Different Speeds
Vertical wind tunnels used for indoor skydiving typically generate airflow in the range of 80 to 140 mph, adjustable based on the flier’s weight and skill level. A lighter person or a child needs less wind speed to float; a heavier or more experienced flier wanting to practice head-down flying needs more. The tunnel operators adjust the fan speed so that the upward airflow exactly matches the person’s terminal velocity in whatever posture they are practicing.
This is a controlled demonstration of the same physics at work in a real skydive. If a 180-pound person in a belly-down position needs 120 mph of airflow to float, and a 120-pound person needs about 100 mph, the difference reflects the square-root-of-mass relationship. Tunnel flying has become a serious training tool for competitive skydivers, including speed skydivers, because it allows them to practice body positions and feel the aerodynamic consequences without the cost and risk of repeated jumps from aircraft. The ability to fine-tune wind speed also makes tunnels useful for research, since you can measure how much airflow a given person in a given posture needs to stay neutrally buoyant, which is another way of measuring their terminal velocity directly.