When a big league hitter squares up a fastball, the ball can leave the bat faster than cars travel on the highway. That speed has a name: exit velocity. It is one of the most important modern measurements in baseball, telling us how hard a ball was hit, how far it will travel, and how likely it is to fall for a hit. So how fast is a baseball actually hit, what is the record, and what makes the ball come off the bat so fast?
The answer involves a surprising amount of physics, from bat speed to the ball’s construction to the famous “trampoline effect.” Here is the full science of exit velocity, broken down clearly.
The chart below covers exit velocity numbers, the record, and the factors behind it. Take a look, then we’ll explain each part.
Contents
How Fast Is a Baseball Hit?
When we talk about how fast a baseball moves, there are two separate speeds: how fast it is pitched, and how fast it leaves the bat after being hit. That second number is called exit velocity. At the Major League level, the average exit velocity across all batted balls is roughly 89 to 90 miles per hour. That figure surprises some people who assume it is higher, but it includes every type of contact, weak grounders and bloops along with crushed line drives. The game’s elite hitters average closer to 92 mph per ball, and the very hardest individual hits reach well over 110 or even 120 mph. So a “typical” hit and a “best-case” hit are very different numbers.
What Is Exit Velocity, Exactly?
Exit velocity is the speed of the baseball the instant it comes off the bat after contact. It is considered one of the most objective measures of how well a ball was hit, because unlike batting average it does not depend on where fielders happen to be standing. Major League Baseball began tracking it in 2015 with the introduction of Statcast technology in all 30 ballparks, and it has since become a cornerstone of modern baseball analysis. The logic is simple: the harder you hit the ball, the less time fielders have to react and the farther it travels, both of which improve your odds of reaching base. That is why hitters and coaches at every level now obsess over it.
Why Exit Velocity Matters So Much
The numbers behind exit velocity are striking. Research has found that for every additional one mile per hour of exit velocity, a batted ball travels roughly four to six feet farther, which can be the exact difference between a warning-track flyout and a home run. The hit probability climbs sharply too: balls hit at 95 mph or more fall for hits roughly half the time, and once you get above 100 mph the batting average jumps to around .700. This is why scouts increasingly value a hitter’s exit velocity over their batting average alone, a player consistently hitting the ball hard is likely to produce results over time, even if luck has not caught up yet.
What Makes the Ball Come Off the Bat So Fast?
Several physical factors combine to produce exit velocity. The biggest single driver is bat speed, how fast the barrel is moving at the moment of contact. On top of that is the “trampoline effect,” where the ball and bat both compress on impact and then spring back, launching the ball outward. The quality of contact matters enormously too: squaring the ball up on the bat’s sweet spot transfers far more energy than a mishit. Equipment plays a role as well, aluminum and composite bats used in amateur ball flex more and produce more pop than the wood bats required in MLB. Even the ball’s construction (a cork-and-rubber core wrapped in wool yarn and a cowhide shell) is engineered to be both durable and lively.
The Record and the Stars Behind It
When it comes to the hardest-hit balls ever recorded, one name dominates: Giancarlo Stanton. He owns the top of the exit velocity leaderboard, including a single in May 2015 measured around 120 miles per hour, a number so high it almost defies belief for a batted ball. His blend of elite bat speed and tremendous raw strength puts him in a category of his own. It is worth noting that the very hardest “hits” are often hard grounders or line-drive singles rather than home runs, because launch angle, not just speed, determines whether a ball clears the fence. The combination of high exit velocity and an ideal launch angle is what produces those majestic, no-doubt home runs.
How Exit Velocity Is Measured
Exit velocity is captured using radar and high-speed camera systems, the same basic principle as the radar gun used to clock a speeding car. In MLB, Statcast (which has used TrackMan and Hawk-Eye technology) measures every batted ball in real time, while training tools like Rapsodo and HitTrax bring the same capability to colleges, high schools, and youth facilities. For context on the other half of the speed equation, professional fastballs typically run 90 to 95-plus mph, with off-speed pitches like changeups and sliders sitting around 70 to 85 mph. Interestingly, a faster incoming pitch can contribute to a higher exit velocity, since more energy is available to rebound off the bat. If you enjoy baseball stats, check out our explainer on what WHIP is in baseball.
The Bottom Line
Exit velocity tells you how fast a baseball is hit, and it has become one of the game’s most valuable measurements. The average MLB batted ball comes off the bat around 89 to 90 mph, elite hitters average closer to 92, and the hardest hits, led by Giancarlo Stanton’s roughly 120 mph rockets, push past the limits of what seems possible. Bat speed, the trampoline effect, quality of contact, and equipment all combine to determine how hard a ball is struck, and every extra mile per hour means a few more feet of distance and a better chance at a hit. The next time you hear a broadcaster mention a 110 mph laser, you will know exactly how impressive that really is.