Exit Velocity Guide
Bat speed vs exit velocity
Published July 8, 2026 • 6 minute read
They get used interchangeably, but they measure two different moments. Bat speed is what the hitter controls. Exit velocity
is the outcome. Understanding how one turns into the other tells you what to actually work on.
The core difference
Bat speed is how fast the barrel is traveling through the hitting zone, measured just before contact.
It is a pure input: it depends on the swing, not on the pitch.
Exit velocity is how fast the ball comes off the bat after contact. It is an outcome that depends on three
things: bat speed, how squarely the barrel meets the ball, and the speed of the incoming pitch.
That third factor surprises people. Some of the pitch's speed rebounds off the bat, so the same swing produces a higher
exit velocity off live pitching than off a stationary tee.
The formula that links them
A simplified collision model that coaches use looks like this:
exit velocity ≈ (1.2 × bat speed) + (0.2 × pitch speed)
You can run any combination through the
Bat Speed to Exit Velocity Calculator —
set the contact quality and both speeds and it returns the estimated exit velocity, smash factor, and carry.
The 1.2 comes from the "collision efficiency" or smash factor of a well-struck ball — roughly how much of the bat's speed
transfers plus a bit of trampoline rebound. The 0.2 is the share of the incoming pitch speed that bounces back. Square up a
70 mph pitch with 70 mph of bat speed and you land near 98 mph of exit velocity.
| Bat speed | Pitch speed | Est. exit velocity |
|---|
| 55 mph | 50 mph | ~76 mph |
| 60 mph | 55 mph | ~83 mph |
| 65 mph | 60 mph | ~90 mph |
| 70 mph | 65 mph | ~97 mph |
| 75 mph | 70 mph | ~104 mph |
These assume flush contact. Off-center hits lose energy fast, which is why bat speed alone never guarantees the exit
velocity number.
Which one should you train?
You cannot train exit velocity directly — it is the scoreboard. What you train are its two inputs:
- Bat speed — weighted bats, speed sticks, and overload/underload work build the raw barrel speed. This is the single biggest lever for most hitters.
- Barrel accuracy — tee and machine reps improve how flush you catch the ball. A slightly slower bat that squares up beats a faster bat that mishits.
Measure exit velocity to check whether the training is working, but point the actual work at bat speed and contact quality.
A pocket radar makes the feedback loop fast: swing, read the number, adjust.
Optional training gear lane
A pocket radar, a swing trainer, or a pitching machine are the three most common tools for exit velocity development work.
Browse exit velocity training gear
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Bat speed vs exit velocity FAQ
What is the difference between bat speed and exit velocity?
Bat speed is how fast the barrel moves through the zone before contact. Exit velocity is how fast the ball leaves the bat after contact, and it depends on bat speed, contact quality, and the incoming pitch speed.
How much faster is exit velocity than bat speed?
On solid contact off a pitched ball, exit velocity is usually about 1.2 to 1.5 times bat speed. Off a tee the multiplier is lower because there is no incoming pitch speed to add.
Should I train bat speed or exit velocity?
Train bat speed and barrel accuracy — exit velocity is the result of both. Weighted bats and speed sticks build bat speed, and machine and tee work improve how squarely you make contact.