Exit Velocity Calculator: How to Measure & Use It

This exit velocity calculator works out the speed of a batted ball right off the bat, using the distance it travels and the time it stays in the air. You enter distance and flight time, and you get back the average exit velocity in miles per hour or kilometers per hour, plus the launch angle if you add a height measurement. It is a straightforward physics tool that gives you a solid estimate of how hard a ball was hit.

Formula

The basic formula for average exit velocity is simple: divide the distance the ball travels by the total time it is in the air. This gives you the average speed in feet per second. To convert to miles per hour, multiply by 0.681818 (since 1 ft/s = 0.681818 mph). In symbols:

v (mph) = (d / t) × 0.681818

• v = average exit velocity in miles per hour (mph)
• d = distance the ball traveled in feet (ft)
• t = hang time in seconds (s)

This is a simplified model. Real exit velocity is measured at the moment of impact, not averaged over the whole flight. Air drag, spin, and launch angle all affect how far a ball goes for a given exit speed. This calculator gives you a rough average, not the instantaneous speed at the bat.

Worked Example

Using the default values: distance = 350 ft, hang time = 4.5 s.

1. Speed in ft/s = 350 / 4.5 = 77.78 ft/s
2. Convert to mph: 77.78 × 0.681818 = 53.0 mph
3. Convert to km/h: 77.78 × 1.09728 = 85.3 km/h

So the average exit velocity is about 53 mph. That is a low number for a professional baseball hit, because a real home run leaves the bat at 100+ mph but slows down due to air resistance. This calculator estimates the average speed over the whole flight, not the peak speed at contact.

Why Exit Velocity Matters

Exit velocity is a key metric in baseball and softball. It measures how hard a batter hits the ball, independent of where the ball lands. A high exit velocity often correlates with more home runs and extra-base hits, because harder-hit balls are harder to field and travel farther. Coaches and scouts use exit velocity to evaluate a player’s raw power. In recent years, Statcast has made exit velocity a common talking point, but you can estimate it yourself with just a radar gun or, as this calculator shows, with distance and time.

How to Measure Exit Velocity Accurately

To get a true exit velocity, you need a radar gun or a high-speed camera system. Radar guns used for pitching can also measure batted ball speed, but they must be positioned behind home plate or in the outfield. High-speed cameras track the ball for the first few feet after contact and calculate the speed. For a rough estimate, you can time the ball’s flight from bat to landing and use the distance. That gives an average, which will always be lower than the initial exit velocity because air resistance slows the ball.

Common Mistakes and Limitations

• Using average instead of peak: The calculator gives average speed over the flight, not the speed at the bat. Real exit velocity is measured immediately after contact.
• Ignoring air drag: A ball hit at 100 mph will slow down to maybe 80 mph by the time it lands. Distance and time alone cannot account for drag.
• Launch angle effect: A ball hit at a 45-degree angle stays in the air longer than one hit at 10 degrees, even with the same exit velocity. This changes the hang time and thus your calculated average.
• Wind and altitude: Wind can carry or hold a ball, and thin air at high altitude reduces drag. These factors are not in the formula.

How to Use the Result

Use the calculated average speed as a baseline, not a definitive measure. If you are comparing two swings, make sure the conditions (wind, altitude, ball type) are similar. For a more accurate exit velocity, use a radar gun. If you only have distance and time, this calculator gives you a rough idea. For example, a 400-foot home run with a 5-second hang time gives an average speed of about 54.5 mph, but the actual exit velocity might be 100+ mph.

Alternatives to This Calculator

If you need a more precise exit velocity, consider:

• Radar gun: Measures speed directly at the bat.
• High-speed video analysis: Tracks the ball’s position over time to compute initial speed.
• Statcast-style systems: Use multiple cameras and radar to track the ball’s entire trajectory.

Frequently Asked Questions

What is a good exit velocity?

In Major League Baseball, the average exit velocity is around 89 mph for all batted balls. A 95 mph exit velocity is considered strong, and 100+ mph is elite power. For amateur players, anything above 80 mph is above average.

Why is my calculated exit velocity so low?

Because you are getting the average speed over the whole flight, not the initial speed. Air drag slows the ball significantly. A ball that leaves the bat at 100 mph might average only 50-60 mph over its flight.

Can I use this for softball?

Yes, the physics is the same. Softballs are larger and have more drag, so the average speed will be even lower relative to the initial exit velocity. The formula still works for estimation.

Does launch angle matter?

Yes, it affects hang time and distance. A ball hit at 30 degrees with a given exit velocity will travel farther than one hit at 10 degrees, but it will also stay in the air longer, changing the average speed calculation.

How can I measure hang time accurately?

Use a stopwatch or a video camera with a timestamp. Start timing when the ball leaves the bat and stop when it hits the ground or is caught. For better accuracy, record at 60 fps and count frames.

Is exit velocity the same as bat speed?

No. Bat speed is how fast the bat is moving. Exit velocity is how fast the ball is moving after contact. They are related but not the same; a heavier bat or a better transfer of energy can increase exit velocity without increasing bat speed.

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in d | Distance | ft | 350 | 0
in t | Hang time | s | 4.5 | 0
out v | Exit velocity | mph | (d / t) * 0.681818 | 1
out v_kmh | Exit velocity | km/h | (d / t) * 1.09728 | 1