What is a Barrel? Definition, Formula, and Example

What is a Barrel in Baseball?

A barrel is a batted-ball category defined by Major League Baseball to identify the most optimally struck baseballs. Introduced by Statcast in 2016, the term classifies a specific subset of batted balls that possess the exact combination of exit velocity and launch angle required to produce extra-base hits and home runs at a highly predictable rate. For a batted ball to be classified as a barrel, it must meet a minimum .500 batting average and 1.500 slugging percentage threshold based on historical comparisons of identical contact. If a hitter barrels the baseball, he has hit it as hard and at the ideal angle as the best players in the world.

How it is Calculated and Measured

The calculation of a barrel relies on two primary Statcast measurements: Exit Velocity (the speed of the baseball off the bat) and Launch Angle (the vertical direction of the ball immediately after contact).

The baseline criteria for a barrel requires an exit velocity of at least 98 mph. As exit velocity increases, the allowable launch angle window expands:

• At 98 mph exit velocity, the launch angle must fall strictly between 26 and 30 degrees.
• At 99 mph, the launch angle window expands to 25 to 31 degrees.
• At 100 mph, the acceptable launch angle window widens further to 11 to 39 degrees.
• At 115 mph or higher, the launch angle window stretches from roughly 8 to 42 degrees.

The aggregate metric used for player evaluation is Barrel Rate (BRL%), which divides a player's total barrels by their total batted balls (Batted Balls = Balls in Play + Home Runs). The formula is: Barrel Rate = (Total Barrels / Total Batted Balls) * 100.

Worked Example

During the 2023 MLB season, Los Angeles Dodgers superstar Shohei Ohtani recorded 82 barrels across 347 total batted balls. By dividing 82 by 347 and multiplying by 100, Ohtani posted a Barrel Rate of 23.6%. The MLB average Barrel Rate for the 2023 season sat at roughly 7.0%. Aaron Judge also posted massive barrel numbers, routinely exceeding 20% in his peak seasons, while contact-oriented hitters like Jeff McNeil posted Barrel Rates below 4%. A barrelled ball travels with an average batting average of over .800 and a slugging percentage north of 2.500, making it the most predictive batted-ball outcome metric in the sport.

Why it Matters

Barrel Rate is the gold standard for predicting future offensive performance because it strips out the luck and timing factors associated with standard batting average. Front office executives use Barrel Rate to identify underperforming hitters poised for a breakout—if a player posts a high Barrel Rate but a low batting average on balls in play (BABIP), they are likely hitting into bad luck and due for positive regression. Fantasy baseball players track barrels to find buy-low trade targets. In card collecting, rookies with elite Barrel Rates command immediate market premiums because the metric validates their raw power.

Limitations and Common Misconceptions

A common misconception is that a barrel automatically guarantees a home run. While barreled balls result in extra-base hits the vast majority of the time, a barrel hit at 26 degrees in an extreme pitcher's park with a 15 mph headwind can result in a warning-track flyout. Additionally, Barrel Rate does not account for a hitter's ability to make contact in the first place. Joey Gallo routinely posted elite Barrel Rates, but paired with massive strikeout totals, the sheer volume of barreled baseballs never translated to elite season-long batting averages.

Related Terms

• Barrel Rate
• Exit Velocity
• Launch Angle
• Hard Hit Rate

In Legends Deck: A batter's Barrel Rate directly dictates the Power attributes on their Legends Deck card. High Barrel Rate hitters receive massive boosts to their Extra-Base Hit probability modifiers and Home Run roll ranges, allowing them to punish opposing pitchers who leave the ball in the middle of the strike zone.