What is Bat Speed? Definition, Formula, and Example

What is bat speed?

Bat speed is the velocity of the bat's barrel at the point of contact, measured in miles per hour by Statcast's Hawkeye tracking system. MLB began publicly publishing bat speed data in May 2024, making it one of the newest batted-ball metrics. It is measured at the "sweet spot" of the bat—six inches from the tip—and represents the instantaneous speed of the swing itself, not the ball leaving the bat.

How bat speed is measured

Hawkeye's high-speed cameras track every swing in every MLB ballpark. The system identifies the bat in space, computes its trajectory through the strike zone, and records a family of related metrics:

• Bat speed (mph): velocity of the sweet spot at contact (or nearest point on a whiff)
• Swing length (feet): total distance the barrel travels from swing start to contact
• Fast-swing rate: share of swings at or above 75 mph bat speed
• Squared-up rate: share of contact where the bat meets the ball with minimal energy loss (80%+ transfer)
• Blast rate: share of swings that are both fast (≥ 75 mph) and squared-up (≥ 80%)

League average bat speed in 2024 sat around 71 mph. A 75 mph swing is considered "fast," and any hitter averaging above 76 mph is in the top tier of the league.

Worked example

In 2024, Giancarlo Stanton led MLB in average bat speed at 81.2 mph—the only qualified hitter above 81. His fast-swing rate was 97%, meaning nearly every swing he took crossed the fast-swing threshold. Oneil Cruz (77.7 mph), Aaron Judge (75.9 mph), and Kyle Schwarber (76.2 mph) rounded out the power elite.

At the other extreme, contact-oriented hitters sit well below average. Luis Arraez averaged roughly 65 mph, and Steven Kwan landed near 66 mph—both hitters who rely on swing decisions and barrel accuracy rather than raw force. The spread from bottom to top is more than 15 mph, a larger range than most Statcast metrics.

Why bat speed matters

Bat speed is the single largest input to exit velocity. A one-mph increase in bat speed translates, on average, to roughly 1.2 mph of additional exit velocity on squared-up contact. That compounds into longer fly balls, more barrels, and more home runs.

Front offices use bat speed to evaluate three things:

• Aging decline. Bat speed drops before batting average does. Albert Pujols, Miguel Cabrera, and Joey Votto each lost 3+ mph in their final productive seasons.
• Prospect projection. Minor-league bat-speed data predicts MLB power output more reliably than raw home-run totals.
• Swing changes. A hitter who adds bat speed after a mechanical adjustment is a buy signal for fantasy managers.

Limitations and common misconceptions

• Fast bat speed does not guarantee production. Stanton leads the league but strikes out at a 30%+ rate. Contact quality, measured by squared-up rate, matters just as much.
• Shorter swings can outperform faster ones. Arraez hits .300+ with among the slowest bat speeds in MLB because his swing decisions and bat path offset the velocity gap.
• Bat speed is not "swing speed" in the traditional sense. It's measured at the sweet spot, not at the hands, so a short, compact swing can still register a high reading.

Related terms

• What is exit velocity?
• What is barrel rate?
• What is launch angle?
• What is squared-up rate?
• What is Statcast?

In Legends Deck

Bat speed shapes a hitter's power rating in Legends Deck. Cards for hitters like Stanton and Judge carry elevated bat-speed modifiers that push simulated exit velocities into the barrel zone more often, while contact-first cards like Arraez trade bat speed for a squared-up bonus that improves singles and line drives. When you draft a 2024 card, the engine uses that season's actual bat-speed distribution to drive the contact physics on every simulated at-bat.