What is Squared-Up Rate? Definition, Formula, and Example
Squared-up rate is the percentage of swings on which a hitter transfers at least 80% of the maximum possible exit velocity to the ball, given their bat speed and the incoming pitch speed.
Plain-English Definition
Squared-up rate measures how often a hitter catches the ball cleanly on the barrel — not in terms of launch angle or exit velocity in a vacuum, but relative to what was physically possible on that swing. A "squared-up" contact event is one where the actual exit velocity reaches at least 80% of the theoretical maximum exit velocity available given the batter's bat speed and the pitch's incoming velocity. It is a pure measure of impact quality, stripped of how fast the bat was moving or how hard the pitch arrived.
How It's Calculated
Statcast introduced squared-up rate as part of its 2024 bat-tracking rollout. The calculation has two steps:
1. Compute the collision ceiling. Maximum possible exit velocity ≈ (1.23 × bat speed) + (0.23 × pitch speed), in mph. This is the perfect-collision benchmark physics allows for the swing.
2. Compare actual to maximum. Squared-up % = actual exit velocity ÷ max possible EV. If the ratio is ≥ 0.80, the swing is flagged as squared up.
Statcast publishes the metric in two flavors:
- Squared-up per swing (Sq/Swing) — squared-up batted balls divided by total competitive swings (including whiffs and fouls).
- Squared-up per batted ball event (Sq/BBE) — squared-up batted balls divided by balls in play.
Sq/BBE rewards bat-to-ball skill once contact is made. Sq/Swing folds in swing decisions and contact rate together.
Worked Example
In 2024, Luis Arraez led MLB in squared-up per swing at roughly 35%, meaning more than one in three of his cuts produced a near-optimal collision. Steven Kwan and Jacob Wilson sat just behind him. On the heavy-bat end, Aaron Judge posted a more modest ~22% Sq/Swing but converted those at elite power — his squared-up batted balls averaged exit velocities above 100 mph because his maximum was already so high. Compare that to Javier Báez at ~14% Sq/Swing, whose long, all-or-nothing swing produces far more glancing contact and frequent whiffs.
Why It Matters
Squared-up rate isolates bat-to-ball skill from raw power. A hitter with a 75-mph bat speed and a 35% squared-up rate is a contact savant; a hitter with 80-mph bat speed but a 15% squared-up rate is leaving exit velocity on the table through mishits. Front offices use it to project hit tools — particularly for prospects whose raw exit velocities look soft. Fantasy managers use it as a leading indicator for batting average on balls in play sustainability and breakout candidates. Pitching staffs use the inverse — opposing squared-up rate allowed — to grade swing-and-miss versus weak-contact stuff.
Limitations and Common Misconceptions
Squared-up rate is *not* the same as barrel rate. A barrel requires both high exit velocity *and* a productive launch angle (roughly 26–30°). A squared-up ball can be a low scorching line drive, a soft pop-up, or a roller — any clean collision counts, regardless of trajectory. Arraez squares up balls into the ground constantly; Judge squares up at lower frequency but with damage angles. The two metrics should be read together: squared-up rate tells you about contact purity, barrel rate tells you about productive contact. The metric also requires Statcast bat-tracking coverage, so it is only available for 2024 onward.
Related Terms
In Legends Deck
Squared-up rate feeds directly into a hitter card's Contact rating in Legends Deck. Cards like Arraez and Kwan grade high on Contact and lower on Power, producing simulation outcomes that skew toward singles and line drives. Power hitters with high squared-up rates *and* productive attack angles — Judge, Yordan Alvarez, Shohei Ohtani — get a stacked Contact + Power profile that drives elite simulated wOBA. Squared-up rate is the underlying signal that prevents the engine from confusing "fast bat" with "good hitter."