What is Line Drive Rate? Definition, Formula, and Example
Line drive rate (LD%) is the percentage of a hitter's batted balls that are classified as line drives, the contact type that produces the highest batting average on balls in play.
What is Line Drive Rate?
Line drive rate, written as LD%, is the share of a batter's batted balls that are scored as line drives rather than ground balls, fly balls, or popups. A line drive is a hard, flat-trajectory ball hit on a rope — think a screamer into the gap or a single that one-hops the wall. It is the most valuable contact type in baseball because line drives find grass far more often than any other batted ball. League-average LD% sits around 21%, and the difference between a 19% line-drive hitter and a 25% line-drive hitter is the difference between a punchless slap hitter and a doubles machine.
How Line Drive Rate Is Calculated
The formula is straightforward:
LD% = Line Drives / Total Batted Balls
The denominator is balls in play plus home runs — every ball the hitter actually struck fair, excluding strikeouts and walks. Classification has historically been done by human stringers (the BIS/FanGraphs system), which introduces some subjectivity, and more recently by Statcast using launch angle. In the launch-angle framework, line drives generally occupy the 10-to-25-degree window off the bat, sandwiched between ground balls (under 10 degrees) and fly balls (above 25 degrees). Because the cutoffs differ slightly between providers, a hitter's LD% can vary a point or two depending on the source.
Worked Example
Freddie Freeman is the textbook line-drive hitter. Across his peak seasons he has posted LD% marks in the 24–27% range, well above the 21% league baseline. In a representative season he might put 450 balls in play and have roughly 115 of them scored as line drives — a 25.5% rate. That elite line-drive profile is the engine behind his consistently high BABIP (often .340-plus) and his ability to hit .300 year after year. Compare that to an extreme fly-ball slugger like Joey Gallo, whose LD% has dipped into the mid-teens; his power survives, but his batting average craters because fewer balls leave the bat on a line.
The payoff is in the BABIP gap by batted-ball type. League-wide, line drives fall for hits roughly 65–68% of the time, ground balls around 24%, and non-home-run fly balls around 12–13%. No other contact type comes close to a line drive's hit probability.
Why Line Drive Rate Matters
For front offices and scouts, a rising LD% signals a hitter squaring the ball up consistently — a leading indicator that batting average and doubles are real, not luck. For fantasy and DFS players, LD% helps separate sustainable batting-average performers from hitters living on an unrepeatable BABIP spike. A .320 hitter with a 17% line-drive rate is a regression candidate; a .320 hitter with a 26% rate has earned it. LD% also pairs with hard-hit data: a hitter who is both hitting line drives *and* hitting them hard is the safest bet for sustained production.
Limitations and Common Misconceptions
The biggest weakness of LD% is its instability. Line-drive rate is the slowest batted-ball metric to stabilize — it can swing several points season to season on classification noise alone, so single-season readings deserve skepticism. It also says nothing about how hard the ball was hit; a soft line drive into the shift is still a line drive on the scoresheet. Treat LD% as one input alongside exit velocity, not a standalone verdict on contact quality.
Related Terms
In Legends Deck: Line drive rate feeds the contact-quality component of a hitter's card. Players with elite LD% get a higher base-hit floor in the simulation engine — their batted-ball results skew toward singles and doubles even on average exit velocity, modeling the real-world truth that a ball on a line beats the defense more often than a ball in the air.