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.
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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.