What is Run Value? Definition, Formula, and Example
Run Value is a Statcast metric that measures how many runs a single pitch, plate appearance, or season's worth of events added or subtracted relative to league average, calculated from the run expectancy matrix.
Run Value Definition
Run Value (RV) measures how many runs a baseball event was worth, expressed as the change in expected runs from before the event to after. Statcast publishes Run Value at the pitch level, the plate-appearance level, and aggregated to a season for hitters, pitchers, and individual pitch types. For pitchers, negative RV is good (they prevented runs); for hitters, positive RV is good (they created them). It is the single most direct way to translate granular event data into the only currency that decides games — runs.
How Run Value Is Calculated
Run Value rests on the run expectancy matrix, a 24-cell table built from decades of play-by-play data. Each cell is keyed by base-out state (eight base configurations × three out totals) and stores the average number of runs scored by the offense from that state to the end of the inning. A simplified slice:
- Bases empty, 0 outs: ~0.50 expected runs
- Runner on first, 0 outs: ~0.86
- Bases loaded, 0 outs: ~2.27
- Runner on first, 2 outs: ~0.22
The Run Value of any event is:
RV = (Run Expectancy after) − (Run Expectancy before) + (Runs scored on the play)
Modern Statcast extends this to the count level, so a 3-0 ball is worth a different RV than a 0-2 ball — falling behind 3-0 jumps the hitter's expected wOBA by a much larger amount than going from 1-1 to 2-1. Each pitch's RV is the change in expected run value of the plate appearance.
Worked Example
A solo home run in a 0-0 count, bases empty, no outs is worth roughly +1.4 runs of RV — the hitter banked one actual run plus a small boost in expectancy for the next batter. A bases-loaded walk in a tie game is worth about +1.0 RV. A called strike three on a 3-2 pitch with the bases loaded and two outs is worth roughly −0.9 RV for the hitter, +0.9 for the pitcher, because it converts a high-leverage state to zero.
In 2024, Tarik Skubal posted approximately −29 RV across his arsenal, leading qualified starters and earning the AL Cy Young. His four-seamer alone was worth roughly −18 runs versus league-average four-seamers thrown in the same counts and locations. Aaron Judge produced about +74 RV at the plate that same season, the highest figure in baseball.
Why Run Value Matters
RV is the bridge between pitch-level analytics and team-level outcomes. Front offices use Run Value per 100 pitches (RV/100) to evaluate individual pitches in an arsenal — if a slider grades at −2.5 RV/100 but a curveball grades at +1.0 RV/100, the pitcher should throw more sliders. Pitching coaches use it to decide which secondary to develop. Hitting coaches use it to flag which counts a hitter is leaking value in. Fantasy and DFS players use seasonal RV as a stickier predictor than ERA or wins.
Limitations and Misconceptions
Run Value is descriptive of what happened, not always predictive of skill. A pitcher who got BABIP-lucky will show better RV than his underlying stuff deserves; a hitter who ran into a hot streak in high-leverage counts will look elite even if his contact quality regresses. Statcast also publishes an expected Run Value (xRV) that strips out batted-ball luck — that's the version to lean on for projection. Finally, RV is count- and context-dependent, so comparing pitchers across very different leverage profiles requires care.
Related Terms
In Legends Deck
Every pitch in a Legends Deck simulation resolves through a run-value engine that mirrors MLB's run expectancy matrix. Card ratings for individual pitch types are derived from real RV/100 numbers, so a card with a "plus-plus slider" generates the same expected run suppression in-game that the pitch produced on Statcast. This is what makes wOBA, xwOBA, and pitch-mix decisions in the sim track real outcomes instead of arbitrary attack rolls.