What Does SB Mean in Baseball? Stolen Base Explained
SB in baseball stands for stolen base — credited to a baserunner who advances a base on his own, without the help of a hit, walk, error, or other action that would have moved him anyway. It is a counting stat that pairs with CS (caught stealing) to measure base-stealing value.
What Does SB Mean in Baseball?
SB stands for stolen base. It is the credit a baserunner earns when he advances to the next base entirely on his own — breaking for the bag during a pitch and reaching it safely before the defense can tag him — without a hit, walk, balk, error, or other play that would have moved him there anyway. On a stat line SB is a pure counting number: a player with 40 SB stole forty bases on the season. It is the upside half of the running game, and it is read alongside its opposite, CS (caught stealing), to judge whether a runner's aggression actually helped his team.
How Is a Stolen Base Scored?
The official scorer awards a stolen base when a runner advances on his own and reaches the base safely under his own power, with no hit, walk, error, wild pitch, passed ball, balk, or defensive indifference accounting for the advance. The runner has to be the cause of his own progress: if he takes second only because the catcher's throw skips to the backstop, that is a wild pitch or passed ball, not a steal. There is no fielding credit attached to a successful steal — the defense simply failed to record an out. The most common steal is of second base; steals of third are rarer and steals of home are spectacular and rare.
Does a Stolen Base Help a Player's Stats?
A stolen base does not touch batting average or on-base percentage — those are settled at the plate, and the runner already reached base. What an SB does is add value on the bases: it moves a runner into scoring position, raises his run-scoring odds, and pads a counting category that fantasy and award voters track closely. The number that actually matters for evaluation is the stolen-base success rate, SB ÷ (SB + CS). Because a failed steal wipes out a baserunner and burns an out, a runner generally needs to succeed around 75% of the time for the attempts to be net-positive — a player with 30 SB and 4 CS is a real weapon, while 20 SB and 15 CS is closer to a wash.
Worked Example
Runner on first, nobody out. On the pitcher's first move home, the runner takes off, gets a strong jump, and slides into second a half-step ahead of the throw — SB, his fifteenth of the year. The official scorer credits the stolen base because he advanced on his own with no hit, walk, or wild pitch involved, and he is now in scoring position with a single able to drive him home. Change one detail — the catcher's throw beats him to the bag — and the same aggressive jump becomes a caught stealing instead, erasing the runner and the out. The margin between SB and CS is usually a great jump and a few hundredths of a second of speed.
Why Stolen Bases Matter
Stolen bases manufacture runs without a hit, and the modern game has made them more valuable than they had been in years. The 2023 rule changes — bigger bases, a pitch clock, and a two-pickoff limit per plate appearance — tilted the math sharply toward runners, and leaguewide steal attempts and success rates jumped as a result. The all-time stolen-base leader is Rickey Henderson with 1,406, a record that towers over the field; Lou Brock (938), Billy Hamilton (914), and Ty Cobb (897) round out the historic top of the list. For current-season steal leaders, the best on-site proxy is raw speed: the players at the top of the sprint-speed board are almost always the same names leading the league in stolen bases.
In Legends Deck
Legends Deck models a stolen base as a contest between the runner's speed and the battery's ability to stop him. A card's steal threat is driven by sprint speed — raw feet-per-second off the bag — while the defense's chance to convert a caught stealing comes down to a catcher's pop time, the seconds from glove pop to the throw reaching second. In-sim, an elite-speed card facing a slow-release backstop swipes bags at a high clip, while the same runner gets thrown out against a cannon arm. See where the league's fastest players rank on the 2026 MLB sprint speed leaderboard, or browse every Statcast input behind the cards on the leaderboards hub.