What Does SB Mean in Baseball? Stolen Base Explained

By Sarah Miller · March 29, 2053

In baseball, SB stands for Stolen Base, a statistic credited to a baserunner who successfully advances to the next base while the pitcher is delivering the ball to home plate, without the benefit of a hit, walk, error, or other offensive play. Stolen bases reflect a player’s speed, timing, and aggressiveness on the basepaths and are a key component of small ball strategy.

What Is a Stolen Base (SB) in Baseball?

A stolen base occurs when a baserunner legally advances to the next base during the pitcher's delivery to home plate, typically from first to second or second to third. The official scorer awards an SB only if the runner's advancement is unaided by a hit, sacrifice, defensive error, or wild pitch.

When Does a Stolen Base Count?

The runner must be attempting to steal before the pitch is delivered.
The advance must occur during the pitcher’s motion toward home plate.
No defensive error or passed ball can be involved.
The runner must reach the next base safely without assistance from a hit or walk.

How Is SB Different From Other Baserunning Advances?

Not every successful baserunning move counts as a stolen base. The official rules distinguish SB from several similar actions:

Key Differences

Wild Pitch or Passed Ball: If the catcher fails to catch the pitch and the runner advances, it’s not an SB.
Defensive Indifference: In late-game situations with a large lead, teams may not attempt to stop a steal; the official scorer may deny an SB.
Catcher’s Interference: If the catcher hinders the batter, any advancement isn’t counted as a steal.

Season	MLB Leader (SB)	Team	Stolen Bases	Capture Rate (%)
2024	Ronald Acuña Jr.	Atlanta Braves	73	86.8
2023	Elly De La Cruz	Cincinnati Reds	65	79.3
2022	Bobby Witt Jr.	Kansas City Royals	49	81.7
2021	Jonathan Villar	Miami Marlins	41	76.5
2020	Trea Turner	Los Angeles Dodgers	27	87.1

Table data source:1, 2

The table shows recent MLB stolen base leaders, highlighting both volume and efficiency. Ronald Acuña Jr.’s 73 steals in 2024 mark the highest single-season total since 2007, demonstrating a resurgence of aggressive baserunning. Notably, top performers maintain high capture rates above 80%, balancing risk and reward effectively.

Why Are Stolen Bases Important?

Stolen bases contribute significantly to offensive pressure and run production. A successful steal puts runners in scoring position, increasing the likelihood of runs without requiring a hit.

Strategic Advantages of SB

Increases run expectancy by moving into scoring position (e.g., second to third).
Disrupts pitcher rhythm and forces quicker deliveries.
Puts psychological pressure on the catcher and pitcher.
Enables tactics like the hit-and-run or suicide squeeze.

SB and CS: Understanding Success Rates

While SB measures success, Caught Stealing (CS) tracks failed attempts. Modern analytics emphasize net basestealing value, often using the break-even rate—the minimum success rate needed for steals to be beneficial.

Break-Even Stolen Base Rate

Generally, a 75%–80% success rate is considered break-even, depending on game context. Below this threshold, the cost of outs outweighs the benefits of extra bases.

Success Rate	Net Run Value per Attempt
<70%	-0.25 runs
75%	-0.05 runs
80%	+0.10 runs
>85%	+0.25 runs

Table data source:3

Data indicates that elite basestealers (80%+ success) generate positive run value. Teams now prioritize efficiency over sheer volume, aligning with modern sabermetric principles.

Frequently Asked Questions About SB in Baseball

What does SB mean in baseball stats?

SB stands for Stolen Base, awarded when a runner advances one base unaided during the pitcher’s delivery. It is recorded in box scores and player statistics to measure basestealing success.

Is a home run included in SB?

No, a home run is not related to SB. SB only applies to advancing one base during a pitch without a hit. A home run is a separate offensive event where the batter circles all bases on one hit.

Does a stolen base count as an at-bat?

No, a stolen base does not count as an at-bat. At-bats are reserved for plate appearances ending in a hit, out, or error (excluding walks and sacrifices). SB is a baserunning stat, not a batting one.

Can you steal first base in baseball?

Under standard MLB rules, you cannot steal first base. However, in 2023, the Atlantic League introduced a rule allowing batters to “steal” first on uncaught third strikes. This experimental rule has not been adopted in MLB as of 2025.

Who holds the record for most SB in a season?

Rickey Henderson holds the modern-era record with 130 stolen bases in 1982. In 2024, Ronald Acuña Jr. led MLB with 73 SB, the highest total in over 15 years, signaling a renewed emphasis on speed.