How Many Pitchers on a Baseball Team in MLB?

By Sarah Miller · April 2, 2050

In Major League Baseball (MLB), a team typically carries 13 pitchers on its active roster during the regular season, as per current league rules. This standard was established to balance strategic flexibility and player workload management.

Understanding Pitcher Roster Limits in MLB

The number of pitchers allowed on a baseball team's active roster has evolved over time. Since the 2019 collective bargaining agreement, Major League Baseball set a limit of 13 pitchers on the 26-player active roster. This replaced the previous norm of 25 players with no strict cap, which often led to teams carrying 12 or more pitchers.

Why the 13-Pitcher Limit Was Introduced

To reduce overuse of relief pitchers and promote pitcher health
To encourage more strategic use of starting pitchers
To increase game pace by limiting frequent pitching changes
To ensure position players remain integral to team composition

Breakdown of a Typical 13-Pitcher Rotation

A well-structured pitching staff includes a mix of starters and relievers. Here’s how the 13 spots are generally allocated:

Pitcher Role	Typical Count	Key Responsibilities
Starting Pitchers	5	Begin games, aim for 5–7 innings per start
Long Relievers	1–2	Cover multiple innings when starter exits early
Middle Relievers	2	Bridge gap between starter and late-inning specialists
Setup Men	1–2	Pitch 8th inning, prepare for closer
Closer	1	Finish high-leverage 9th inning situations
Left-Handed Specialists	1	Face tough left-handed batters in key moments
Spot Starters / Swingmen	1	Flexible role: start or relieve based on need

Table data source:1, 2

The data shows that modern MLB teams rely heavily on specialized roles within their pitching staff. Having five starters supports a standard rotation, while the remaining eight relievers allow tactical advantages in late-game scenarios. Teams often adjust these numbers slightly based on injuries, matchups, or doubleheaders.

Variations Across Seasons and Leagues

While 13 is the standard in MLB regular seasons, exceptions exist:

Opening Day: Teams may temporarily carry 14 pitchers under special circumstances.
September Call-Ups: When rosters expand from 26 to 28 players, teams can add up to 14 pitchers.
Doubleheaders: Clubs are allowed 14 pitchers for single-day twin bills.
Postseason: Rosters shrink to 26 players with maximum 13 pitchers; careful selection is critical.

Outside MLB, roster sizes differ significantly:

Minor Leagues: Triple-A teams follow similar 13-pitcher rules.
College Baseball: No formal limits; staffs vary widely by program and NCAA division.
High School: Typically 8–10 pitchers due to smaller rosters and eligibility rules.
NCAA Tournament: Teams often carry 10–12 pitchers for depth.

Frequently Asked Questions About Baseball Pitchers

How many pitchers are allowed on an MLB team’s active roster?

As of the 2025 season, Major League Baseball allows a maximum of 13 pitchers on the 26-player active roster during the regular season, with limited exceptions for doubleheaders and September roster expansions.

Can a team carry more than 13 pitchers in MLB?

Yes, but only under specific conditions. Teams may carry 14 pitchers during doubleheaders or when rosters expand to 28 players in September. Otherwise, exceeding 13 results in penalties or mandatory adjustments.

What happens if a team goes over the 13-pitcher limit?

If a team exceeds the 13-pitcher limit, it must make immediate roster adjustments—such as placing a pitcher on the injured list or optioning one to the minors—or face fines and potential forfeits as enforced by MLB officials.

How many starting pitchers does a team usually have?

Most MLB teams maintain a five-man starting rotation, meaning they regularly use five starting pitchers. Some may shift to a six-man rotation during injury crises or expanded playoff pushes.

Do all 13 pitchers play in every game?

No. Only a few pitchers participate in any given game—typically one starter and 2–4 relievers. The full 13-pitcher staff provides depth for scheduling, travel, injuries, and strategic matchups across a 162-game season.