What Is BB in Baseball? Meaning, Stats & How It Works

BB in baseball stands for Base on Balls, which is the statistical term for a walk. A regular walk happens when a batter receives four balls during a plate appearance, and the batter is awarded first base.

The four balls do not have to be consecutive. Strikes can occur between them as long as the batter does not strike out before reaching ball four.

BB appears in both hitting and pitching statistics. For a hitter, it shows walks drawn. For a pitcher, it shows walks allowed.

To understand the abbreviation in a box score, it helps to start with what the term means.

What Does BB Mean in Baseball?

BB means Base on Balls.

“Walk” is the common term for the same result, while BB is the abbreviation you will usually see in scorebooks, box scores, and player stat lines.

A batter who records a BB reaches first base without recording a hit.

For example, if a player's line shows:

3 AB, 1 H, 2 BB

That means the player had three official at-bats, recorded one hit, and also reached base twice on walks.

Now that the abbreviation is clear, the next step is understanding how a regular BB happens during an at-bat.

How Does a Batter Get a BB?

A batter gets a regular BB when the pitcher throws four pitches that are called balls before the plate appearance ends.

The pitches do not need to come one after another.

For example, a batter could work the count to 3–2. If the next pitch is outside the strike zone and the batter does not swing, it becomes ball four and the batter is awarded first base.

A walk can therefore happen even after the batter has already received one or two strikes.

Once ball four is called, the batter becomes a baserunner.

What Happens After a BB?

After a regular walk, the batter is awarded first base.

If runners are already on base, any runner who is forced to advance must move to the next base. For example, with the bases loaded, a walk forces the runner on third base home.

Statistically, the batter records a BB, not a hit.

The walk also counts as a plate appearance but does not count as an official at-bat.

That distinction becomes especially important when reading hitter and pitcher stat lines.

What Does BB Mean for Hitters and Pitchers?

BB represents the same event from two different sides of the game.

For a hitter, a BB means the batter reached first base on a walk.

For a pitcher, a BB means the pitcher allowed a batter to reach first base on a walk.

So if a hitter has 2 BB, they drew two walks. If a pitcher's line shows 2 BB, that pitcher issued two walks.

One of the most common questions after that is whether those walks count as official at-bats.

Does a BB Count as an At-Bat?

No. A BB does not count as an official at-bat.

It does, however, count as a plate appearance.

For example, if a hitter comes to the plate four times and walks once, the player may finish with four plate appearances but only three official at-bats.

This is why the number of plate appearances and at-bats on a player's stat line can be different.

Because a walk is excluded from at-bats, it also affects batting statistics differently from a hit or an out.

How Does a BB Affect Batting Average and OBP?

A walk does not count as a hit, and it does not count as an at-bat.

That means the walk itself does not directly raise or lower a player's batting average.

It does matter for on-base percentage (OBP) because the batter successfully reached base.

That gives us a simple way to remember the difference:

A BB does not count toward batting average, but it can help a player's on-base percentage.

Not every trip to first base without a hit is recorded as the same statistic, though.

What Is the Difference Between BB, IBB and HBP?

BB, IBB, and HBP can all result in the batter reaching first base, but they are recorded differently.

A standard BB is a regular walk.

An IBB is an intentional walk, meaning the defensive team chooses to put the batter on first base. Under current MLB rules, the defensive team can signal an intentional walk without having the pitcher throw four pitches.

An HBP happens when the batter is hit by a pitch and is awarded first base. It is recorded as HBP, not BB.

These distinctions matter because each event appears separately in baseball statistics.

Why Are Walks Important in Baseball?

Walks give hitters a way to reach base without needing a hit.

For hitters: Drawing walks can show patience and the ability to avoid swinging at pitches outside the strike zone.

For pitchers: Allowing too many walks can create baserunners without forcing the opposing team to put the ball in play.

That is why BB is a useful stat for evaluating both sides of a plate appearance.

A few quick questions help clear up the most common box-score confusion.

What Is BB in Baseball? The Bottom Line

BB stands for Base on Balls, the statistical term for a walk.

A regular BB occurs when a batter reaches four balls during a plate appearance and is awarded first base.

A BB does not count as a hit or an official at-bat, but it does count as a plate appearance and can help a hitter's on-base percentage.

For hitters, BB means walks drawn. For pitchers, it means walks allowed.

When you see BB in a baseball box score, think “walk.”