tBG (total Bases Generated)

tBG Reports

These reports appear in GoogleDocs and permit filtering and sorting.
Years covered: 1911-2024 (including the Federal League for 1914 and 1915).
These reports do not include all years for players who started their careers before 1911, such as Ty Cobb, who started in 1905.

Overall Team Performance

• total Team Performance
  This report combines normalized tBG+ and tBS+ team values for an overall team performance value we call "totalPerf". Can this tell us which team was the greatest ever? (This also includes many other team metrics, so maximize the report window to see all columns.)

Batting Reports

• total Bases Generated (tBG) Player Year
  tBG totals for each player per year. Qualifying criteria is the same used by MLB -- 3.1 plate appearances (PA) per game, which comes to 502 PAs for seasons with 162 games. The required PAs are lower for years with fewer games: 1972, 1981, 1994, 1995, and 2020.
   
• total Bases Generated (tBG) Player Career
  tBG career totals per player.
   
• tBG Team Year
  tBG totals for each team and year. This report identifies the teams that produced the most offense in a season.
   
• tBG Player By Team
  The bases generated by each player by team for career. Only those bases generated for the team are counted in an entry. If a player played for multiple teams, he will have a row for each team. Filter by team, and you can see who generated the most bases for your team.
   
• Most tBG by a Player in a Game
  The players who produced the most offense in a single game. Read about Walker Cooper's and Josh Hamilton's historic games.
   
• Most tBG by a Team in a Game
  Which team produced the most offense in a single game? Read about the Rangers historic thrashing of the Orioles on Aug. 22, 2007, at Camden Yards.
   
• Most tBG by Both Teams in a Game
  Which single game produced the most offense?
   
• Fewest tBG by Both Teams in a Game
  Which game had the least amount of offense?

Pitching Reports

total Bases Surrendered (tBS) by each pitcher by year, career, inning, and by team year. Starters, relievers, and closers appear in different reports. See the title pages of each report for the qualifying criteria.

Base Running Reports

Note: We recently developed an Xtra Bases (XtraB) stat, with three new reports (linked below), and added XtraB to tBGR on our base running reports for a new total called XtBGR, which is one of the most comprehensive base running stats available.

• tBGR Player Year
  total bases generated as a base runner (tBGR) for each player per year. Qualifying criteria -- 3.1 plate appearances (PA) per game, which comes to 502 PAs for seasons with 162 games. The required PAs are lower for years with fewer games: 1972, 1981, 1994, 1995, and 2020.
   
• tBGR Player Career
  tBG base running totals per player career.
   
• tBGR Team Year
  Identifies the best and worst base running teams in MLB history.
   
• Xtra Bases Player Year, Xtra Bases Player Career, and Xtra Bases Team Year --
  The bases a base runner gains on 8 specific plays in addition to the bases gained from a hit ball.
   
• Most Bases Gained as a Base Runner in a Single Game
  Highest tBGR in a single game--BEST game running the bases since 1914. Bert Campaneris (8/16/66) and Johnny Neun (7/9/27) had two of the greatest base running games in MLB history. Campaneris, for example, scored four runs and single-handedly beat the White Sox 4-2 in a game in which not one of Campaneris' teammates got an RBI.
   
• Most Bases Lost as a Base Runner in a Single Game
  Lowest tBGR in a single game--WORST game running the bases since 1914. The base running foibles of Joe Judge (9/21/16), Bing Miller (7/18/24), Clyde Barnhart (4/22/25), and Tris Speaker (7/17/27) are so historically bad, it's impossible to tell who had the worst game as a base runner in MLB history!

Glossary

Acronyms that appear in the tBG reports.

Batting Stats

tBG

total Bases Generated for a year or career (depending on the report).

tBGp

total Bases Generated adjusted for park factor.

tBGB

total Bases Generated as a batter. Includes bases generated as a batter, but not those gained as a base runner. A pure hitting stat. A subset of tBG. (tBGB + tBGR = tBG)

tBGBp

total Bases Generated as a batter adjusted for park factor. (tBGBp + tBGR = tBGp)

tBGPA

total Bases Generated per Plate Appearance.

tBGPAp

total Bases Generated per Plate Appearance, adjusted for park factor.

tBG+

tBGPAp normalized. Value for a player or team compared to the league average for that year. 100 is average, and above or below 100 indicates that the player was above or below the tBGPAp average.

PossBG

Max # of bases that can be generated for a plate appearance (min of 4 to max of 10). These are totaled and presented with the various tBG stats for a year or career.

PossBG%

Percentage of PossBG that the player actually generated.

Base Running Stats

tBGR

total Bases Generated as a base runner. Includes bases gained and lost as a base runner. These are bases not attributed to the batter but, instead, attributed to a base runner. A subset of tBG.

+tBGR

Bases gained by a player as a base runner.

-tBGR

Bases lost by a player as a base runner.

XtraB

The bases a base runner gains on certain plays in addition to the bases gained from a hit ball. Example: batter hits a single, but the base runner moves up two bases. That's 1 Xra Base. (See the Xtra Base reports for the list of plays included.)

XtBGR

Xtra Bases plus tBGR. This provides a comprehensive stats of a player's performances as a base runner.

Pitching Stats

tBS

total Bases Surrendered.

tBSp

total Bases Surrendered, adjusted for park factor.

tBSI

total Bases Surrendered per Inning Pitched.

tBSIp

total Bases Surrendered per Inning Pitched, adjusted for park factor.

tBS+

tBSIp normalized. Value for a player or team is compared to the league average for that year. Like other normalized stats (such as OPS+ and wRC+), 100 is average. A value of 105 means that the player is 5% above average.