Baseball game tracking guides

30 — current Major League Baseball teams

How many MLB teams are there? All 30 teams by league and division

MLB has 30 teams: 15 in the American League and 15 in the National League. See every club, division, and current home ballpark.

162 — regular-season games scheduled for each MLB team

How many games are in an MLB season? The 162-game schedule explained

Each MLB team is scheduled for 162 regular-season games, creating 2,430 games across the league. See what counts and how the schedule works.

9 — innings scheduled for a regulation MLB game

How many innings are in a baseball game? Nine-inning MLB rules explained

An MLB game is scheduled for nine innings. Learn how half-innings, outs, walk-offs, rain-shortened games, and extra innings change the final total.

2:38 — average length of a nine-inning MLB game in 2025

How long is a baseball game? MLB average time and ballpark planning

A nine-inning MLB game averaged 2 hours 38 minutes in 2025. See what makes games longer or shorter and how much time to plan at the ballpark.

26 — players on a standard active MLB roster

MLB roster size in 2026: 26 active players

MLB teams carry 26 active players through August and in the postseason, then 28 in September. Learn how the 40-man roster and 27th-man rule work.

9 — defensive positions on a baseball field

The 9 baseball positions: numbers, names, and what each player does

Learn all nine baseball positions and scorekeeping numbers: pitcher 1, catcher 2, infielders 3–6, and outfielders 7–9, plus the DH and 6-4-3 plays.

R H E — line-score totals: runs, hits, and errors

How to read a baseball box score, one section at a time

Learn the line score, batting and pitching columns, baseball abbreviations, decisions, substitutions, and the stats behind a completed game.

OBP + SLG — formula for on-base plus slugging

What OPS means in baseball and how to calculate it

OPS means on-base plus slugging. Learn the OBP + SLG formula, work through an example, read the number, and understand how OPS differs from OPS+.

9 × ER ÷ IP — formula for earned run average

What ERA means in baseball and how to calculate it

ERA means earned run average. Learn the 9 × ER ÷ IP formula, calculate examples, read partial innings, and see why earned and unearned runs differ.

RBI — run batted in

What RBI means in baseball and when a hitter gets one

RBI means run batted in. Learn when hits, home runs, sacrifice flies, outs, walks, hit batters, errors, and double plays do or do not earn an RBI.

(BB + H) ÷ IP — formula for walks and hits per inning pitched

What WHIP means in baseball and how to calculate it

WHIP means walks and hits per inning pitched. Learn the (BB + H) ÷ IP formula, work through examples, read partial innings, and compare WHIP with ERA.

How to track every baseball game you attend

Track baseball games attended with scores, ballparks, seats, photos, players, home runs, and lifetime fan stats in one Gamebook record.

How to track baseball games you attended

Learn how to track baseball games you attended, backfill old games from tickets and photos, and turn your attendance log into a ballpark passport.

Baseball stadium checklist app for parks you visit

Use Gamebook as a baseball stadium checklist and ballpark passport. Log games, parks, seats, players, photos, and memories across current and historic MLB ballparks.

Looking for a Letterboxd for baseball? Start with the games you saw live

Gamebook is a personal baseball diary for games you attend, with a game log, ballpark passport, lifetime stats, friends, and witnessed players.

Download a free MLB ballpark passport template

Download a free printable, fillable PDF or editable CSV with all 30 active MLB parks, then save each visit and game memory.

Free baseball game log template for games you attend

Download a free printable baseball game log or editable CSV for recording games attended, scores, ballparks, seats, companions, and memories.

MLB stadium capacities in 2026: all 30 ballparks ranked

Dodger Stadium is largest at 56,000; Sutter Health Park is smallest at 14,014. See all 30 MLB stadium capacities ranked and the 40,899 average.

Which MLB stadium has the deepest center field in 2026?

Coors Field has MLB's deepest straightaway center field at 415 feet in 2026. Compare center-field and foul-line distances for all 30 ballparks.

MLB stadium locations map 2026: all 30 ballparks and addresses

Explore an interactive map of all 30 MLB stadiums in 2026, with every ballpark's city, street address, directions, team, and full Gamebook park guide.

MLB stadium name changes: old and current ballpark names

Match old MLB stadium names such as Jacobs Field, Safeco Field, Miller Park, and Minute Maid Park to their current 2026 ballpark names.

MLB stadium parking and transit guide for all 30 ballparks

Plan parking or public transit for every MLB stadium in 2026, with a practical starting point and a direct official MLB guide for all 30 ballparks.

MLB stadiums by age in 2026: oldest to newest

Rank all 30 current MLB stadiums from oldest to newest in 2026, with opening year, current team arrival, age, and an official MLB source for each park.

Historic MLB stadiums: 32 former ballparks to track

Explore Gamebook's curated list of 32 former MLB home stadiums, from Forbes Field and Ebbets Field to the Kingdome, Shea Stadium, and Oakland Coliseum.

How many MLB stadiums have retractable roofs in 2026?

Seven MLB stadiums have retractable roofs in 2026. Tropicana Field is the eighth covered park, but its dome is fixed. See all eight roof types and teams.

MLB stadiums with artificial turf in 2026: all 5 parks

Five MLB stadiums use artificial turf in 2026 and 25 use natural grass. See every turf park, its current surface, and the complete grass list.

Which side is the home dugout? 19 first base, 11 third base

In 2026, 19 MLB teams use the first-base dugout and 11 use the third-base dugout. Check the home side at all 30 parks before choosing seats.

MLB stadium bag policies for all 30 ballparks in 2026

Check the 2026 bag policy, standard size limit, and official club source for every current MLB stadium before you leave for the game.

MLB Players' Weekend 2026: dates, custom gear, and auction

MLB Players' Weekend ran Aug. 21-23, 2026. Revisit the custom gear, find official auction links, and save the game you attended.

2026 MLB Little League Classic: Braves 4, Brewers 2

The Braves won the 2026 Little League Classic 4-2 on Aug. 23. Find the Bowman Field venue guide, archived ticket details, and a link to log your game.

When does the 2027 MLB season start? March 24

The 2027 MLB season starts March 24, with traditional Opening Day March 25. See the All-Star Game, Rivalry Weekend and final-day dates.

2026 MLB playoff format: 12 teams, seeds, and byes

The 2026 MLB playoffs have 12 teams. See the six seeds in each league, Wild Card matchups, first-round byes, series lengths, and tiebreakers.