Games behind: how to read a standings table
Baseball and basketball standings usually include a column marked GB, for "games behind". It tells you how far a team trails the leader in a way that's easier to picture than a difference in winning percentage. This guide explains the formula, why you sometimes see half games, and how it leads to the "magic number" for clinching a title.
What games behind means
Games behind is the number of games a team would have to make up to draw level with the leader. "Making up" a game means the trailing team wins one more and the leader loses one more. Each of those halves counts as half a game.
The leader always shows a dash (–) or 0.0 in the GB column.
The formula
GB = ((Leader's wins − Team's wins) + (Team's losses − Leader's losses)) ÷ 2
You add the gap in wins to the gap in losses and halve the total.
Worked example
| Team | W | L | Pct | GB |
|---|---|---|---|---|
| Harbor City | 60 | 40 | .600 | – |
| Northport | 57 | 42 | .576 | 2.5 |
| Lakeside | 55 | 44 | .556 | 4.5 |
| Riverton | 50 | 52 | .490 | 11.0 |
For Northport: the win gap is 60 − 57 = 3, the loss gap is 42 − 40 = 2, so GB = (3 + 2) ÷ 2 = 2.5.
For Riverton: (60 − 50) + (52 − 40) = 10 + 12 = 22, and 22 ÷ 2 = 11.0.
(The teams are made up for the example.)
Why half games happen
Half games appear when two teams have played a different number of games. In the example, Harbor City has played 100 games and Northport 99. If Northport wins its extra game, it moves to 58-42 and is 2.0 games behind. If it loses, it's 57-43 and 3.0 behind. The half game sits between those two outcomes.
Games behind vs winning percentage
Standings are ordered by winning percentage, not games behind, and the two can disagree. A team that has played fewer games can have a better percentage while showing more games behind, or the other way round. It doesn't happen often, but it's why winning percentage is the official ranking and GB is a guide.
Games behind is most useful late in a season, when you want a feel for how much ground a team can realistically make up in the games left.
The magic number
Near the end of a season you'll hear about the leader's magic number: the combination of leader wins and chaser losses that guarantees the leader finishes ahead.
Magic number = Games in season + 1 − Leader's wins − Chaser's losses
Say the season is 162 games, the leader is 95-55 and the second-place team is 86-64. The magic number is 162 + 1 − 95 − 64 = 4. Any mix of 4 leader wins and chaser losses clinches it: four leader wins, four chaser losses, or two of each.
The "+1" is there to avoid a tie. Without it you'd only guarantee finishing level. Leagues with tiebreakers may clinch one game sooner if the leader already holds the tiebreaker. See how tiebreakers work.
What about football tables?
Football leagues use points, not wins and losses, so GB isn't used. The equivalent is the points gap and games in hand: a team 4 points behind with two games in hand could overtake the leader by winning both. To compare teams that have played different numbers of games, use points percentage, explained in the winning percentage guide.
Quick checklist
- GB adds the gap in wins and the gap in losses, then halves it.
- A half game means the two teams have played a different number of games.
- Rankings follow winning percentage; GB is a guide to the gap.
- Magic number = season games + 1 − leader's wins − chaser's losses.