What does 1B mean in baseball?
1B is a first baseman in baseball. The fielder at first, who takes the throws that end most infield plays.
What a first baseman looks like
53 first basemen are on MLB rosters right now, and the median one is 6' 1" and 220 lb.
- On rosters
- 53
- Median height
- 6' 1"
- Median weight
- 220 lb
- Median age
- 28
The least demanding position in the field, so clubs put their biggest bat there: first basemen outhit every other position year after year.
Home Runs at the position, 2026
The median first baseman with a figure at all posted 16 home runs. These five led the position.
- 1Pete AlonsoBAL43
- 2Matt OlsonATL41
- 3Rafael DeversSF37
- 4Munetaka MurakamiCHW35
- 5Sal StewartCIN32