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
34 first basemen are on MLB rosters right now, and the median one is 6' 0" and 216 lb.
- On rosters
- 34
- Median height
- 6' 0"
- Median weight
- 216 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.
- 1Matt OlsonATL40
- 2Pete AlonsoBAL38
- 3Rafael DeversSF37
- 4Munetaka MurakamiCHW32
- 5Sal StewartCIN32