Eleven (11) on each side.
There are 22 players of a field at a time, 11 offense and 11 defense.
22: 11 on offense and 11 on defense
11 on defense 11 on offense
The offense and the defense can each have 11 players on the field. If they have 12 ormore players on the field when the ball is snapped they are penalized.
There are 22 players on the field at all time 11 on offense and 11 on defense
22 players are allowed on the field for a play, 11 on offense, 11 on defense.
On the field of play during a game there are 11 players on both offense and defense. On a team, where the active roster consists of 45 players, there is usually a breakdown of 21 or 22 players on both offense and defense. Two of the 45 players on the active roster are kickers (punter and placekicker) so that leaves 43 players to breakdown between offense and defense.
baseball does not have offense and defense but the people that are playing field or bat
American football has 11 plyers on offense and 11 on defense. You may play with as few as 8 but no fewer.
11 players
Football started from the game of Rugby which evolved into todays football. In the early years 1869 it took 25 members to play then in collegiate 1873 it was reduced to 20. In 1880 it was again reduced to from 15 down to 11 players.
Both teams have 11 players (22 total) on the field for one play and there are seven officials. That would make 29 people altogether on the field for a play in NFL football.