This will depend upon the number of teams and your budget. The three primary formats are:
- Single-Elimination: Each team plays until they have lost once. This format is the most economical but the least aggressive. The formula for games played is: x-1 where x is the number of teams. For 16 teams, 15 games will be played.
- Double-Elimination: Each team plays until they have lost twice. This format allows teams to "come back" from a loss. The formula for games played is: 2x-1 where x is the number of teams. For 16 teams, 31 games will be played.
- Round Robin: Every team play every other team. The winner is the team with the best overall record. You can create "leagues" or "divisions" to divide the teams and reduce the number of packets needed. The formula for games played is: x(x-1)/2 where x is the number of teams. For 7 teams, 21 games will be played.
You can combine formats. If you have 24 teams, you can use a single-elimination tournament (in 2 rooms simultaneously) to reduce the number of teams to 3 (18 games played with 9 packets). Then, those 3 play a Round Robin in a single room (3 games played using 3 packets). The total number of games played is 21, but only 12 game packets will be needed. For more information on tournament formats, consult the Online Tournament Calculator.