Knockout
Fewest matches, shortest day — 16 teams only need 15 matches. The drawback is that half your teams will travel only to play once and go home.
One-day tournaments have one hard constraint: daylight. Everything else — format, bracket, timings — depends on how many matches you can physically fit in a day. This guide works through it in order.
Start from the arithmetic: number of teams, pitches, hours of daylight and minutes per match. That tells you which formats are actually possible before you pick one. Running a season rather than a day? Read how to start a football league.
Fewest matches, shortest day — 16 teams only need 15 matches. The drawback is that half your teams will travel only to play once and go home.
The standard tournament format. Small round robin groups guarantee everyone three or four matches, then the top sides go into a knockout. Best balance of fairness and time.
Everyone plays everyone. Fairest table, most matches, practical up to about six teams in a single day.
Nobody goes out on one bad result. More matches than a straight knockout, but far fewer than a round robin.