Playoff Scenario Lab

Bracket Builder

Build a custom College Football Playoff field, auto-fill seeds from major ranking sources, and share the full bracket through URL-safe state.

Build bracketView rankings archive

Format sandbox

Switch between current CFP formats and experimental expansion models without leaving the page.

Auto-fill seeds

Start from CFP, AP, Coaches, SP+, or site-specific rankings, then override any slot manually.

Portable sharing

Copy a URL-safe payload or export JSON when the bracket gets too large for a link.

FormatOfficial + experimental
SeasonSelect ranking season
Ranking sourceAuto-fill source
Seeds

Click a seed to activate swap.

0/12 filled
First Round
Round first_round
4 games
FR1
FR2
FR3
FR4
Quarterfinals
Round quarterfinals
4 games
QF1
QF2
QF3
QF4
Semifinals
Round semifinals
2 games
SF1
SF2
Championship
Round championship
1 games
CFP
Champion
Winner of Championship
Pick winners to crown a champion.
Team search & swap

Choose a seed slot then click a team to assign it.

Select a seed
CFP (12-Team, Current)

Format rules & notes

Official
  • 12 teams; seeding: straight ranking
  • 6 auto-bids (highestRankedConferenceChamps)
  • 6 at-large bids
  • 4 byes: 1, 2, 3, 4
  • Straight seeding with top four byes. No reseeding after the first round. Auto-fill prefers CFP Rankings when available.
Validation
Ready
Warnings
  • Only 0 of 12 seeds are filled.