The AFL finals format, explained
The AFL's top-8 system is built around one privilege: the double chance. Finish top four and you can lose a final and still win the flag. Finish fifth to eighth and every week is an elimination. That single design choice shapes the whole September — and most of August's jockeying.
Week one: two different competitions
| Final | Who | Loser's fate |
|---|---|---|
| Qualifying Final 1 | 1st v 4th | Lives (home semi-final) |
| Qualifying Final 2 | 2nd v 3rd | Lives (home semi-final) |
| Elimination Final 1 | 5th v 8th | Season over |
| Elimination Final 2 | 6th v 7th | Season over |
Week two: semi-finals
- QF1 loser hosts EF1 winner.
- QF2 loser hosts EF2 winner.
Both are knockouts. The qualifying-final losers get the home ground and the extra week's evidence; the elimination winners arrive battle-hardened but often travelling.
Week three: preliminary finals
- QF1 winner hosts a semi winner.
- QF2 winner hosts the other semi winner.
The prize for winning a qualifying final is brutal in its simplicity: a week off, then a home preliminary final — statistically the most valuable home game in footy. Prelims are where the double chance cashes out.
Week four: the Grand Final
The two prelim winners meet at the MCG on the last Saturday in September (contractually, whatever the ladder said). One team's season ends in a premiership; twenty-one others get a draft pick and a review.
The maths of ladder position
Why clubs treat fourth vs fifth as a chasm:
- From top 4: two wins from a Grand Final, a mulligan available, and likely home finals. Historically the vast majority of premiers come from the top four — flags from outside it are famous because they're rare.
- From 5th–8th: four straight knockout wins required, usually with travel, against progressively better sides. It's been done — it's just the hard way around.
- Percentage matters: ties on wins are split by percentage (points for ÷ points against), which is why late-season blowouts against battlers are genuinely strategic, not just rude.
Simulating September
Because each final is just a game with a win probability, you can chain the bracket: simulate week one thousands of times, feed winners forward, and count how often each club reaches each stage. That's exactly what FootyAI's Premiership Predictor does with model probabilities — turning "we're a chance" into "we make the prelim 31% of the time, and it's 55% if we snatch fourth". The run home stops being vibes and becomes scenarios.
Run the September scenarios
FootyAI's Premiership Predictor simulates the finals from live ladder positions and model probabilities — updated every round.
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