How the UEFA Champions League Works
The UEFA Champions League (UCL) is the most prestigious club football competition in the world. Starting in 2024-25, it uses a new format with a 36-team league phase followed by knockout rounds. This page explains how it all works.
A few terms before we start
- Tie — a two-legged matchup between two clubs. In American usage “tie” means a draw, but in soccer a tie is the whole series — Leg 1 plus Leg 2 combined — and only one team advances.
- Leg — one of the two matches in a tie. Each team hosts once.
- Aggregate — the total goals scored across both legs. The team with the higher aggregate wins the tie.
- Draw — two different meanings: (1) a single match that ends level in score, and (2) the bracket draw that assigns which teams face each other.
Overview
The UCL season runs from September through late May. It begins with a league phase where 36 teams each play 8 matches, then transitions to knockout rounds culminating in a single-match final.
League Phase (Sep-Jan) → Knockout Round Playoffs (mid-late Feb) → Round of 16 (Mar) → Quarter-Finals (Apr) → Semi-Finals (late Apr-early May) → Final (late May / early June)
Note: UEFA publishes target weeks for each round, but the exact match dates vary year to year. The flow above reflects the 2025-26 schedule — dates in other seasons can shift by a week or more.
League Phase
All 36 teams are placed in a single league table (no groups). Each team plays 8 matches — 4 home and 4 away — against 8 different opponents drawn from 4 seeding pots. This is sometimes called a “Swiss-system” format.
Teams earn 3 points for a win, 1 point for a draw, and 0 for a loss. On the final matchday, all 18 matches kick off simultaneously to prevent unfair informational advantages.
Where a team finishes in the table determines their fate:
Positions 1-8: Advance directly to the Round of 16 (skip the playoff round)
Positions 9-24: Enter a knockout playoff round (two-legged ties) — winners advance to the Round of 16
Positions 25-36: Eliminated from all European competition for the season
Tiebreakers when teams are level on points: head-to-head points → head-to-head goal difference → head-to-head away goals → overall goal difference → overall goals scored.
Knockout Round Playoffs
The Knockout Round Playoffs are a separate round from the Round of 16 — think of it as a play-in for the lower half of the league-phase bracket. Only teams that finished 9th through 24th in the league phase are involved; teams 1-8 skip this round entirely.
Teams involved: 16 clubs (seeds 9-24)
Format: Two-legged ties, home & away. Seeds 9-16 host the second leg.
Pairings: 9v24, 10v23, 11v22, 12v21, 13v20, 14v19, 15v18, 16v17
Outcome: 8 winners advance to the Round of 16 and join teams 1-8. The 8 losers are eliminated.
Typical timing: Mid-to-late February (Leg 1 and Leg 2 played one week apart)
This round only exists under the 36-team format (2024-25 onwards) — the old 32-team group-stage era went straight from the group stage to the Round of 16.
Round of 16, Quarter-Finals, Semi-Finals
From the Round of 16 through the Semi-Finals, each matchup is decided over two legs — one match at each team's home ground. The team with more goals on aggregate across both legs advances. The bracket is pre-drawn at the end of the league phase, so your entire potential path is locked in before the knockouts begin.
Round of 16: 16 clubs — the 8 league-phase top seeds + the 8 Knockout Round Playoff winners. Typically March.
Quarter-Finals: 8 teams, two-legged ties. Typically early-to-mid April.
Semi-Finals: 4 teams, two-legged ties. Typically late April to early May.
Final: Single match at a neutral venue — see the separate section below.
“Round of 16” and “Knockout Round Playoffs” are different rounds that sit next to each other in the calendar, which can be confusing. The Playoff round is the play-in; the Round of 16 is the first round of the main knockout bracket.
The Final
Unlike every prior knockout round, the Final is a single match at a neutral venue chosen by UEFA years in advance. It is typically played on the last Saturday of May or the first Saturday of June. The 2025-26 final is scheduled for Saturday, May 30, 2026 at Puskás Aréna in Budapest.
If the Final is tied after 90 minutes, 30 minutes of extra time are played, followed by a penalty shootout if still level.
Two-Legged Ties & Aggregate Scoring
In a two-legged tie, each team hosts one match. The aggregate score (total goals across both legs) determines who advances.
For example, if Team A wins the first leg 2-1 at home, and Team B wins the second leg 1-0 at home, the aggregate is 2-2. When the aggregate is tied:
1. 30 minutes of extra time are played (two 15-minute halves) in the second leg
2. If still tied after extra time, a penalty shootout decides the winner
Note: The away goals rule was abolished by UEFA in 2021. A tied aggregate is simply tied, regardless of where goals were scored.
The UEFA Competition Ecosystem
The Champions League is the top tier of three parallel European club competitions:
UEFA Champions League (Tier 1)
The most prestigious club competition in the world. Features the best clubs from top European leagues.
UEFA Europa League (Tier 2)
Same 36-team league phase format. Features clubs that finish just below UCL qualification in their domestic leagues. The Europa League winner qualifies for next season's UCL.
UEFA Europa Conference League (Tier 3)
The newest European competition (launched 2021). Features clubs from smaller leagues and lower domestic finishers.
During qualifying rounds, teams eliminated from UCL can drop down to Europa League qualifying, and from Europa League to Conference League. However, once the league phase begins, teams finishing 25th-36th are eliminated entirely — they do not drop to a lower competition.
How Teams Qualify for the Champions League
The number of UCL spots each country receives depends on its UEFA country coefficient — a rolling 5-year average of how well its clubs perform in European competitions.
Top 5 leagues (England, Spain, Germany, Italy, France): 4 teams each enter directly
6th-ranked league: 3 teams
7th-15th ranked: 2 teams each (league champions + runners-up)
16th-55th ranked: 1 team (league champion, must go through qualifying rounds)
The defending UCL champion automatically qualifies even if they don't finish high enough in their domestic league.
Why It Matters
The Champions League Final is the most-watched annual sporting event in European football and arguably the single biggest match in club football worldwide. Winning it is the pinnacle of achievement for any club.
Real Madrid leads the all-time winners list with 15 titles, followed by AC Milan (7), Bayern Munich (6), Liverpool (6), and Barcelona (5).