- Win Rate
- 51.1%
- Pick Rate
- 1.1%
- Ban Rate
- 0.6%
Karthus Synergies & Best Teammates
- Patch
- 26.20
- Games
- 1,420
- Lane
- All Lanes
- Tier
- All Tiers
- Last Updated
- Oct 14, 2026 UTC
- Methodology
- Data Methodology
- Author
- Dakota Chinnick
Who Karthus wins with in Patch 26.20: every teammate in every role, measured against what both champions win on their own, so a strong pair is real synergy and not two strong champions.
Karthus Synergies - Patch 26.20
18 teammate pairings measured
Best top laners with Karthus
| Teammate | Win Rate | Synergy | Games |
|---|---|---|---|
 Garen | 56.0% | +3.8 | 50 |
Weakest pairings
| Teammate | Win Rate | Synergy | Games |
|---|---|---|---|
 Malphite | 41.5% | −9.9 | 41 |
Best supports for Karthus
Weakest pairings
Synergy is the win rate with that teammate minus the win rate the two champions would be expected to reach together from their own win rates in their roles (log5). Lists are ranked by the low end of each synergy's 95% range, so a small sample cannot lead a list on luck alone.
Karthus Team Synergy Checker
Pick your teammates
Pick your teammates to see how each one moves Karthus's Jungle win rate, and an estimate for the whole team.
An estimate: it adds each pairing's measured synergy on the odds scale and assumes the pairings are independent. Real teams also depend on the enemy draft and the players.
Help us maintain accuracy! If you notice incorrect stats, missing data, or any issues, your feedback directly improves the quality of our data for the entire community.
Karthus Synergies FAQ - Patch 26.20
How is synergy calculated?
From ranked solo and flex games this patch: the win rate when both champions are on the same team, minus the win rate expected from each champion's own win rate in its role. A positive number means the pair wins more together than their individual strength explains. Pairings need at least 40 games to be listed.