Katarinavs Irelia
Katarina vs Irelia is a decisive matchup in LoL patch 26.19. Irelia wins with a 65.4% win rate (+30.8%) over Katarina based on 26 games. Irelia holds the advantage in both the early and late game. Below you'll find the best Katarina build, runes, laning stats, and strategies for the Katarina vs Irelia matchup.
Katarina Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Katarina performs against them. You'll get head-to-head win rates, laning stats, the best build and runes for the matchup, and early vs late game analysis — all based on real ranked data.
Who wins Katarina vs Irelia?
Katarina wins 40.8% of these games. With this many games the true rate is most likely between 30.2% and 52.5% (95% range).
- Expected
- 50.9% From both champions' overall Mid win rates
- Matchup effect
- −10.1 pts Observed minus expected
- Sample
- 71 games Lane: Mid
- vs patch 26.18
- −12.1 pts Within normal patch-to-patch noise
Lane: Mid · Ranked Solo/Duo & Flex · North America server · All ranks · Patch 26.19 · Sep 24 – Sep 28
They also met in another lane (Top): 5 games, Katarina won 60.0%.
Key takeaways
- Current data slightly favors Irelia, but the sample is too limited for a strong conclusion: Katarina wins 40.8% of 71 games (95% range 30.2–52.5%).
- Both champions' overall Mid win rates predict 50.9% for Katarina; the result is within the margin of error of that, so this matchup mostly reflects the two champions' general strength.
- Irelia usually wins the lane: 1,052 gold ahead of Katarina at 15 minutes on average (69 games with a 15-minute snapshot).
- Katarina players pick Lich Bane much less often against Irelia: 54.3% of their other Mid games, 38.0% here.
How we calculate this
Games: ranked Solo/Duo and Flex games on the North America server from the patch shown. Remakes (games under 5 minutes) are excluded.
A game only counts when Katarina and Irelia played the same position on opposite teams, so roaming, lane swaps within a team or a champion merely being in the same game never count as this matchup.
The 95% range is a Wilson score interval. Confidence comes from how wide that range is: within ±3 points is very high, ±5 high, ±8 moderate, anything wider low. Below 20 games a matchup is not classified at all.
Expected win rate combines both champions’ win rates in this lane (same games and filters) with the log5 formula: E = A(1−B) / (A(1−B) + B(1−A)). Matchup effect = observed − expected.
"What changes" compares Katarina's choices in this matchup with the same champion's other games in the same lane, and lists a change only when it is at least 3 points and statistically significant (two-proportion z-test, |z| ≥ 2, 20+ games).
Results are not split by rank: the sample per rank is too small for honest per-rank matchup numbers.
Katarina vs Irelia Laning Stats
At 15 minutes
Whole-game averages
Katarina vs Irelia Win Rate by Game Length
Katarina's win rate against Irelia by game length. The dot is the win rate, the bar its 95% range and the dashed line the champion's usual win rate at that length. Lengths with fewer than 25 games are left blank.
No game length stands out: Katarina's results against Irelia in short and long games are within the margin of error of each other.
Katarina vs Irelia Power Spikes
Who is ahead at each stage, measured from these games. A stage reads "Even" when the difference is inside the margin of error, and "Insufficient data" when there are too few games to tell.
- Lane (15 min)IreliaKatarina gold at 15: −1,052
- First itemEvenKatarina: 10.5 min · Irelia: 10.3 min
- Games under 20 minInsufficient data
- 20–30 min gamesInsufficient data
- 30+ min gamesInsufficient data
What Katarina Changes Against Irelia
Choices Katarina players make noticeably more or less often in this matchup than in their other Mid games.
Lich BaneItemUsually54.3%vs Irelia38.0%−16.3 pts44.4% WR here
Chainlaced CrushersBootsUsually14.4%vs Ireliaunder 2%−14.4 pts- Q > W > Ethe Q > W > E skill orderSkill priorityUsually1.2%vs Irelia8.5%+7.3 pts
Armored AdvanceBootsUsually7.2%vs Irelia14.1%+6.8 pts
Health Scaling (flex)Stat shardUsually1.3%vs Irelia5.6%+4.4 pts
Adaptive Force (flex)Stat shardUsually98.3%vs Irelia94.4%−3.9 pts43.3% WR here
Best Katarina Build vs Irelia
Usual Katarina build (Mid)
85.7% win rate · 49 games
Against Irelia
Not enough matchup-specific build data: only 11 of 45 Katarina games against Irelia carried a complete build, which is too few to recommend an item path from. Use Katarina's standard build instead.
- Katarina usually completes Lich Bane first, at 10.5 min (median of 23 games).
- Irelia usually completes Blade of The Ruined King first, at 10.3 min (median of 63 games).
- Skill priority: Q > E > W — the same as usual.
Builds are ranked by the lower edge of their win rate range, not the raw win rate, so a build seen in a handful of wins never outranks a proven one.
Best Katarina Runes vs Irelia
Usual Katarina runes (Mid)
Electrocute
60.6% win rate · 71 games
Against Irelia
Too few games for a matchup-specific rune page yet — use the usual page.
Plan your Katarina draft in Draft Lab
Draft Lab lays out both teams lane by lane with live matchup win rates, damage profiles and game-phase lean, and suggests picks and bans from current meta data.
- Full 5v5 draft board
- Lane matchup win rates
- Pick and ban suggestions
Katarina matchup data for League of Legends patch 26.19. The table below shows Katarina's win rate, gold difference, and performance stats against every champion in the current meta. Click any champion name to see a detailed head-to-head breakdown including the best Katarina build, runes, laning stats, and early vs late game analysis for that specific matchup.
Other Katarina Matchups
Hardest for Katarina
Easiest for Katarina
Win rate and games for each matchup. Lists are ranked by the edge of the 95% range so small samples cannot top them; matchups with at least 50 games only.
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.
Katarina vs Irelia FAQ - Patch 26.19
Who wins Katarina vs Irelia?
Current data slightly favors Irelia, but the sample is too limited for a strong conclusion: Katarina wins 40.8% of 71 games (95% range 30.2–52.5%).
What is Katarina's win rate against Irelia?
Katarina wins 40.8% of 71 Mid games against Irelia on patch 26.19 (95% range 30.2–52.5%). Based on both champions' overall Mid win rates, 50.9% would be expected.
Does Katarina counter Irelia?
Not clearly. Katarina wins 40.8% of 71 games against Irelia, and the 95% range (30.2–52.5%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Katarina or Irelia?
Irelia usually wins the lane: 1,052 gold ahead of Katarina at 15 minutes on average (69 games with a 15-minute snapshot).
Does Katarina outscale Irelia?
There are too few games of each length to tell yet.
When is Irelia strongest against Katarina?
Irelia is measurably ahead in: Lane (15 min).
What should Katarina build against Irelia?
There are not enough games for a matchup-specific core, so use Katarina's usual Mid core: Shadowflame, Lich Bane, Mejai's Soulstealer. The biggest change against Irelia: Lich Bane (54.3% usually, 38.0% here).
What runes should Katarina use against Irelia?
Use Katarina's usual Electrocute page (Domination + Resolve); there are too few games for a matchup-specific page. The biggest change against Irelia: Health Scaling (flex) (1.3% usually, 5.6% here).