Amumuvs Jax
Amumu vs Jax is a moderate matchup in LoL patch 26.19. Amumu wins with a 51.9% win rate (+3.7%) over Jax based on 27 games. Amumu wins the early laning phase while Jax scales better into the late game. Below you'll find the best Amumu build, runes, laning stats, and strategies for the Amumu vs Jax matchup.
Amumu Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Amumu 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 Amumu vs Jax?
Amumu wins 52.4% of these games. With this many games the true rate is most likely between 37.7% and 66.6% (95% range).
- Expected
- 54.6% From both champions' overall Jungle win rates
- Matchup effect
- −2.2 pts Observed minus expected
- Sample
- 42 games Lane: Jungle
- vs patch 26.18
- — Not enough games on both patches
Lane: Jungle · Ranked Solo/Duo & Flex · North America server · All ranks · Patch 26.19 · Sep 24 – Sep 28
Key takeaways
- Current data slightly favors Amumu, but the sample is too limited for a strong conclusion: Amumu wins 52.4% of 42 games (95% range 37.7–66.6%).
- Both champions' overall Jungle win rates predict 54.6% for Amumu; the result is within the margin of error of that, so this matchup mostly reflects the two champions' general strength.
- Neither side reliably wins the lane: the average gold difference at 15 minutes is 8, within the margin of error (41 games).
- Amumu players pick the Q > E > W skill order far more often against Jax: under 0.5% of their other Jungle games, 9.5% 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 Amumu and Jax 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 Amumu'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.
Amumu vs Jax Laning Stats
At 15 minutes
Whole-game averages
Amumu vs Jax Win Rate by Game Length
Amumu's win rate against Jax 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: Amumu's results against Jax in short and long games are within the margin of error of each other.
Amumu vs Jax 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)EvenAmumu gold at 15: −8
- First itemEvenAmumu: 0.2 min · Jax: 0.2 min
- Games under 20 minInsufficient data
- 20–30 min gamesInsufficient data
- 30+ min gamesInsufficient data
What Amumu Changes Against Jax
Choices Amumu players make noticeably more or less often in this matchup than in their other Jungle games.
- Q > E > Wthe Q > E > W skill orderSkill priorityUsuallyunder 0.5%vs Jax9.5%+9.5 pts
Frozen HeartItemUsually7.7%vs Jax16.7%+9.0 pts
Spirit VisageItemUsually0.5%vs Jax7.1%+6.6 pts
Deep WardRuneUsually0.5%vs Jax4.8%+4.3 pts
Usually0.7%vs Jax4.8%+4.0 pts
Scorchclaw Pup + Stealth WardStarting itemsUsually1.1%vs Jax4.8%+3.6 pts
Best Amumu Build vs Jax
Usual Amumu build (Jungle)
70.0% win rate · 50 games
Against Jax
Not enough matchup-specific build data: only 6 of 29 Amumu games against Jax carried a complete build, which is too few to recommend an item path from. Use Amumu's standard build instead.
- Amumu usually completes Mosstomper Seedling first, at 0.2 min (median of 30 games).
- Jax usually completes Gustwalker Hatchling first, at 0.2 min (median of 22 games).
- Skill priority: E > Q > 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 Amumu Runes vs Jax
Usual Amumu runes (Jungle)
Conqueror
54.1% win rate · 1,798 games
Against Jax
Too few games for a matchup-specific rune page yet — use the usual page.
Plan your Amumu 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
Amumu matchup data for League of Legends patch 26.19. The table below shows Amumu'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 Amumu build, runes, laning stats, and early vs late game analysis for that specific matchup.
Other Amumu Matchups
Hardest for Amumu
Easiest for Amumu
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.
Amumu vs Jax FAQ - Patch 26.19
Who wins Amumu vs Jax?
Current data slightly favors Amumu, but the sample is too limited for a strong conclusion: Amumu wins 52.4% of 42 games (95% range 37.7–66.6%).
What is Amumu's win rate against Jax?
Amumu wins 52.4% of 42 Jungle games against Jax on patch 26.19 (95% range 37.7–66.6%). Based on both champions' overall Jungle win rates, 54.6% would be expected.
Does Amumu counter Jax?
Not clearly. Amumu wins 52.4% of 42 games against Jax, and the 95% range (37.7–66.6%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Amumu or Jax?
Neither side reliably wins the lane: the average gold difference at 15 minutes is 8, within the margin of error (41 games).
Does Amumu outscale Jax?
There are too few games of each length to tell yet.
When is Jax strongest against Amumu?
On current data there is no stage of the game where Jax is ahead of Amumu beyond the margin of error.
What should Amumu build against Jax?
There are not enough games for a matchup-specific core, so use Amumu's usual Jungle core: Abyssal Mask, Liandry's Torment, Frozen Heart. The biggest change against Jax: Frozen Heart (7.7% usually, 16.7% here).
What runes should Amumu use against Jax?
Use Amumu's usual Conqueror page (Precision + Domination); there are too few games for a matchup-specific page. The biggest change against Jax: Deep Ward (0.5% usually, 4.8% here).