Rammusvs Jarvan IV
Rammus vs Jarvan IV is a decisive matchup in LoL patch 26.19. Jarvan IV wins with a 56.3% win rate (+12.5%) over Rammus based on 16 games. Jarvan IV holds the advantage in both the early and late game. Below you'll find the best Rammus build, runes, laning stats, and strategies for the Rammus vs Jarvan IV matchup.
Rammus Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Rammus 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 Rammus vs Jarvan IV?
Rammus wins 48.7% of these games. With this many games the true rate is most likely between 33.9% and 63.8% (95% range).
- Expected
- 54.3% From both champions' overall Jungle win rates
- Matchup effect
- −5.6 pts Observed minus expected
- Sample
- 39 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
- Rammus vs Jarvan IV is an even matchup: Rammus wins 48.7% of 39 games, and the 95% range (33.9–63.8%) comfortably includes 50%.
- Both champions' overall Jungle win rates predict 54.3% for Rammus; 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 269, within the margin of error (38 games).
- Rammus players pick Thornmail much less often against Jarvan IV: 90.4% of their other Jungle games, 79.5% 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 Rammus and Jarvan IV 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 Rammus'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.
Rammus vs Jarvan IV Laning Stats
At 15 minutes
Whole-game averages
Rammus vs Jarvan IV Win Rate by Game Length
Rammus's win rate against Jarvan IV 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: Rammus's results against Jarvan IV in short and long games are within the margin of error of each other.
Rammus vs Jarvan IV 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)EvenRammus gold at 15: −269
- First itemInsufficient data
- Games under 20 minInsufficient data
- 20–30 min gamesInsufficient data
- 30+ min gamesInsufficient data
What Rammus Changes Against Jarvan IV
Choices Rammus players make noticeably more or less often in this matchup than in their other Jungle games.
Best Rammus Build vs Jarvan IV
Usual Rammus build (Jungle)
68.7% win rate · 83 games
Against Jarvan IV
Not enough matchup-specific build data: only 3 of 21 Rammus games against Jarvan IV carried a complete build, which is too few to recommend an item path from. Use Rammus's standard build instead.
- Jarvan IV usually completes Scorchclaw Pup first, at 0.2 min (median of 24 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 Rammus Runes vs Jarvan IV
Usual Rammus runes (Jungle)
Aftershock
53.7% win rate · 1,295 games
Against Jarvan IV
Too few games for a matchup-specific rune page yet — use the usual page.
Plan your Rammus 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
Rammus matchup data for League of Legends patch 26.19. The table below shows Rammus'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 Rammus build, runes, laning stats, and early vs late game analysis for that specific matchup.
Other Rammus Matchups
Hardest for Rammus
Easiest for Rammus
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.
Rammus vs Jarvan IV FAQ - Patch 26.19
Who wins Rammus vs Jarvan IV?
Rammus vs Jarvan IV is an even matchup: Rammus wins 48.7% of 39 games, and the 95% range (33.9–63.8%) comfortably includes 50%.
What is Rammus's win rate against Jarvan IV?
Rammus wins 48.7% of 39 Jungle games against Jarvan IV on patch 26.19 (95% range 33.9–63.8%). Based on both champions' overall Jungle win rates, 54.3% would be expected.
Does Rammus counter Jarvan IV?
Not clearly. Rammus wins 48.7% of 39 games against Jarvan IV, and the 95% range (33.9–63.8%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Rammus or Jarvan IV?
Neither side reliably wins the lane: the average gold difference at 15 minutes is 269, within the margin of error (38 games).
Does Rammus outscale Jarvan IV?
There are too few games of each length to tell yet.
When is Jarvan IV strongest against Rammus?
On current data there is no stage of the game where Jarvan IV is ahead of Rammus beyond the margin of error.
What should Rammus build against Jarvan IV?
There are not enough games for a matchup-specific core, so use Rammus's usual Jungle core: Jak'Sho, The Protean, Randuin's Omen, Thornmail. The biggest change against Jarvan IV: Thornmail (90.4% usually, 79.5% here).
What runes should Rammus use against Jarvan IV?
Use Rammus's usual Aftershock page (Resolve + Precision); there are too few games for a matchup-specific page. The biggest change against Jarvan IV: Demolish (1.2% usually, 5.1% here).