Jarvan IVvs Rammus
Jarvan IV vs Rammus 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 Jarvan IV build, runes, laning stats, and strategies for the Jarvan IV vs Rammus matchup.
Jarvan IV Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Jarvan IV 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 Jarvan IV vs Rammus?
Jarvan IV wins 51.3% of these games. With this many games the true rate is most likely between 36.2% and 66.1% (95% range).
- Expected
- 45.7% 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
- Jarvan IV vs Rammus is an even matchup: Jarvan IV wins 51.3% of 39 games, and the 95% range (36.2–66.1%) comfortably includes 50%.
- Both champions' overall Jungle win rates predict 45.7% for Jarvan IV; 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).
- Jarvan IV players pick Cut Down far more often against Rammus: 6.5% of their other Jungle games, 17.9% 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 Jarvan IV and Rammus 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 Jarvan IV'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.
Jarvan IV vs Rammus Laning Stats
At 15 minutes
Whole-game averages
Jarvan IV vs Rammus Win Rate by Game Length
Jarvan IV's win rate against Rammus 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: Jarvan IV's results against Rammus in short and long games are within the margin of error of each other.
Jarvan IV vs Rammus 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)EvenJarvan IV gold at 15: +269
- First itemInsufficient data
- Games under 20 minInsufficient data
- 20–30 min gamesInsufficient data
- 30+ min gamesInsufficient data
What Jarvan IV Changes Against Rammus
Choices Jarvan IV players make noticeably more or less often in this matchup than in their other Jungle games.
Cut DownRuneUsually6.5%vs Rammus17.9%+11.5 pts
Scorchclaw Pup + Health PotionStarting itemsUsually9.1%vs Rammus20.5%+11.4 pts
Adaptive Force (flex)Stat shardUsually98.3%vs Rammus92.3%−6.0 pts55.6% WR here
Usuallyunder 0.5%vs Rammus5.1%+5.1 pts
Health Scaling (flex)Stat shardUsually0.6%vs Rammus5.1%+4.5 pts
Best Jarvan IV Build vs Rammus
Usual Jarvan IV build (Jungle)
70.3% win rate · 74 games
Against Rammus
Not enough matchup-specific build data: only 2 of 24 Jarvan IV games against Rammus carried a complete build, which is too few to recommend an item path from. Use Jarvan IV'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 Jarvan IV Runes vs Rammus
Usual Jarvan IV runes (Jungle)
Conqueror
54.3% win rate · 361 games
Against Rammus
Too few games for a matchup-specific rune page yet — use the usual page.
Plan your Jarvan IV 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
Jarvan IV matchup data for League of Legends patch 26.19. The table below shows Jarvan IV'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 Jarvan IV build, runes, laning stats, and early vs late game analysis for that specific matchup.
Other Jarvan IV Matchups
Hardest for Jarvan IV
Easiest for Jarvan IV
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.
Jarvan IV vs Rammus FAQ - Patch 26.19
Who wins Jarvan IV vs Rammus?
Jarvan IV vs Rammus is an even matchup: Jarvan IV wins 51.3% of 39 games, and the 95% range (36.2–66.1%) comfortably includes 50%.
What is Jarvan IV's win rate against Rammus?
Jarvan IV wins 51.3% of 39 Jungle games against Rammus on patch 26.19 (95% range 36.2–66.1%). Based on both champions' overall Jungle win rates, 45.7% would be expected.
Does Jarvan IV counter Rammus?
Not clearly. Jarvan IV wins 51.3% of 39 games against Rammus, and the 95% range (36.2–66.1%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Jarvan IV or Rammus?
Neither side reliably wins the lane: the average gold difference at 15 minutes is 269, within the margin of error (38 games).
Does Jarvan IV outscale Rammus?
There are too few games of each length to tell yet.
When is Rammus strongest against Jarvan IV?
On current data there is no stage of the game where Rammus is ahead of Jarvan IV beyond the margin of error.
What should Jarvan IV build against Rammus?
There are not enough games for a matchup-specific core, so use Jarvan IV's usual Jungle core: Voltaic Cyclosword, Profane Hydra, Axiom Arc. The biggest change against Rammus: Scorchclaw Pup + Health Potion (9.1% usually, 20.5% here).
What runes should Jarvan IV use against Rammus?
Use Jarvan IV's usual Conqueror page (Precision + Inspiration); there are too few games for a matchup-specific page. The biggest change against Rammus: Cut Down (6.5% usually, 17.9% here).