Jax benefits greatly from items that have both Ability Power and Attack Damage such as Guinsoo's Rageblade and Hextech Gunblade.
Jax can Leap Strike to friendly units, including wards. You can use them to plan your escape.
Jayce is strong in the early game. If he gains the advantage, play defensively.
Jayce can attack in melee or at range. Pay attention to his stance and weapon color to know how he is going to attack.
If you see Jayce drop his Acceleration Gate, be careful, he is probably about to cast Shock Blast.
The stats provided here emphasize several important Jax vs. Jayce counter statistics that can help us realize the distinctions between the two. As an example, Jax’s KDA ratio ([kills + assists] / deaths) of NaN is more than Jayce’s KDA ratio of NaN, indicating that Jax may be more central to his team's team fighting capability than Jayce..
Jax often has a similar longest kill spree as his foe does. Typically, he takes more damage than Jayce. This commonly reflects differing health capacities, yet it can also show that the one champ has less mobility and thus is not able to escape additional damage when poked or engaged.
Both League champions are great. Both have their strengths, weaknesses, and counters. In the game's current meta, Jax usually wins when trying to fight Jayce, with a 52.4% win rate. As a result, Jax makes a good counter for Jayce.
While Jax does have a higher win rate than Jayce, when facing one another, Jax also has a lower difficulty level that makes him a less time consuming champ to develop with. You should be be fine when picking Jax into Jayce.
Furthermore, Jax has some amount of utility and CC, a similar amount to Jayce. This makes her just as valuable during teamfights, especially when fighting champions with a lot of burst damage.
While there is not one best champion in League of Legends, in Jax vs Jayce matchups, Jax is the better champ with a noticably higher win rate, less champion complexity, and a similar amount of utility to help out your allies during late stage team fights.
Jax is an above average counter for Jayce. You will do well by focussing your gameplay on maximizing your gold and cs and taking out objectives. If you do that, you should hold your own as Jax against Jayce.
If you would like to learn all of the intricacies of Jax to counter Jayce during both the early game and mid / late game phases of League of Legends, you should keep reading to learn a few extra tips and tricks for this matchup. If you listen to the build and stats shown above, you should increase your win rate significantly and be that much closer to League of Legends pro players.
Jax most often gets less CS relative to Jayce. Champions who typically don't take many minion kills usualy don't have to have much CS to be valuable teammates, such as supports. They are capable of scaling properly off of their abilities and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, typically need several high cost items to be effective. In either case, try to do better than the values reported on this page to do well.
The most crucial items to focus on in your Jax versus Jayce build consist of Sterak's Gage, Spear of Shojin, and Sundered Sky. When Jax included at least these three items in his build, he performed much better against Jayce than with many other commonly used item sets. In fact, Jax boasted an average winrate of 52.4% battling Jayce with this build.
To have the best probability of coming out on top against Jayce as Jax, you should use the Lethal Tempo, Triumph, Legend: Alacrity, Last Stand, Cosmic Insight, and Magical Footwear runes from the Precision and Inspiration rune sets. Of all the rune builds players used for Jax vs Jayce LoL games, this set of runes yielded the greatest win rate. Moreover, these runes gave a 52.4% winrate overall.
By default, tips, statistics, and builds on how to beat Jayce as Jax are displayed for all skill levels combined. If you want to scope the stats and builds to a distinct skill level, you should use the selection menu located earlier in the counter matchup guide.