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.
Kai'Sa is very vulnerable to getting outranged by mages and long range carries.
Make sure to place wards in your blind spots so you can see Kai'Sa coming.
Kai'Sa is very good at picking off isolated enemies. Stick together against her.
The stats provided here emphasize several important Jax against Kai'Sa counter stats that may help us explain the distinctions between the two. Jax’s KDA ratio ([kills + assists] / deaths) of NaN is better than Kai'Sa’s ratio of NaN, demonstrating that Jax may be more central to his team's team fighting effectiveness than Kai'Sa..
Jax typically has a similar longest killing spree as his matchup does. On average, he takes more damage than Kai'Sa. This often reflects differing health capacities; however, it can also imply that the one champion has less mobility and thus is not able to flee from further harm when poked or engaged.
Both LoL champs are great. Both have their pros and cons. In League's current meta, Jax usually wins when playing against Kai'Sa, with a 54.9% win rate. Therefore, Jax makes a great counter to Kai'Sa.
While Jax does have a much higher winrate than Kai'Sa, when they face off with one another, Jax also has a lower level of difficulty that makes him a less challenging champion to develop with. You don't need to be too worried when picking Jax into Kai'Sa.
Additionally, Jax has some amount of CC and other utility, a similar amount to Kai'Sa. This makes her just as valuable during team fights, especially when facing champions with a ton of burst damage.
While there isn't one best champion in League of Legends, in Jax vs Kai'Sa matchups, Jax is the better champion with a noticably higher win rate, less champion complexity, and a similar amount of utility to help out your allies during team fights.
Jax is a great counter for Kai'Sa. Make sure you focus your gameplay on maximizing your gold and cs and taking out objectives. If you do that, you should be able to stand on your own as Jax against Kai'Sa.
If you would like to truly master Jax to counter Kai'Sa during both the early game and mid / late game phases of League of Legends, you should keep reading to pick up a few extra tips and tricks for this matchup. If you listen to the build and stats displayed above, you should grow your win rate by a lot and be closer to League of Legends pro players.
Jax on average racks up a similar amount of CS as Kai'Sa. Champs who on average don't take much CS usualy don't require much CS to be valuable teammates, such as sup champs. These kinds of champions are able to scale well off of their skills, stats, and first items alone. Yet, champions with a lot of CS, such as hyper-carries, often need several high cost items to be effective. In either case, try to surpass the numbers displayed on this page to do well.
The ideal items to focus on in your Jax versus Kai'Sa build include Guardian Angel, Sterak's Gage, and Trinity Force. When Jax combined at least these three items in his build, he did a lot better when facing Kai'Sa than with most other commonly used builds. In fact, Jax boasted an average winrate of 54.9% battling Kai'Sa with this counter build.
To have the best likelihood of defeating Kai'Sa as Jax, Jax players should use the Lethal Tempo, Triumph, Legend: Alacrity, Last Stand, Biscuit Delivery, and Cosmic Insight runes from the Precision and Inspiration rune sets. Of all the runes that we analyzed for Jax vs Kai'Sa counters, this blending of runes yielded the best win rate. Notably, these runes gave a 54.9% win rate overall.
If you would like to get Jax versus Kai'Sa tips and matchup stats and build suggestions for a a particular skill level, feel free to select one from the selection menu shown above. By default, the stats and guides shown are calculated using every match with data with both champions.