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.
Katarina's abilities deal magic damage, so even if she's building Attack Damage items, get magic resistance to counter her.
Try to save a disable for when Katarina uses her Death Lotus.
The stat comparisons shown here emphasize several critical Jax versus Katarina counter statistics that may help us figure out the distinctions between the two. As an example, Jax’s KDA ratio ([kills + assists] / deaths) of NaN is better than Katarina’s ratio of NaN, showing that Jax may be more central to his team's team fighting effectiveness than Katarina..
Jax often has a slightly smaller longest killing spree than his foe does. Typically, he takes more damage than Katarina. This typically indicates differing health capacities, yet it can also indicate that the champ with more HP has less agility and thus is not able to kite away from additional damage when poked or engaged.
Both LoL champs are great champions. Both champs have their pros and cons. In the game's current meta, Jax usually wins when playing against Katarina, with a 53.4% win rate. Thus, Jax makes a great counter to Katarina.
While Jax does have a higher winrate than Katarina, when on opposite teams, Jax also has a lower difficulty level that makes him a less complex champion to pick up and master. You should be be fine when picking Jax into Katarina.
Moreover, Jax has some amount of utility and CC, a similar amount to Katarina. This often makes her just as valuable during teamfights, especially when facing champions with a lot of burst damage.
While there isn't one best champion for every situation in League of Legends, in Jax vs Katarina 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 allied champions during team fights.
Jax is a great counter for Katarina. You will do well by focussing your actions on increasing your CS and clearing objectives. If you are able to do that, you should do very well as Jax against Katarina.
To truly master Jax to counter Katarina during both the lane and mid / late game phases of League of Legends, you should keep reading to pick up a few extra lessons on this matchup. If you pay attention to the build and suggestions shown here, you will grow your win rate significantly and be closer to League of Legends pro players.
Jax on average racks up a similar amount of CS relative to Katarina. Champs who typically don't earn many minion kills usualy don't require much CS to be valuable teammates, such as support champions. These kinds of champions are able to scale properly off of their skills, stats, and first items alone. Yet, champs with a lot of CS, such as hyper-carries, typically have to have many items to be effective. In either situation, try to surpass the numbers reported here to do well.
The most important items to focus on in your Jax versus Katarina build include Guardian Angel, Sterak's Gage, and Trinity Force. When Jax included at least these three items in his build, he performed significantly better when fighting Katarina than with many other common builds. In fact, Jax boasted an average win rate of 53.4% when countering Katarina with this build.
To have the best chance of crushing Katarina as Jax, Jax players should equip the Lethal Tempo, Triumph, Legend: Alacrity, Last Stand, Cosmic Insight, and Magical Footwear runes from the Precision and Inspiration rune sets. Of all the runes players chose for Jax vs Katarina counterpicks, this sequence of runes resulted in the highest win rate. In fact, these runes averaged a 53.4% winrate overall.
By default, tips, statistics, and builds on how to beat Katarina as Jax are presented for all skill levels, merged. To scope the statistics and builds to an individual rank, you should use the selection menu located above.