Olaf can combine Berserker Rage, Vicious Strikes, and Ragnarok at low life to become deceptively strong.
The bonus healing granted by Vicious Strikes amplifies your Life Steal from all sources as well as heals from allies.
Try to engage him in short bursts instead of going toe-to-toe with him. Preventing him from attacking consecutively drastically lowers his damage output.
Jax can dodge all incoming attacks for a very short amount of time and stuns enemies in melee range when it ends. Wait to strike him until after his dodge is finished.
The stat comparisons shown here feature some influential Olaf against Jax matchup stats that can help us figure out the distinctions between these two champs. Olaf’s KDA ratio ([kills + assists] / deaths) of NaN is more than Jax’s ratio of NaN, indicating that Olaf may be more central to his team's team fighting effectiveness than Jax..
Olaf often has a similar longest kill spree as his matchup does. On average, he takes a similar amount of damage to Jax. This typically indicates different amounts of tankyness; however, it can also illustrate that the champ with higher health has less mobility and thus is not able to flee from further harm when engaged or poked.
Both League champs are great champions. Both have their strengths, weaknesses, and counters. In League's current meta, Olaf usually loses when facing off against Jax, with a 48.2% win rate. Thus, Olaf makes a bad counter for Jax.
While Olaf does have a lower winrate than Jax, when on opposite teams, Olaf also has a lower learning curve that makes him a less challenging champion to pick up and master. You should be careful when picking Olaf into Jax.
Furthermore, Olaf also has almost no amount of CC and other utility, a similar amount to Jax. This often makes her just as valuable during teamfights, especially when trying to counter champions with a ton of burst damage.
While there isn't one best champion for every situation in League of Legends, in Olaf vs Jax matchups, Jax is the better champion with a lower win rate, less champion complexity, and a similar amount of utility to help out your teammates during late stage team fights.
Olaf is a somewhat poor counter for Jax. You will do well by focussing your actions on maximizing your gold and cs and taking out objectives. If you do that, you should do very well as Olaf against Jax.
If you would like to learn all of the intricacies of Olaf to counter Jax during both the lane and mid / late game phases of League of Legends, you should continue reading to gather a few extra lessons on this matchup. If you listen to the build and suggestions shown here, you will grow your win rate by a lot and be closer to League of Legends pro players.
Olaf often accumulates a similar amount of CS compared to Jax. Champions who on average don't earn many minion kills typically don't need much CS to be effective, such as support champions. These kinds of champions are able to scale well off of their skills, stats, and first items alone. Yet, champs with a lot of CS, such as hyper-carries, usually need several high cost items to be effective. In either case, try to exceed the values displayed here to do well.
The most important items to prioritize in your Olaf versus Jax build include Sterak's Gage, Ravenous Hydra, and Jak'Sho, The Protean. When Olaf bought at least these three items in his build, he did significantly better when fighting Jax than with most other typical item sets. In fact, Olaf had an average win rate of 48.2% when playing against Jax with this build.
To have the best chance of coming out on top against Jax as Olaf, you should use the Conqueror, Triumph, Legend: Alacrity, Last Stand, Approach Velocity, and Biscuit Delivery runes from the Precision and Inspiration rune sets. Out of all the rune combinations players used for Olaf vs Jax fights, this sequence of runes yielded the best win rate. In fact, these runes provided a 48.2% winrate overall.
By default, tips, stats, and builds on how to beat Jax as Olaf are shown for all ranked divisions combined. To filter the statistics and builds to a particular player tier, you can use the selection menu earlier in the counter matchup guide.