Olaf Runes explained
There's one set of runes for Olaf on patch 14.9 that is the clear favorite for LoL players and pros alike. The best Olaf rune paths on the position 
Jungle are 
Precision as the primary path and 
Inspiration as the secondary path with a pick rate of 94%. Besides picking runes on Olaf you should learn how to play Olaf and if you are interested in pro matches take a look on how a pro builds Olaf. If you want to discuss 
Olaf then you should visit the champion subreddit.
Olaf runes from primary path
Precision improves attack and sustained damage on Olaf troughout the match. Most of high elo players – and our LoL pros in the the major regions – have agreed that 
Conqueror is the best keystone rune to run on Olaf. This keystone rune provides additional power in the later stages of a game. As soon as Conqueror is fully charged, Olaf deals additional damage and gains life steal. Other primary runes on Olaf are 
Triumph, 
Legend: Alacrity and 
Last Stand.
Triumph restores on Olaf a part of missing health and award bonus gold, if a champion is killed. Legend: Alacrity grants additional attack speed to Olaf. With Last Stand you deal more damage while you are at low health.
Olaf runes from secondary path
When it comes to your secondary path, most Olaf players prefer to go with Inspiration. Inspiration opens creative opportunities on Olaf troughout the match. On the Inspiration path, the best runes for Olaf are 
Magical Footwear and 
Approach Velocity.
Magical Footwear allows Olaf to focus on those essential core items without the need to spend the additional 300 gold on boots. Olaf gains bonus movement speed by Approach Velocity, while moving toward enemy champions that are immobilized or slowed. This rune is perfect to follow up engages by your teammates.
FAQ for Olaf Runes
Which is the best keystone rune on Olaf?
The best keystone rune on Olaf is Conqueror. This Olaf runes setup is then referred as Olaf Conqueror.
What runes does Olaf use?
Runes from the paths Precision and Inspiration are the most used runes on Olaf. For the exact pick rates of Olaf runes used, you have to study the rune distribution presented.