Average Chakra levels-
Genin- X units
Chunin- 10 X units
Jounin- 100X units
Elite Jounin- ??
Kage- ??
Nin arts proficiency level-
Level 1- Novice(Beginner)
Level 2- Intermediate(Can use that skill to such level that the application of the skill is useful in Genin level battles.)
Level 3- Advanced(Same as above but for Chunin level battles)
Level 4- Expert (Same as above but for Jounin level battles)
Level 5- Master ( Same as above but for Elite Jounin level Battles
Level 6- Grandmaster (Same as above but for Kage(or S rank) level battles
Analogous example for above using Chakra Control as an example:
Level 1- learning Leaf sticking with different amounts of mass of an object, multitasking at different chakra points, having basic understanding of internal chakra Control
Level 2- Water Walking(External Chakra Control) OR degree of Chakra Enhancement dangerous for Genins
Level 3- degree of Chakra Enhancement dangerous for Chunins OR Messing up other individuals' internal organs by sending your chakra to the opponent
Level 4- degree of .... for Jounins OR Shape Manipulation(Rasengan)(External Chakra Control)
Level 5- degree of ... Elite Jounin OR Mitotic Regeneration