Power Level

This is just a rudimentary classification of amount of chakra one posses. This not accurate and may vary according to individuals. After all Naruto had four times the amount of chakra than that of Kakashi who was a elite jonin himself and a top one at that. But Naruto was still a genin.

Naruto's chakra level after time skip was around S+ rank.

Most students from shinobi clans had chunin level chakra reserve.

A normal genin can perform a single C rank jutsu before facing chakra fatigue.

Civilian : 1

Students : 1 - 10

Genin : 10 - 100

Chunin : 100 - 1000

Special Jonin : 1000 - 3000

Jonin : 3000 - 6000

Elite Jonin : 6000 - 10000

S class : 10000 - 30000

S+ class : 30000 - 50000 : Itachi, Kisame, Orochimaru

SS class : 50000 - 100000 : Onoki, Hiruzen, 4th Raikage, 3rd Kazekage, 5th Mizukage,

SS+ class : 100000 - 250000 : Hashirama, Madara(EMS), Kyubi

SSS- class : 250000 - 550000 : Six Path Obito, Six Path Madara, Naruto(Kyubi + Six Path Sage Mode), Sasuke(Rinnegan)

SSS class : 550000 - 1000000 : Hagoromo Otsutsuki, Hamura Otsutsuki

SSS+ class : 1000000 - 2000000 : Ten Tails(full power)

SSS++ class : 2000000 - 5000000 : Isshiki Otsutsuki(1000 years before), Momoshiki Otsutsuki, Urashiki Otsutsuki, Kinshiki Otsutsuki

Demi God : 5000000 - 5000000000000 : Kaguya Otsutsuki(full power), Isshiki Otsutsuki(after absorbing chakra fruit)