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! scope=row style="font-size:larger;" | Omicron<br>Xi<br>Nu<br>Mu<br>Lambda<br>Kappa

| Unconscious and minor level of psionic brain activity, of which the individuals and their surroundings are often unaware unless put to examination. Although these classes are technically by law under the jurisdiction of the [[Inquisition]], it is logistically unfeasible to examine every suspicion of them in the wider galaxy.{{Fn|1}} An example psyker of this grade is [[Mortanna Shroud]], who is a Lambda.{{Fn|16}}

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! scope=row style="font-size:larger;" | Iota<br>Theta<br>Eta

| As the individual is able to control abilities with effort, subjects of '''Iota''' level and higher are true [[psykers]] and upon discovery are usually immediately put under the care of the [[Inquisition]]{{Fn|1}} and the [[League of Black Ships]],{{Fn|6a}} unless they have a legal excuse not to be, such as having already been recruited into a [[Space Marine]] chapter as an [[acolytum (Librarian)|acolytum]].{{Fn|SM}}

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! scope=row style="font-size:larger;" | Zeta<br>Epsilon

| Very high level of mental psychic activity.{{Fn|1}} An example psyker of this grade is [[Calumny Faal]], who is a Zeta. But their powers are growing through practice, prompting the need for reclassification.{{Fn|11}}

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! scope=row style="font-size:larger;" | Delta<br>Gamma<br>Beta<br>Alpha

| Occurring in approximately one-per-billion human births.{{Fn|1}} Example psykers of this grade include [[Gregor Eisenhorn]] and [[Gideon Ravenor]]{{Fn|Ravenor}}, both of whom were high Delta or low Gamma (and not necessarily the same grade as each other). [[Agun Soric]] was Beta grade, and [[Esarhaddon]] was an Alpha.

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! scope=row style="font-size:larger;" | Alpha Plus

| First of and numerically almost synonymous with "plus" scale, still occurring the rarest in relation to all previous cases. Their state of mind always comes with a perceivable level of dementation or insanity.{{Fn|1}} Examples of this grade include the [[rogue psykers]] known as the [[Apex Twins]],{{Fn|14}} as well as the [[Burning Princess]].{{Fn|15}}

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! scope=row style="font-size:larger;" | Beta Plus

| Assumed to be the highest a human brain can withstand and be in possession of a fading semblance of sanity.{{Fn|1}}

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! scope=row style="font-size:larger;" | Gamma Plus

| The highest registered psionic human level to date. It is more widely achievable by some unspecified alien species and daemons, but not even they are known to exceed this rank.{{Fn|1}}

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! scope=row style="font-size:larger;" | Delta Plus<br>Epsilon Plus

| Never measured classifications, remaining only theoretical.{{Fn|1}}

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! scope=row style="font-size:larger;" | Zeta Plus

| Considered the highest living tissue can sustain.{{Fn|1}}

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| Levels considered requiring a being's mind to rely on non-corporeal structures for the being to survive.{{Fn|1}}

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