PSA Grading Scale Explained

PSA grades cards on a ten-point scale: PSA 10 is Gem Mint at the top and PSA 1 is Poor at the bottom. Between them sit eight whole grades with their own published labels, a set of half grades running from 1.5 to 8.5, and a handful of letter qualifiers that flag a specific defect rather than lowering the number.

The part worth internalising before anything else: there is no PSA 9.5. PSA adds a half point within each grade from 1.5 to 8.5 and then stops — a card goes directly from Mint 9 to Gem Mint 10. There is no intermediate step to soften the jump, which is exactly why that jump carries so much of a card's value.

A half grade is not the midpoint between two numbers. PSA's own explanation is that a half point is awarded to a card sitting at the high end of its whole grade — an 8.5 is an exceptional 8, not a near-9. It is a recognition of quality within a grade rather than a new rung on the ladder.

Two consequences follow. First, half grades run 1.5, 2.5, 3.5, 4.5, 5.5, 6.5, 7.5 and 8.5 — and there is no 9.5. Second, PSA states that a card carrying a condition qualifier is not eligible for a half point: a card must first reach unqualified status before a half grade is considered.

A qualifier is a two-letter suffix on the grade that names a specific defect. It says the card would have graded higher but for one isolated problem — so the number stays relatively high while the qualifier tells you why it is not clean.

Market treatment of qualifiers is harsh. A qualified card typically sells well below the same number unqualified, and often below the next grade down — buyers read the qualifier as the real condition statement. An OC qualifier in particular tends to be punished heavily, because centering is the defect collectors look at first.

Submitters can usually elect to decline qualifiers, in which case the defect is reflected in a lower whole number instead. Whether that is preferable is a market judgement rather than a condition one, and it is worth deciding before you submit rather than after.

Four things: centering, corners, edges and surface. A grade is a composite judgement across all four, and the weakest one tends to set the ceiling — a card with immaculate corners and a visible surface scratch is not getting a 10 on the strength of its corners.

1. Measure centering with an acrylic gauge, front and back. This is the defect most often responsible for a 9 instead of a 10, and the only one you can measure objectively at a desk.
2. Check all four corners under magnification, tilted into the light. Softness that is invisible flat is obvious at an angle.
3. Run the edges past a light source looking for chipping — chrome stock shows this far more readily than paper.
4. Tilt the surface under a single light source to catch scratches, print lines and gloss breaks that vanish under even lighting.
5. Be ruthless. Every card you screen out is a fee you keep, and submitting hopefully is the most expensive habit in this hobby.

Tools for that are in best card centering tools, and the economics of which cards clear the bar in what cards are worth grading and when to grade a card. For how the other companies' scales compare, see PSA vs SGC, PSA vs BGS and PSA vs CGC. The fees themselves are in PSA grading cost.