PSA Grading Explained: What the Numbers Mean
If you've looked at trading cards for more than five minutes, you've seen them: cards sealed in hard plastic cases with a number on the label. That's a graded card, and more often than not, the grader is PSA. Here's what PSA grading actually means — and why it matters when you buy.
What is PSA grading?
PSA stands for Professional Sports Authenticator, the largest third-party card grading company. You send in a card, PSA's graders evaluate its condition and authenticity, and they seal it in a tamper-evident holder — a “slab” — with a label listing the card, a grade, and a unique certification number.
The 1–10 scale
PSA grades on a 10-point scale. In broad terms: a PSA 10 (Gem Mint) is essentially flawless; a PSA 9 (Mint) has one minor imperfection; grades in the 7–8 range are clean, collectible cards with light wear; the middle grades show visible handling; and low grades down to PSA 1 (Poor) reflect heavy damage. The jump from a 9 to a 10 can be dramatic in a card's desirability, which is why grading is taken so seriously.
What graders actually look at
Four factors drive the grade: centering (how evenly the image sits within the borders), corners (sharp versus soft or dinged), edges (clean versus chipped), and surface (scratches, print lines, gloss). A single weak category can cap an otherwise perfect card.
What the slab and label tell you
The label isn't just decoration. The certification number ties the card to PSA's database — you can look it up to confirm the grade and details match the slab in your hands. That lookup is your protection against a tampered or counterfeit holder. For autographed cards, PSA's sister service PSA/DNA can also authenticate the signature itself.
Do you need a graded card?
Not always. Grading makes the most sense for cards where condition drives value, or where you want an independent, resale-ready grade. For many collectors, a raw (ungraded) card that's honestly described and authenticated is exactly what they want. The right answer depends on why you're buying — to hold, to display, or to resell.
How this connects to authentication
Grading and authentication overlap but aren't identical: grading rates condition, authentication confirms something is real. Both come back to the same principle we apply to every item we sell — verify before you trust. That's the Verified & Shipped standard, checked in-house in Portland, Oregon. If you're evaluating a signed card, start with how to tell if a sports autograph is real, and see how we verify authenticity across the board.
— Anthony from West Coast Deals