When you submit a card to PSA, you are praying for a 10. We all are. But many collectors reject their own cards before shipping because they "look off-center." They are leaving money on the table. PSA's official standard for a Gem Mint 10 is not 50/50—it is approximately 60/40.
1. The Official Standards Breakdown
According to PSA's official grading standards, here is what is allowed for centering on the FRONT of the card:
| Grade | Label | Front Centering | Back Centering |
|---|---|---|---|
| PSA 10 | Gem Mint | 60/40 | 75/25 |
| PSA 9 | Mint | 65/35 | 90/10 |
| PSA 8 | NM-MT | 70/30 | 90/10 |
*Note: These are ranges. A card with 58/42 centering is well within PSA 10 parameters.
2. Visualizing 60/40
What does 60/40 actually look like? It means one border is 1.5x wider than the other. To the naked eye, this is noticeable!
This slight asymmetry is acceptable for a Gem Mint 10.
The "Eye Appeal" Exception
While the technical limit is 60/40, a card that is 60/40 top-to-bottom AND 60/40 left-to-right might get knocked to a 9 because it looks "sloppy." PSA graders factor in overall eye appeal. If a card is perfectly centered left-to-right (50/50) but slightly off top-to-bottom (60/40), it almost always gets the 10.
3. How to Measure Before You Sub
Don't guess. Use tools.
1. Physical Card Grading Tool
Clear plastic overlays ($10 on Amazon) that you place over the card to read the ratio.
2. Digital Analysis (PreGradeCards)
Upload a scan to our AI tool. We count the pixels and give you the exact ratio instantly.
Try it free →