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Free Tool

Card Centering Tool

Centering is the first thing a grader measures. Enter your card’s border widths and see your exact front centering and the highest PSA grade it could support — before you spend a cent on grading.

Measure the borders in any unit (mm, or pixels from a straight scan) — just be consistent.

Horizontal borders
Vertical borders
Centering supports up to
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Horizontal (L/R)
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Vertical (T/B)
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Worst axis
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Centering only sets the ceiling — corners, edges and surface decide the rest. As an Amazon Associate and eBay Partner we may earn from qualifying purchases.

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Centering is a ceiling — corners, edges, and surface still decide the final grade.

PSA centering tolerances (front)

Centering sets the highest grade a card can reach. These are the widely-cited PSA front-centering thresholds:

  • PSA 10 (Gem Mint) — about 55/45 or better
  • PSA 9 (Mint) — about 60/40
  • PSA 8 (NM-MT) — about 65/35
  • PSA 7 (NM) — about 70/30

Backs are graded more leniently (a 10 generally allows ~75/25 on the back). This tool focuses on the front, where centering is judged most strictly.

How to measure accurately

  • Scan straight-on at high resolution, or use calipers on the physical card.
  • Measure to the same reference on each side — typically the edge of the printed image to the edge of the card.
  • Be consistent with units. Ratios are what matter, not the absolute numbers.

Frequently Asked Questions

How do I measure card centering?
Measure the white border on the left and right of the card’s image (horizontal), and the top and bottom borders (vertical). Use any unit — millimeters, or pixels from a straight-on scan — as long as you’re consistent. Enter all four and the tool converts them to a centering ratio like 55/45 and tells you the best PSA grade that centering allows.
What centering do you need for a PSA 10?
PSA’s Gem Mint 10 generally requires roughly 55/45 centering or better on the front (and about 75/25 or better on the back). PSA 9 allows about 60/40, PSA 8 about 65/35. Centering is only a ceiling, though — corners, edges, and surface still have to hold up for the card to actually hit that grade.
Does centering alone determine the grade?
No. Centering sets the maximum grade a card can earn, but corners, edges, and surface condition can pull it lower. A perfectly centered card with a soft corner won’t get a 10. Use this to rule cards out (bad centering caps the grade) and pair it with an honest look at the other three factors.