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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
Back borders (optional — needed to confirm a PSA 10)
Centering supports up to
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Horizontal (L/R)
—
Vertical (T/B)
—
Worst front axis
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Back (worst axis)
not entered
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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) — but a badly off-center back still rules out a Gem Mint grade even when the front is perfect. Enter the back borders above and the tool will flag it if the back, not the front, is what's capping the card.

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.
Do I need to measure the back too?
For a real PSA 10 estimate, yes. Front centering of 55/45 or better only clears half the bar — PSA also wants the back around 75/25 or better. A card with great front centering and a badly off-center back does not support a Gem Mint grade. Enter the back borders (optional) and the tool will flag it if the back is the limiting factor.