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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.

Centering looks good? → Run the grading ROI

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.

One caveat worth knowing before you act on the number above: chrome and refractor stock behaves differently from paper. The reflective surface shows print lines, scratches and roller marks that a paper base card hides, so a chrome parallel with textbook centering can still come back a 9. If the card you just measured is a Chrome, Bowman Chrome or Prizm parallel, read the parallels and refractors guide before you assume centering is the binding constraint.

Where to go next

Centering is a ceiling, not a verdict. Here's how to turn that ceiling into an actual decision.

Turn the ceiling into a number

Feed your realistic grade odds into the grading ROI calculator and see the expected profit and the break-even before you pay a submission fee.

Grading Acuña cards: when to submit

Which of his cards clear the bar for grading, how PSA, SGC and BGS differ in cost and resale premium, and how to prep a card for the trip.

PSA 10 vs raw on his cards

Where the gem-mint premium is genuinely worth chasing on Acuña cards — and where the 9 lands close enough to raw that the submission never pays.

The Acuña rookies people actually grade

His 2018 flagship, Chrome and Bowman Chrome rookies and the 2017 1st Bowman prospect cards — the ones where centering is worth measuring twice.

Why chrome grades differently

How refractor stock, print lines and surface texture change what graders penalise — the reason a perfectly centred chrome card can still miss the 10.

Log the cards that passed

Keep a running list of the cards worth submitting, with one-click eBay sold comps for each. Saved privately in your own browser, no signup.

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.