How to Check Pokémon Card Centering for PSA 10

To check Pokémon card centering, measure the left and right borders and divide the smaller by the total, then do the same for top and bottom. PSA 10 allows roughly 55/45 on the front and 75/25 on the back. The fastest way to get the numbers is CardCureSG's free Pokémon card centering calculator: upload a straight-on photo, align four guides, and it reads out both ratios for front and back and tells you which PSA grade the centering supports.

Here is how the ratio works, what each grading company allows, how to measure by hand if you prefer, and the mistakes that make people think a card is a 10 when it is not.

How the centering ratio works

Centering is expressed as two numbers per axis. Left/right is left border ÷ (left + right) × 100. Top/bottom is the same with the top and bottom borders. A perfectly centered card reads 50/50 on both. A card whose left border is 2 mm and right border is 3 mm reads 40/60, which graders write as 60/40 regardless of which side is wider.

The front and back are measured separately, and the back is judged more loosely because the blue swirl border is wider and less noticeable when off.

What PSA allows

• PSA 10 Gem Mint: approximately 55/45 on the front, with 60/40 as the outer limit, and 75/25 on the back.
• PSA 9 Mint: 60/40 front, 90/10 back.
• PSA 8 NM-MT: 65/35 front, 90/10 back.
• PSA 7 NM: 70/30 front, 90/10 back.

Both axes must pass. A card at 52/48 left/right but 63/37 top/bottom caps at 9 no matter how clean the surface and corners are. PSA publishes these on its grading standards page.

What BGS and CGC allow

Beckett is stricter at the top. A BGS 10 Pristine needs 50/50 on both axes on the front, and a BGS 9.5 Gem Mint needs 50/50 on one axis and no worse than 55/45 on the other. CGC's Gem Mint 10 sits close to PSA's 10, around 55/45 front, and its Pristine 10 is close to Beckett's. If you are submitting to BGS or CGC, check their current published standards, they revise them more often than PSA does.

Checking with the calculator

1. Lay the card flat on a plain dark surface under even light with no glare. Sleeve off, or a clear penny sleeve at most.
2. Photograph it straight on with all four edges visible. A slightly angled shot skews the ratios, so retake rather than correct.
3. Open the centering calculator, upload the photo, and confirm the four corner points it suggests.
4. Straighten the card if needed, then place the outer guides on the physical card edges and the inner guides on the printed border.
5. Read the left/right and top/bottom ratios. Repeat for the back.
6. Copy the summary. It gives you both sides together and tells you the highest PSA grade the centering supports.

Everything runs in your browser and nothing is uploaded, so you can check a card you have not photographed publicly.

Checking by hand

If you would rather measure physically, use a steel ruler with 0.5 mm marks or, better, digital calipers. Measure each border at its midpoint, from the card edge to the printed frame, not to the artwork. Write the four numbers down and run the two formulas above. Expect a margin of error of about 0.2 mm per border with a ruler, which is enough to move a card from 55/45 to 57/43, so measure twice.

Mistakes that produce a false 10

• Measuring to the artwork instead of the border. Full art and illustration rare cards have no printed frame, so their centering is judged on the card's overall layout and is much harder to read. The calculator flags these as design-specific.
• Eyeballing. The difference between 55/45 and 60/40 on a standard card is under half a millimetre. Nobody sees that reliably.
• Checking the front only. Back centering fails cards more often than people expect, especially on Japanese prints.
• Measuring through a toploader. The card shifts inside the holder. Measure the card, not the holder.
• Trusting one photo. Angle and lens distortion change the numbers. Shoot twice and take the tighter reading as a warning, not the looser one.

Can centering be fixed?

No. Centering is set at the moment the card is cut at the factory, and nothing can change it afterwards. The only way to move the borders is trimming, which every grading company detects and flags as altered. If a card is off-center, that is the card. Cleaning and restoration can improve surface, edges and corners, which are the other three things graders score, but they cannot touch centering. That is why checking centering first, before you spend money on prep or grading fees, is the right order: if the centering caps a card at 8, a S$19 Deep Clean and a PSA fee will not get you a 10.

What to do with the result

If the centering supports a 10, the next question is whether the surface, corners and edges do. Send front and back photos to CardCureSG for a free assessment and we will tell you honestly whether the card is grading-ready as is, needs a Deep Clean, or has damage that is not worth treating. Our guide on whether it is safe to clean a card before PSA grading covers what prep is allowed.

If the centering caps the card at 9 or 8, it can still be worth grading for a keeper or for a vintage card where 9s carry real value. Just set the expectation before you submit.

CardCureSG is a Singapore-based Pokémon card cleaning and restoration service specialising in pre-grading prep for PSA, BGS and CGC, using non-invasive methods only.

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