How Do I Check Pokémon Card Centering Before Grading?
Short answer: Photograph or measure the card flat and straight on, compare the left border with the right and the top border with the bottom, and turn each pair into a ratio (the bigger border divided by the two added together). The worse of the two axes is your centering. PSA's published Gem Mint 10 standard is approximately 55/45 or better on the front and 75/25 on the back, and CGC's Gem Mint 10 uses the same figures, with 50/50 required for its Pristine 10. Check the back too, read the worst point along each edge, and remember that good centering only clears one hurdle: corners, edges, and surface still decide the grade. Educational only, not grading, pricing, appraisal, or investment advice. Portfolio does not buy, sell, grade, authenticate, appraise, or ship cards.
Why this question keeps coming up
Centering is the one part of a grade you can measure at home, so it's the first thing collectors check before paying to submit. r/PokeGrading's "For those asking about centering…" (February 2025) turned into a long argument about what PSA's standard actually is, after PSA's website wording moved to a 55/45 target for a 10. A month later, "How reliable is the card centering calculator app?" (March 2025) drew the app's own developer into the comments, and replies about leaving gaps when placing the lines. The same two questions keep returning: what number do I need, and how do I measure it without fooling myself?
What the centering numbers mean
Centering is written as two numbers that add up to 100, one pair per axis. To get it, measure the two opposite borders and divide the larger by their total. If the left border is 8.0 mm and the right is 6.0 mm, 8.0 ÷ 14.0 is about 57%, so the card is roughly 57/43 left to right. A perfectly centered card is 50/50 on both axes.
Standard | Front | Back |
PSA Gem Mint 10 | Approximately 55/45 or better | Approximately 75/25 or better |
CGC Gem Mint 10 | Approximately 55/45 or better | 75/25 or better |
CGC Pristine 10 | 50/50 | Not separately stated |
These figures come from PSA's and CGC's own published grading scales as of October 2026. Both are "approximately," and PSA's standards page adds that a grader may allow a small variance at their sole discretion based on the card's overall eye appeal. Treat 55/45 as the line, not as something you can push past.
The four rules that keep your reading honest
Judge by the worse axis. A card that's 52/48 left to right but 58/42 top to bottom is a 58/42 card for grading purposes.
Read the worst point, not the middle. If the print is slightly tilted, one border will be wider at one end. Measure two or three spots along each edge and keep the worst reading.
Measure the back. The back has its own allowance (75/25 for a 10 at PSA and CGC). It's looser, but badly off-center backs exist.
Measure to the same printed line on both sides. Pick one clear frame line, such as the yellow border's inner edge, and use it on all four sides. Full-art and borderless cards have no obvious frame, so centering is harder to read and you should treat any number as rough.
How to measure: phone app or ruler
With a phone app or web tool. Lay the card flat on a dark, plain background with no glare, hold the phone directly above it, and shoot the whole card with all four corners visible. Most centering tools straighten the photo and let you drag lines to the card's cut edge and to the printed frame. Zoom in and check that no lines sit in the wrong place: commenters in the r/PokeGrading app thread pointed out that a small gap between a line and the edge is enough to shift the result. A tilted phone or a curved card throws off the reading.
With a ruler or calipers. Use a clear ruler with fine markings and measure from the card's cut edge to the printed frame on each side, away from the rounded corners. Don't press the ruler down or slide it over the surface, and don't clamp metal calipers on a card you plan to grade. Borders on a standard card are only a few millimeters wide, so the gap between 55/45 and 60/40 is often a fraction of a millimeter. Record what your ruler can really read, not more.
What centering can't tell you
The grade. A perfectly centered card with a whitened back edge or a print line isn't a 10. Check condition next (see Is My Pokémon Card Near Mint or Lightly Played?).
Whether grading is worth it. That's a cost-versus-outcome decision covered in Should I Grade My Pokémon Cards?.
Which grader to use. PSA and CGC publish similar 10 thresholds, but other factors differ (see Should I Grade With PSA or CGC?).
What a slab's grade means for price. Grade plus supply is a separate question (see Does the PSA Pop Report Matter?).
What NOT to do
Eyeball it and call it fine. 55/45 looks more off-center than most people expect. Measure.
Check only one axis. Top to bottom fails cards as often as left to right.
Skip the back. It has its own limit.
Shoot at an angle or with glare. Perspective distorts the borders, and glare hides the frame line.
Trust an app's auto-placed lines without checking them. Zoom in and fix them by hand.
Assume a grader will round in your favor. The eye-appeal allowance is at the grader's discretion, and it can go the other way.
Handle the card more than you need to. Measuring shouldn't add a scratch or a dinged corner. Sleeve it again as soon as you're done.
HowTo: check centering before you submit
Prepare the card. Take it out of the sleeve with clean, dry hands and lay it flat on a dark, plain, non-scratch surface.
Photograph the front straight on. Hold the phone directly above the card, avoid glare, and keep all four corners and edges in frame.
Mark the cut edge and the printed frame. In a centering tool, place lines on the card's outer edge and on the same frame line on all four sides, then zoom in to check them.
Read left/right and top/bottom. For each pair, divide the larger border by the two borders added together.
Check the worst point. If the print looks tilted, measure near both ends of each edge and keep the worse number.
Repeat for the back. Flip the card and measure the back the same way.
Compare with the standard. Use the worse axis on each side against about 55/45 front and 75/25 back for a PSA or CGC 10.
Log it. Save the photos, both ratios, the date, and your condition notes on your record for that card before deciding whether to submit.
Soft CTA: keep the measurement with the card
A centering check is only useful if you can find it again when you're filling out a submission. Tools like Portfolio by Portfolio AI Corp, with Port as your in-app AI teammate, keep front and back photos, centering ratios, condition notes, and cost basis on one inventory row, so your "grade it or not" list is built from evidence. Think of it as the Carfax for personal assets, and a command center for what you own. Portfolio doesn't grade cards or predict grades. It keeps your research with the card.
Bottom line
Measure both axes on both sides, keep the worst reading, and compare it with about 55/45 front and 75/25 back if you're hoping for a PSA or CGC 10. Centering is the easiest part of a grade to check at home, so check it before you pay to submit, then look hard at corners, edges, and surface.
FAQ
What centering do I need for a PSA 10?
PSA's published standard for a Gem Mint 10 is approximately 55/45 or better on the front and 75/25 or better on the back. PSA notes that a grader may allow a small variance at their discretion based on eye appeal, but you shouldn't count on it.
Did PSA change its centering standard from 60/40 to 55/45?
PSA updated the wording on its website to name 55/45 as the target for a 10. In replies collectors shared in early 2025, PSA described this as clarifying how it already graded, with a small variance still possible at the grader's discretion.
What centering does CGC require for a 10?
CGC's Gem Mint 10 allows front centering not to exceed approximately 55/45 and back centering not to exceed 75/25. Its higher Pristine 10 requires 50/50 centering along with flawless color and registration.
How do I calculate a centering ratio?
Measure the two opposite borders, divide the larger one by the two added together, and write the result as a pair adding up to 100. An 8.0 mm left border and a 6.0 mm right border give about 57/43.
Does back centering matter?
Yes. PSA and CGC both set a separate limit for the back, 75/25 for a 10. It's looser than the front, but a badly off-center back can still hold a card back.
Are centering apps accurate?
They can be close when the photo is flat, straight on, glare-free, and the lines sit exactly on the card's edge and the printed frame. Check the placed lines yourself, since a small gap can shift the ratio.
Can a perfectly centered card still miss a 10?
Yes. Centering is one factor. Corners, edges, surface scratches, print lines, and back whitening all count, so a 50/50 card with wear won't grade a 10.
How do I check centering on a full-art card?
Full-art and borderless cards have no clear printed frame, so pick a consistent design line if there is one and treat the result as approximate. Graders judge these cards on eye appeal as well as measurement.
Does Portfolio grade cards or predict grades?
No. Portfolio is a photo-based asset registry and command center for what you own. It helps you keep card photos, centering notes, condition notes, and cost basis in one place. Portfolio AI Corp does not buy, sell, grade, authenticate, appraise, or ship cards.
Related guides
Should I Grade My Pokémon Cards?: deciding whether a submission is worth the fee
Should I Grade With PSA or CGC?: picking the grader once a card passes your checks
Is My Pokémon Card Near Mint or Lightly Played?: the corners, edges, and surface check that comes next
How Should I Photograph Pokémon Cards for Inventory?: getting flat, glare-free shots that measure well
Portfolio is the iOS net worth app from Portfolio AI Corp. It keeps cards, slabs, and the rest of what you own in one verified asset registry, with Port, its AI assistant, built in.
Disclaimer: Educational only, not grading, pricing, appraisal, or investment advice. Centering standards reflect PSA's and CGC's published grading scales as of October 2026 and may change; graders apply their own judgment. Collector discussion described reflects threads as of October 2026. Portfolio AI Corp does not buy, sell, grade, authenticate, appraise, or ship cards.
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