Card Centering Tool
Centering is the grading factor everyone argues about and almost nobody measures. Collectors eyeball it, disagree, and find out the truth only when the slab comes back. Guredo.AI helps you measure it: photograph the card, adjust the border guides until they match the frame exactly, and read off the ratios — the same numbers graders put on the scoresheet.
Why centering makes or breaks a grade
A card can have razor corners, clean edges and a flawless surface — and still be capped at a lower grade by centering alone. Top grades demand tight ratios, and the difference between an acceptable 55/45 and a grade-killing 65/35 is a fraction of a millimetre that the naked eye reads as “looks fine”.
That is exactly the kind of judgement that should be measured, not guessed.
Measure it from a photo
Photograph the card straight-on, then position the border guides over the card’s printed frame — you fine-tune them by hand, and the tool computes the ratios as you adjust, left/right and top/bottom, in the familiar percentages collectors and graders use. No ruler against the sleeve, no squinting at a loupe, no spreadsheet.
Know the thresholds before you pay
Every major grader publishes centering standards — roughly 55/45 to 60/40 on the front for the top grades at PSA, with looser tolerances on the back, and stricter cut-offs as grades climb at BGS and CGC. With your card’s actual numbers in hand, you can read those standards like a checklist: within tolerance, borderline, or save your money.
Standards shift and differ between graders, so always check the current published requirements for the service you’re targeting — the tool gives you the numbers to hold against them.
One piece of the full pre-grade
Centering is one of the four factors in every Guredo.AI condition report, next to corners, edges and surface. Use the centering tool when that is the specific question — a suspiciously shifted frame, a “miscut?” debate, a submission shortlist — and the full AI pre-grade when you want the whole picture.
Grader centering standards at a glance
The published tolerances for the top grades at each major service. Backs are generally allowed more leeway than fronts, and graders weigh overall eye appeal too — treat these as the checklist your measured ratios are read against.
| Company | Grade | Ratio |
|---|---|---|
| PSA | Gem Mint 10 | 55/45 front · 75/25 back |
| PSA | Mint 9 | 60/40 front · 90/10 back |
| PSA | NM-MT 8 | 65/35 front · 90/10 back |
| Beckett (BGS) | Pristine 10 | 50/50 front · 55/45 back |
| Beckett (BGS) | Gem Mint 9.5 | 50/50–55/45 front · 60/40 back |
| Beckett (BGS) | Mint 9 | 55/45 front · 70/30 back |
| CGC | Pristine 10 | 50/50 |
| CGC | Gem Mint 10 | 55/45 front · 75/25 back |
| CGC | Mint 9 | 60/40 front · 90/10 back |
| SGC | Pristine 10 | 50/50 |
| SGC | Gem Mint 10 | 55/45 or better |
| SGC | Mint 9 | 60/40 or better |
| TAG | Pristine 10 | ≈51/49 front |
| TAG | Gem Mint 10 | ≈55/45 front |
| TAG | Mint 9 | ≈60/40 front |
Approximate tolerances from each company’s published standards as of August 2026 (PSA, Beckett, CGC and SGC grading scales; TAG grading rubric). Standards change and graders allow small variances for eye appeal — always check the official pages before submitting.
Centering questions
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What centering do I need for a top grade?
It depends on the grader: as a rule of thumb, PSA’s top grades expect roughly 55/45 to 60/40 centering on the front with more tolerance on the back, and BGS and CGC apply their own cut-offs. Standards change, so check the grader’s current published requirements — the tool gives you your card’s actual numbers to compare against them.
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How accurate is a measurement from a photo?
Accurate enough to sort “comfortably within tolerance” from “borderline” — which is the decision that matters. A straight-on, well-lit photo gives the best result; a skewed angle distorts the ratios, so the app guides the capture. For a borderline card headed to a grader, treat the result as a strong estimate, not a certified measurement.
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Do I need any special equipment?
No — just your phone camera and decent light. Take the card out of any sleeve or slab so the true borders are visible.
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Can centering alone predict my grade?
No — centering can cap a grade, but corners, edges and surface decide the rest. That’s why the centering tool is part of the full AI pre-grade rather than a verdict on its own.
