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Front and back measurements with current grading references.
Upload your card's front and back to auto-detect the borders, measure each centering ratio, and compare the result with published top-grade references from PSA, Beckett, CGC, and TAG. Fine-tune the measurements with a precision loupe and draggable lines. This is a pre-screening aid—not an official grade or a guarantee of a grading-company result.
Front and back in one guided pass, followed by adjustable border measurements and reference comparisons.
Upload the front of your card
Sleeve-free, on a solid background, shot straight-on
Upload the back of your card
Sleeve-free, on a solid background, shot straight-on
Current first-party references checked August 8, 2026. These figures help you pre-screen a card; they do not replace each company's full grading standard or physical review.
Approximately 55/45 on the front and 75/25 on the reverse. PSA also considers eye appeal, and its graders make the final decision from the physical card.
Official PSA grading standardsBeckett's current page lists 50/50 on the front and 55/45 or better on the back. Centering is one of four categories alongside corners, edges, and surface.
Official Beckett grading pageCGC lists 50/50 for Pristine 10. For Gem Mint 10, it lists approximately 55/45 on the front and 75/25 on the reverse.
Official CGC grading scaleTAG says that, generally, a bordered card measured outside 55/45 cannot receive a Gem Mint 10 centering result. This is a screening boundary; TAG determines the final result.
TAG grading help referenceBorder design, print registration, image quality, eye appeal, other condition categories, and the company's own inspection can all affect the result. Review our grading standards overview before choosing where to submit.
Follow these tips to ensure your photos produce the most accurate centering detection on both sides.
CGI Vision AI reviews visible centering, corner, edge, and surface condition from your photos and returns an estimated grade report for pre-screening.
Start gradingCentering refers to how evenly the card's image is positioned within its borders. Perfect centering would be 50/50 on both left/right and top/bottom, but this is rare in practice. Centering is measured on both the front and back. Our card centering-ratios guide shows how to read common ratios and account for difficult border designs.
A strong front measurement does not tell you how the reverse is centered. That is why this tool measures both sides and calls out the less-centered one. Published references also vary by side: PSA describes approximately 55/45 on the front and 75/25 on the reverse for Gem Mint 10, while Beckett's current Black Label reference lists 50/50 on the front and 55/45 or better on the back. Those numbers help with pre-screening, but the grader's full standard and physical inspection control the result.
A centering ratio like "60/40" means one border is 60% of the combined border width while the opposite border is 40%. For example, if the left border is 1.8mm and the right border is 1.2mm, the combined width is 3.0mm, making it 60/40 (1.8 / 3.0 = 0.60). The closer to 50/50, the better the centering. The worse of the two axes (left/right vs top/bottom) determines the centering score for that side.
PSA's current Gem Mint 10 description uses approximately 55/45 on the front and 75/25 on the reverse. Use those figures to decide whether a card deserves closer inspection, not to predict a guaranteed slab grade. PSA also considers eye appeal and other condition factors before assigning the final grade. See our PSA grades guide for a plain-language overview of the full scale, then review how the PSA grade predictor handles the other visible condition categories.
The companies do not publish one interchangeable definition of a 10. PSA describes Gem Mint 10 at approximately 55/45 front and 75/25 reverse. Beckett lists 50/50 front and 55/45 or better back for a Black Label. CGC lists 50/50 for Pristine 10, while its Gem Mint 10 reference is approximately 55/45 front and 75/25 reverse. TAG says that, generally, a bordered card outside 55/45 cannot receive Gem Mint 10 centering. Read the cited first-party sources above, because each company determines the final result.
This tool uses a Sobel edge detection algorithm to automatically find the card's outer edges and inner image borders, right in your browser. The image is converted to grayscale, blurred to reduce noise, then a gradient filter identifies strong edges. The detected borders are placed as draggable lines — use the precision loupe and arrow-key nudging to fine-tune them.
Centering can contribute to the difference between adjacent grades, and the market price may change with the assigned grade. The size of that difference depends on the exact card, scarcity, demand, and recent sales. Before submitting, use this centering calculator or our free AI grading tool as a pre-screen, then review edge and surface defects that centering alone cannot reveal. You can also check current market prices with our value calculator.
Explore more resources about card grading
How to measure and interpret front and back ratios
Choose edge, surface, value, PSA, and cert checks
What PSA grades mean and how the full scale works
Inspect the defects a centering ratio cannot show
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CGI Vision AI reviews visible centering, corner, edge, and surface condition from front and back photos, then returns an estimated grade report for pre-screening.