Blue lines go on the card’s outer edges, pink lines on the inner edge of the printed border. Drag any line; a magnifier shows the spot under your finger.

Which side?

Shoot straight down on a flat, plain surface, with the card filling most of the frame. The photo stays on your device: nothing is uploaded.

Border widths on the front

Dragging fills these in. Or type them from a ruler or a loupe, in any one unit (mm, 64ths, pixels): only the ratio counts.

Front left/right 57.1/42.9, top/bottom 51.6/48.4

Back not measured

CompanyBest grade centering allowsTo the next grade
PSA9PSA 10 needs 55/45: 2.1 points off, left border wide.
BGS8BGS 9 needs 55/45: 2.1 points off, left border wide.
CGC9CGC 10 needs 55/45: 2.1 points off, left border wide.
SGC9SGC 10 needs 55/45: 2.1 points off, left border wide.

Centering is one part of a grade. Corners, edges and surface can only lower what this shows. Published centering limits, checked October 2026. Not affiliated with or endorsed by PSA, Beckett (BGS), CGC or SGC.

How the numbers work

Centering compares the two borders on each axis. A card with a 3.6 mm left border and a 2.7 mm right border is 57.1/42.9 left to right: the wider border’s share of the two. 50/50 is dead center. A card’s centering is its worse axis, so a card that is 57/43 one way and 52/48 the other counts as 57/43.

Each grading company publishes the worst centering it allows for each grade, like 55/45 on the front and 75/25 on the back for a PSA 10, or 50/50 all round for a Beckett Pristine 10. The table above holds the card against those limits and names the one it misses next and by how much. A company that sets no back limit for a grade is not held to one here.

The photo has to be straight on. A tilted phone makes the near border look wider than it is, and this page does not correct for that. Dead Center does: it finds the card’s corners and flattens the photo before it measures.

Let the phone find the borders

This is the measuring from Dead Center, our free app. The app finds the card’s edges and borders on its own, flattens a tilted photo so the angle can’t skew the numbers, gives each reading a ± for how sure it is, and sorts a stack of cards into a grading plan.

▶ Get it on Google Play

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