Centering is the ratio of border width between opposite sides of a trading card’s printed frame. A perfectly centered card has equal border on left and right (50/50) and equal border on top and bottom (also 50/50). A 60/40 card has 60% of the total border width on one side, 40% on the other.
The print process is mechanically imperfect — sheets are printed, then cut into individual cards. Even minor cutting drift produces visible off-center cards, which is why a true 50/50 is genuinely rare straight from the pack.
How graders measure it
Every major grader measures the same way: distance from the printed border edge to the card edge, on each of the four sides. The worst axis (left/right or top/bottom) determines the centering grade.
For a standard 63×88mm Pokemon card with ~3mm borders, a 55/45 measurement means one side has 1.65mm of border and the other has 1.35mm — a 0.3mm difference. Visible if you know to look, subtle enough that buyers often miss it without a tool.
The grade cap
Centering is the only one of the four attributes (corners, edges, surface, centering) that’s purely binary against a published threshold. A card with perfect corners, edges, and surface gets capped at a lower grade if centering is past the threshold for the next tier up.
The grade caps for PSA, the most-used grader:
- Past 55/45 → max PSA 9
- Past 60/40 → max PSA 8
- Past 65/35 → max PSA 7
- Past 70/30 → max PSA 6
So a perfectly preserved card with 65/35 centering is a PSA 7, not a PSA 9 or 10 — even if it’s pulled straight from a sealed pack.
Why measure instead of eyeball
Centering is the hardest attribute to estimate by eye. The human visual system is built to make objects look more symmetric than they are — a 56/44 card looks centered unless you put a ruler on it. By the time a card looks obviously off, you’re usually past 60/40.
That’s why this tool exists: to put the actual measurement in your hand before you commit a $25 grading fee to a card that’s going to come back capped.