Pro tool
Card centering calculator
Upload a photo of the back: the ruler finds the edges, you nudge the lines if they are off, and you see which grade the centering still allows at PSA, BGS and SGC. No model, no estimate — geometry. The photo never leaves your device.
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Upgrade to ProHow centering is calculated
Centering is a ratio between two opposite borders. If the left border measures 3 mm and the right one 2 mm, the total is 5 mm: the left is 3/5 (60%) and the right 2/5 (40%) — 60/40. It is measured on both axes, left/right and top/bottom, and on both faces.
The worse axis is the one that counts: a card that is 50/50 horizontally and 65/35 vertically is a 65/35 card. Every grader is looser on the back than on the front, and this tool measures the back automatically — fronts often have no printed frame at all (borderless), and there you place the lines yourself.
What centering a 10 needs
The largest share of the wider side each grader allows for each grade. These are the same thresholds the calculator above applies.
| Grader | 10 | 9 | 8 | 7 |
|---|---|---|---|---|
| PSA | 75/25 | 90/10 | — | — |
| BGS | 50/50 | 70/30 | 80/20 | 90/10 |
| SGC | 55/45 | 60/40 | 65/35 | 70/30 |
| Grader | 10 | 9 | 8 | 7 |
|---|---|---|---|---|
| PSA | 55/45 | 60/40 | 65/35 | 70/30 |
| BGS | 50/50 | 55/45 | 60/40 | 65/35 |
| SGC | 55/45 | 60/40 | 65/35 | 70/30 |
PSA’s 55/45 front figure is the 2025 standard, not the older 60/40. BGS’s 10 is its Pristine grade (its Gem Mint is 9.5), as is SGC’s 10. An empty cell means centering alone excludes nothing at that grade: the other axes decide.