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What centering does a PSA 10 need?
PSA 10 doesn't require perfect 50/50 centering. A card can be 55/45 on the front and 75/25 on the back and still qualify for Gem Mint, assuming corners, edges, and surface hold up too.
PSA's published centering tolerances
| PSA grade | Front | Back |
|---|---|---|
| PSA 10 · Gem Mint | 55/45 or better | 75/25 or better |
| PSA 9 · Mint | 60/40 or better | 90/10 or better |
| PSA 8 · NM-MT | 65/35 or better | 90/10 or better |
| PSA 7 · Near Mint | 70/30 or better | 90/10 or better |
| PSA 6 · EX-MT | 80/20 or better | 90/10 or better |
These are approximate, and graders also weigh overall eye appeal. Meeting the centering tolerance doesn't guarantee the grade. When we pre-screen Fox Den submissions, we look for 55/45 or better on the front, with 50/50 preferred.
Source: PSA Official Grading Standards
Centering calculator
Measure two opposite borders (left & right, or top & bottom) with a loupe or ruler and enter them below.
Measuring in millimeters
55/45 means one border can make up at most 55% of the combined width of the two opposite borders. So a card with a 5 mm border on one side and 4 mm on the other works out to 5 ÷ 9 = 55.6/44.4, just outside PSA 10's front tolerance.
Quick shortcut: for 55/45, the wider border can be at most 1.222× the narrower one. If one border is 4 mm, the other should be no wider than about 4.89 mm.
Loupe measurements carry a little error, so if you're submitting specifically for a 10, aim for 54/46 or better to give yourself some margin.
| Border A | Border B | Centering | PSA 10 front? |
|---|---|---|---|
| 4.50 mm | 4.50 mm | 50/50 | ✓ |
| 4.60 mm | 4.40 mm | 51.1/48.9 | ✓ |
| 4.70 mm | 4.30 mm | 52.2/47.8 | ✓ |
| 4.80 mm | 4.20 mm | 53.3/46.7 | ✓ |
| 4.90 mm | 4.10 mm | 54.4/45.6 | ✓ |
| 4.95 mm | 4.05 mm | 55/45 | Limit |
| 5.00 mm | 4.00 mm | 55.6/44.4 | ✗ |
| 5.10 mm | 3.90 mm | 56.7/43.3 | ✗ |
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