Grading Spec
PSA 10 Centering Requirements Explained
Centering is the fastest check you can run from a desk. Use it when a PSA 10 listing looks too cheap, or when you screen a raw copy before fees. PSA tightened the front rule in early 2025. If you still aim for old 60/40 front margins, expect more PSA 9 labels coming back.
6 min · Updated 2026-06-07
How to Read a Centering Ratio
A 55/45 front ratio means the wider border can take up at most 55% of the total border width on that axis (left/right or top/bottom). Measure from the card edge to the printed frame, compare both sides, and express the larger share first.
Example: left border 2.2 mm, right border 1.8 mm on the same axis. Total 4.0 mm. Wider side is 2.2 ÷ 4.0 = 55%. That axis passes PSA 10. Repeat for the perpendicular axis. Both axes must pass.
Borderless full-art Pokémon and modern sports photos need the same math on inner print elements when outer borders are absent. Use a reference PSA 10 scan if the frame is ambiguous.
Front vs Back Tolerance
PSA allows more slack on the back: 75/25 or better for Gem Mint 10. Factory backs are often worse than fronts. A card that looks perfect face-up can still gem if the reverse is slightly off but inside 75/25.
The front is the grade limiter in practice. Collectors rarely see a 65/35 front card gem because the back is perfect. Always photograph and measure both sides before paying grading fees or trusting a PSA 10 ask price.
What Changed in Early 2025
PSA moved Gem Mint front centering from 60/40 to 55/45 to align closer with SGC and stricter market expectations. The back rule stayed at 75/25. Cards that would have squeaked a 10 under the old front rule now land at PSA 9 if centering was the only flaw.
Cert numbers alone do not tell you which standard applied. For high-value submits or slab purchases, measure anyway. A 58/42 front today is a 9, not a "maybe 10".
When to Measure
Buying graded online: ask for flat, high-res front and back scans. Run them through a centering tool before you pay PSA 10 money on a borderline listing. Slab photos at an angle hide skew that drops a card to PSA 9.
Before you submit raw: use calipers or a centering tool with draggable guides on a flat scan. Phone photos at an angle distort ratios by several percentage points. That is enough to mis-grade a borderline card.
If either front axis reads worse than 55/45, decide whether the card still makes financial sense at PSA 9 before you rush a bulk submit or overpay for a slab. Surface and corners still matter, but centering is the fastest filter.
Our free Card Centering Calculator runs PSA, BGS, and SGC tables against your upload so you see pass/fail per grade tier without manual math.
Check your margins in minutes
Upload a scan or seller photo, align the guides, and compare front and back percentages to PSA 10, 9, and 8 thresholds.