What PSA, BGS, CGC, SGC, TAG and ACE actually require for each grade, with the official centering tolerances, qualifiers and how the companies differ.
14 articles
PSA 10, BGS 9.5, CGC Gem Mint 10 and TAG 10 all sit at 55/45 on the front; backs and Pristine tiers differ. Measure your card and see which label it can reach.
How does PSA measure centering? What PSA officially says about comparing borders, the most off-center part, the 5% leeway and eye appeal, versus TAG and ACE.
ACE Grading centering standards: official per-grade tolerances, 1/1000 mm measurement, the OC modifier rule, three-border cards, and ACE vs PSA and TAG.
Graders don't average left/right and top/bottom centering — the worst axis sets the grade. Worked examples, PSA/BGS/TAG wording, and why T/B usually fails first.
SGC centering standards per grade (50/50 Pristine, 55/45 Gem, 60/40 for a 9) compared with PSA, plus what SGC does not publish about back centering.
PSA 10 allows about 55/45 front and 75/25 back; PSA 9 allows 60/40 and 90/10. The gap in millimeters, gem-rate data, and whether a 58/42 card is worth grading.
TAG centering tolerances for every grade: ~51/49 for Pristine 10, ~55/45 for Gem Mint 10, the sports vs TCG back split, the 1000-point score, how TAG measures.
Off-center and miscut are not the same. PSA's official OC and MC qualifier definitions, the 2021 policy change, the N8 no-grade, and how each affects value.
CGC centering standards explained: Pristine 10 is 50/50, Gem Mint 10 allows about 55/45 front and 75/25 back, Mint 9 is 60/40. Every grade, plus CGC vs PSA.
Is 60/40 centering a PSA 10? PSA's published Gem Mint standard is now 55/45 front and 75/25 back; 60/40 is the PSA 9 line. What that means for your card.
BGS centering standards per grade: 50/50 front and 55/45 back for a Black Label or Pristine 10, 55/45 for a 9.5, how subgrades set the grade, and BGS vs PSA.
Yes, back centering matters. Official back tolerances per grade for PSA (75/25), BGS (55/45), CGC and TAG, why backs are looser, and how to measure them.
PSA's official centering standards for every grade, PSA 10 to 1.5, front and back: 55/45, 75/25, the 5% leeway, OC qualifiers and what 58/42 really gets.
Every official card centering tolerance by grade in one table: PSA, BGS, CGC, SGC, TAG and ACE, front and back, verified August 2026, and how to read it.