The Short Answer
- Centering is 25% of the PSA grade — one of the "Four Pillars" alongside corners, edges, and surface.
- PSA 10 requires 60/40 or better — borders must be within 10% of perfectly centered.
- PSA 9 allows 65/35 — minor off-centering acceptable if other pillars are strong.
- Measure with calipers — Eyeballing is not accurate enough. Use digital calipers for precise mm measurements.
- Front centering matters more than back — PSA weights front borders more heavily in grading decisions.
How Does Centering Affect Card Grade?
PSA 9 = 65/35 max | PSA 8 = 70/30 max
Centering is one of PSA's "Four Pillars" of grading — alongside corners, edges, and surface. A card with perfect corners and pristine surface but 70/30 centering will max out at PSA 8, regardless of everything else. Understanding centering standards is essential for predicting grades and deciding which cards are worth submitting. This guide provides precise measurement techniques, visual examples, and the exact ratios PSA graders use.
PSA Centering Standards by Grade
| PSA Grade | Centering Ratio | Percentage | Visual Description |
|---|---|---|---|
| Gem Mint 10 | 60/40 or better | ±10% max deviation | Borders appear nearly equal to the naked eye |
| Mint 9 | 65/35 or better | ±15% max deviation | Slight shift visible on close inspection |
| NM-MT 8 | 70/30 or better | ±20% max deviation | Noticeable off-centering, one border clearly wider |
| NM 7 | 75/25 or better | ±25% max deviation | Clearly off-center but not extreme |
| EX-MT 6 | 80/20 or better | ±30% max deviation | Off-centering is immediately obvious |
| EX 5 or lower | 85/15+ | ±35%+ deviation | Severe off-centering, image nearly touching border |
Important: These are approximate standards. PSA graders have some discretion — a card with 62/38 centering but perfect everything else might still earn PSA 10. Conversely, a card with 58/42 centering but borderline corners might drop to PSA 9. Centering is evaluated holistically alongside the other three pillars. Read our PSA methodology guide for the complete picture.
How to Measure Centering Precisely
Accurate centering measurement requires tools and technique. Here is the professional method:
Tools Needed
- Digital calipers ($15-25) — Most precise method, measures to 0.01mm
- Centering tool/card gauge ($5-10) — Pre-marked gauge for quick assessment
- Ruler with mm markings ($2) — Minimum viable option
- Good lighting — LED desk lamp eliminates shadows that distort perception
The Measurement Method
- Measure left border in millimeters (from card edge to printed image edge)
- Measure right border in millimeters
- Calculate ratio: Smaller measurement ÷ Larger measurement
- Example: Left = 3.2mm, Right = 2.8mm → 2.8 ÷ 3.2 = 0.875 → 87.5/12.5 ratio (excellent, PSA 10 range)
Border Measurement Points
Measure borders at three points — top, middle, and bottom — and average the results. Cards are not always uniformly off-center:
| Measurement Point | Where to Measure |
|---|---|
| Top | Top edge to top of printed image |
| Middle | Midpoint of card to midpoint of image |
| Bottom | Bottom edge to bottom of printed image |
Pro Tip: Some cards have design elements that make centering tricky. For example, 1986 Fleer basketball cards have a black border that can make the image edge hard to identify. In these cases, measure from the outer card edge to the inner edge of the border design — the point where the colored border meets the card face.
Visual Centering Examples
50/50 (Perfect Centering)
Borders are exactly equal. Rare in modern cards due to manufacturing tolerances. Most common in vintage cards from the 1950s-60s when cutting standards were different. Virtually guarantees PSA 10 if other pillars are flawless.
55/45 (PSA 10 Range)
Slight shift visible only under close inspection. One border is marginally wider. This is the most common ratio for PSA 10 cards. Still considered Gem Mint because the difference is minimal.
60/40 (PSA 10 Minimum / PSA 9 Typical)
Noticeable shift on inspection but not dramatic. One border is 50% wider than the other. This is the cutoff for PSA 10 — cards at 60/40 with perfect corners/edges/surface might get PSA 10, but many receive PSA 9.
65/35 (PSA 9 Maximum)
Clearly off-center. The wider border is nearly double the narrow border. Most cards with 65/35 centering max out at PSA 9 unless the other three pillars are exceptional and the grader exercises discretion.
70/30 (PSA 8 Maximum)
Significantly off-center. The image is clearly shifted to one side. Even with perfect corners, edges, and surface, a 70/30 card cannot exceed PSA 8. This is a common grade killer for otherwise beautiful cards.
Front vs Back Centering: Which Matters More?
PSA weights front centering more heavily than back centering in most cases. Here is why:
- Front is the display side — The side buyers see first and most often
- Back centering is more forgiving — Slightly worse back centering might not drop the grade if front is strong
- Exception: Some card backs are the main appeal (error cards, stats-heavy designs)
Front vs Back Grade Impact
| Front Centering | Back Centering | Likely Grade |
|---|---|---|
| 55/45 (excellent) | 65/35 (moderate) | PSA 9-10 |
| 60/40 (borderline) | 70/30 (poor) | PSA 8-9 |
| 65/35 (moderate) | 55/45 (excellent) | PSA 8-9 |
| 70/30 (poor) | 70/30 (poor) | PSA 7-8 |
Rule of Thumb: If front centering is good (60/40 or better), back centering can be slightly worse without major grade impact. If front centering is borderline (65/35), back centering must be strong to avoid a downgrade.
BGS Centering Standards (For Comparison)
BGS (Beckett Grading Services) uses a different centering scale than PSA, with sub-grades that make centering more transparent:
| BGS Sub-Grade | Centering Ratio | Notes |
|---|---|---|
| 10 (Pristine) | 50/50 to 55/45 | Near-perfect centering required |
| 9.5 (Gem Mint) | 55/45 to 60/40 | Equivalent to PSA 10 range |
| 9 (Mint) | 60/40 to 65/35 | Equivalent to PSA 9 range |
| 8.5 (NM-MT+) | 65/35 to 70/30 | Equivalent to PSA 8 range |
| 8 (NM-MT) | 70/30 to 75/25 | Equivalent to PSA 7-8 range |
BGS Advantage: BGS provides explicit centering sub-grades (e.g., BGS 9 with 8.5 centering), making it clear why a card received its grade. PSA does not publish sub-grades, leaving collectors to guess which pillar caused a downgrade. Read our PSA vs BGS comparison for more differences.
Can Centering Be Improved?
Unfortunately, centering cannot be improved after printing. It is a factory-determined characteristic. However, there are strategies to work with off-center cards:
What You CAN Do
- Choose the right grader — BGS is sometimes more forgiving on centering for modern cards. SGC also has slightly different centering tolerances.
- Submit to the right tier — High-value off-center cards might benefit from Walkthrough tier where senior graders exercise more discretion.
- Contextualize in submission — If the set is known for poor centering (e.g., 1989 Upper Deck, 1993 Topps), graders may be more lenient.
What You CANNOT Do
- Trim cards — This is card doctoring and will result in "Altered" designation or rejection
- Press cards — Does not affect centering, only surface flatness
- Magnetic holders — Do not improve centering, only protection
Sets Known for Centering Issues
Some card sets are notoriously off-center due to factory cutting practices. Collectors (and graders) know this and may adjust expectations:
| Set | Centering Reputation |
|---|---|
| 1989 Upper Deck Baseball | Notoriously off-center; PSA 10 extremely rare |
| 1993 Topps Baseball | Poor centering across the set |
| 1970s Topps sets | Inconsistent cutting; centering varies wildly |
| 2019-2020 Prizm Basketball | Modern set with centering quality control issues |
Bottom Line: Centering is a factory characteristic you cannot change. Your best strategy is to (1) measure accurately before buying, (2) pre-screen cards with AI to predict grades, and (3) only submit cards with 60/40 or better centering for PSA 10 candidates. Cards with 70/30+ centering should be evaluated as PSA 8 prospects — worth submitting only if the card's PSA 8 value exceeds $150. Ready to prepare cards? Read our pre-submission guide.
Frequently Asked Questions
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Sources & Further Reading
- PSA Grading Standards — Centering
- BGS Grading Sub-Grades
- Card Centering Measurement Tools
- PSA vs BGS Centering Comparison
With submission floors rising, pre-screening is no longer optional. Use our AI Pre-Grade Calculator to score a card's PSA 10 odds before you pay, and the Submission Planner to pick the right tier.