Card Centering Explained: How to Measure It and Why It Matters
How to measure trading card centering (55/45, 60/40), front and back tolerances for PSA 10, how centering affects grades and value, and quick at-home tools.
By Ayoub Farid · · 2 min read
Centering describes how evenly the printed design sits on the card, judged by comparing the borders on opposite sides. It's the one flaw you can't fix or avoid with careful handling, and it often decides whether a card can get a top grade.
How centering is expressed
Centering is written as a ratio of the two opposite borders, for example 55/45:
- 50/50 = perfectly centered
- 55/45 = slightly off
- 60/40 = noticeably off
- 70/30 and beyond = clearly off-center
It's measured left/right and top/bottom, on the front and back.
How to measure it
- Measure the left and right border widths (with a ruler, calipers or a centering tool).
- Divide each by the total of both and express as percentages.
Example: left border 2.2 mm, right border 1.8 mm → 2.2 / 4.0 = 55%, 1.8 / 4.0 = 45% → 55/45.
Repeat for top/bottom and for the back.
Grading tolerances (approximate)
Graders publish centering standards per grade. As a rule of thumb for a PSA 10, the front should be around 55/45 to 60/40 or better, and the back around 75/25 or better. Lower grades allow more. BGS and CGC have their own, often stricter, standards for their top grades.
Why it matters for value
- A card with perfect corners and surface but 65/35 centering usually can't reach a 10.
- Well-centered copies of popular cards sell for a premium, even raw.
- Some sets are known for poor centering, making well-centered copies scarcer.
Tools that help
- A small ruler or digital calipers
- Phone photos zoomed in, with a grid overlay
- Centering apps and templates
- A good lamp and a magnifier
Diamond cuts and tilt
Sometimes a card is cut at a slight angle ("diamond cut" or tilt), so borders are uneven at the top and bottom of the same side. Graders may treat this more harshly than simple off-centering.
Try it on your own cards
Rarefolio's AI condition estimate is a quick first look. For grading candidates, measure centering by hand using the method above. Then decide with is it worth grading cards?.
Frequently asked questions
What does 60/40 centering mean?
One border is 60% and the opposite border 40% of their combined width; the card is noticeably off-center.
What centering do you need for a PSA 10?
Roughly 55/45 to 60/40 or better on the front and about 75/25 or better on the back, per PSA's published standards.
Does centering affect raw card prices?
Yes, especially for valuable cards; well-centered copies often sell for more because they can grade higher.
Can centering be fixed?
No. Centering comes from printing and cutting; trimming a card to fix it is alteration and graders reject altered cards.