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Centering tolerance
by grade
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How to read a centering percentage
Once you have a centering score, here's a general way to read it — a card with equal borders on both sides scores near 100%, and the score drops as the borders become more uneven:
- 90–100%: Excellent centering
- 75–89%: Good centering
- 60–74%: Fair centering
- Below 60%: Poor centering
This is a general guide, not an official standard from any single grading company — each grader weighs centering against corners, edges, and surface differently. See our how it works page for the full math behind the score.