Grading
Pokémon Card Centering Calculator
Measure the four borders of a Pokémon card and get its left/right and top/bottom centering ratio, e.g. 55/45. Free, in your browser.
Result
Your result
- Left / right
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- Top / bottom
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- Most off-center axis
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Enter all four border widths in the same unit (mm or pixels).
How to use it
- Photograph the card straight on, or use a ruler or centering tool.
- Measure each border from the card edge to the art frame, in the same unit.
- Read the two ratios. Repeat for the back.
Ratio = larger border ÷ (both borders) × 100, written larger first. For example 2.2 mm and 1.8 mm give 55/45.
PSA’s published Gem Mint 10 standard is approximately 55/45 or better on the front and 75/25 on the back, and graders may use discretion. Centering is only one part of a grade.
Frequently asked questions
Questions about this tool
How do you calculate Pokémon card centering?
Measure two opposite borders, divide the larger one by their total and multiply by 100. A 2.2 mm and 1.8 mm pair is 55/45.
What centering does a PSA 10 need?
PSA’s grading standards say approximately 55/45 or better on the front and 75/25 on the reverse for Gem Mint 10, with some grader discretion for eye appeal.