Card Centering Guide: How to Measure + PSA Standards
Card centering can significantly increase the value of your trading cards — but only if you understand what graders are looking for.
What Is Card Centering?
Card centering refers to how evenly the printed image is aligned within the borders of the card. Grading companies like PSA use centering ratios to evaluate this, comparing the border widths on opposite sides of the card.
The PSA Grading Scale Explained
PSA grades cards from 1 to 10 based on four core factors:
- Centering — how balanced the borders are
- Corners — sharpness and wear
- Edges — chipping, whitening, or roughness
- Surface — scratches, print defects, and gloss
Centering is often the easiest factor to evaluate before submission — and the one MintySlab is built to measure precisely.
How to Calculate Card Centering
To calculate centering, you measure the borders and compare them. The basic formula is:
Centering Ratio
Ratio = Left ÷ (Left + Right)
Step by step:
- Measure the left and right borders
- Identify the smaller border
- Divide the smaller border by the total border width
Repeat for the top and bottom borders to get your full centering picture.
How to Increase Your Grade
Before submitting your card, you should:
- Inspect the card under good lighting
- Check for surface flaws and print defects
- Evaluate centering carefully on both axes
Tools That Help (Where MintySlab Wins)
Checking centering manually is difficult and inconsistent. Many collectors now use tools like MintySlab to scan cards, detect edges automatically, and calculate centering ratios instantly — which helps you make better submission decisions.
Why This Matters
The difference between a PSA 9 and a PSA 10 can be massive in value. By understanding grading factors and checking your cards beforehand, you can avoid wasted submissions, maximize value, and improve grading outcomes.
Final Thoughts
Card grading is part skill, part precision. Collectors who take the time to evaluate centering and condition before submitting consistently get better results.
Stop guessing — let MintySlab measure centering for you. Scan Before You Slab.