How to Check Centering on Pokémon Cards with Your Phone (App + Manual Method, 2026)

Quick answer: how to check Pokémon card centering on a phone

Photograph the card straight-on with your phone, measure the left vs right and top vs bottom border widths, and divide the larger border by the total of each pair. A card with a 3.0 mm left border and 2.0 mm right border is 60/40. Use the worse of the two axes. PSA's Gem Mint 10 standard allows roughly 55/45 to 60/40 on the front and 75/25 on the back. An AI tool like PreGradeCards' centering analysis does the measuring from your photo and reports the ratios for both sides.

Centering is the most objective part of a grade and the most common reason modern Pokémon cards miss a 10. It's also the easiest to check at home — no loupe needed, just a square photo.

What centering means on a Pokémon card

Centering describes how evenly the printed image sits inside the card's borders. On a standard yellow-bordered Pokémon card, you compare the width of the left yellow border with the right one, and the top with the bottom. A perfectly centred card is 50/50 on both axes; a card whose image has drifted toward the right might be 62/38 left/right.

Graders look at both sides. The front matters most, and companies allow more tolerance on the back — but the back still counts, and Pokémon's blue back border makes off-centre backs easy to see.

Centering standards: PSA vs BGS vs CGC vs SGC vs TAG

PSA's figures are from its published grading standards. Other companies' published or widely reported tolerances vary by year and card type, so check the company's current standards page before a big submission. Our full guide: card centering requirements by company.

Method 1: check centering with an app (fastest)

1. Open PreGradeCards centering analysis or the full grading tool in Safari or Chrome (no download; 2 free credits for new accounts).
2. Photograph the front on a dark background, phone parallel, small margin on every side.
3. Photograph the back the same way.
4. Read the left/right and top/bottom ratios for both sides, plus which grade range they allow.

The AI finds the card edge and the inner print edge automatically, so it isn't fooled by rounded corners or slight rotation. The full grade adds corners, edges and surface — useful because perfect centering doesn't help if a corner is whitened.

Method 2: measure centering manually on your phone

1. Take a square photo as above.
2. Open it in Photos and zoom in on the left border at the middle of the card.
3. Use a ruler app, a markup tool, or count pixels in an editing app: note the left border width.
4. Repeat for right, top and bottom at their midpoints.
5. Compute the ratios (below). Repeat for the back.

Alternatively, place a transparent centering ruler or a printed centering grid over the card and photograph it. Manual methods are accurate if you measure at the midpoint of each edge and the photo isn't tilted.

The centering math (with worked examples)

Ratio = larger border ÷ (left + right) × 100, written as larger/smaller.

• Left 2.6 mm, right 2.0 mm → 2.6 ÷ 4.6 = 56.5% → 57/43 left/right.
• Top 2.2 mm, bottom 2.4 mm → 2.4 ÷ 4.6 = 52.2% → 52/48 top/bottom.
• Front centering = the worse axis = 57/43 — inside PSA's 10 range, outside BGS Pristine.

Pixel counts work the same way: 130 px vs 98 px is 130 ÷ 228 = 57/43. Units don't matter because it's a ratio.

Getting a square photo (the part people get wrong)

Centering errors from tilt are the most common home-measurement mistake. A phone held a few degrees off parallel makes the near border look wider. To avoid it:

• Turn on grid and level (iPhone: Settings › Camera › Grid; Android: camera settings › grid lines).
• Use the main lens or 2x zoom from 20–25 cm; never the ultrawide.
• Rest the phone on a stand or stack of books so it's flat and still.
• Leave a small margin around the card so edges are visible.
• Take the card out of its sleeve — sleeve edges look like borders.

More in how to photograph cards for grading on iPhone and Android.

Pokémon-specific centering quirks

• Modern sets vary a lot. Some print runs are notoriously off-centre left/right; checking every hit is worth it.
• Japanese prints are often (not always) better centred than English equivalents.
• Vintage WOTC cards frequently have top/bottom shifts; a vintage 60/40 is common and still grades 9 at PSA.
• Diamond cuts and miscuts (borders that taper) measure differently at each end — measure at the worst point.
• Back centering on the blue border is easy to see; PSA's 75/25 allowance is generous, BGS and SGC are not.

Full arts, alt arts and borderless cards

Full-art and alt-art Pokémon cards still have a thin border or a frame line, and graders measure centering from that. On borderless-style designs, centering is judged from the print's alignment to the card edge and from the back. AI tools handle this by detecting the frame line; when measuring manually, use the thin silver or coloured frame instead of the outer card edge. Textured surfaces can also cast tiny shadows — use soft, even light for centering photos and save the side-light shot for surface.

What to do with your centering number

Then check the rest of the card with an AI pre-grade and estimate fees with the PSA grading cost calculator.

Common centering-check mistakes

• Measuring at the corners instead of the midpoints.
• Tilted phone or ultrawide lens.
• Measuring a sleeve edge instead of the card edge.
• Forgetting the back.
• Using the average of both axes instead of the worse one.
• Assuming a centred card is a 10 — corners, edges and surface still count.

What PSA's OC qualifier means

If a card meets every other requirement for a grade but its centering falls below that grade's minimum, PSA may assign the grade with an OC (off-centre) qualifier — for example "PSA 8 OC". Qualified grades usually sell at a significant discount to the same number without the qualifier. PSA also notes a small leeway on front centering for cards grading NM 7 or better. The practical lesson: a card that measures far outside the range you want is better sold raw than sent in hoping for leniency. See our PSA qualifiers explained.

Worked examples from real cards

Modern alt art, left/right 62/38, top/bottom 51/49: front centering is 62/38 — just outside PSA's 10 range. Even with flawless corners, a realistic ceiling is PSA 9. If the PSA 9 price is close to raw, sell raw.

Vintage holo, left/right 54/46, top/bottom 64/36: the worse axis is 64/36, a PSA 9 range for centering. Vintage cards are valued even at 8–9, so this can still be worth grading if corners are clean.

Japanese promo, 52/48 and 50/50, back 70/30: front is excellent and back is within PSA's 75/25. A strong PSA 10 candidate if surface and corners pass — and a possible CGC Pristine candidate.

Measuring back centering on the blue border

The Pokémon back's dark blue border makes measurement easy: use the outer edge of the yellow-free blue frame against the card edge. Measure at the midpoint of each side, compute left/right and top/bottom, and take the worse. Most backs pass PSA's generous 75/25, but backs often fail BGS and SGC standards, which is why those companies are riskier for off-centre backs.

How much does phone tilt distort centering?

Perspective distortion makes the side of the card closer to the lens look larger. A small tilt can shift a measured ratio by several points, enough to turn a true 56/44 into an apparent 60/40 or worse. That is why the level indicator matters and why the main lens from 20–25 cm beats the ultrawide up close. If two photos give different ratios, trust the one where the card's edges are perfectly parallel to the frame, or average two careful shots taken from opposite sides.

Centering tools compared

For a single card, any method works if the photo is square. For a stack of hits after a booster box, an AI tool that measures both sides and checks the rest of the card is the fastest way to find the true PSA 10 candidates.

Frequently Asked Questions

Sources & Further Reading

• PSA Grading Standards (PSA Magazine)
• Edge Grading: centering explained
• Beckett grading scale
• CGC Trading Cards grading scale

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