Pre-Grading Checklist: Centering First, Then Corners, Edges, Surface

Check centering first, because it is the only one of the four grading criteria you can turn into a number and compare against a published standard. Measure the front and back at two points per side, compute the ratio, and hold it against the tolerances: for a PSA 10 the front must be within approximately 55/45 and the back within 75/25; for a PSA 9, 60/40 and 90/10. If the card fails the top-grade line, you already know its ceiling before you pick up a loupe.

Then, and only then, go to corners, edges and surface, which are judgment calls you can prepare for but not measure to a decimal. Last, do the money: as of August 2026 the cheapest open PSA tier is Regular at $79.99 per card, CGC Economy is $20, SGC standard is $15, and a card has to clear that fee plus shipping both ways before grading makes sense.

This checklist puts those steps in the right order, gives you the exact thresholds per grader, a photo protocol that keeps the measurement honest, and a short expected-value calculation you can run on any card in under two minutes.

Step 1: Measure centering (the only objective check)

The procedure

1. Remove the card from its sleeve or toploader. Plastic adds glare and hides the border edge.
2. Lay it flat on a contrasting, matte surface. Scan it at 600 dpi if you can; otherwise photograph it straight down with the phone parallel to the card. Any tilt foreshortens one side and shifts the ratio.
3. For each axis, measure from the cut edge to the outer printed border line (not the artwork) on both opposite sides, at two points per side near the corners. Average each side. Two points catch tilt and diamond cuts.
4. Compute larger ÷ (larger + smaller) × 100, and write it as larger/smaller. Left 2.1 mm, right 2.9 mm → 2.9 ÷ 5.0 = 58% → 58/42.
5. Repeat on the back.
6. Keep the worst axis for the front and the worst axis for the back. PSA's own wording is that centering is "the percent of difference at the most off-center part of the card"; TAG's Pristine standard is a "single measurement" limit. The worst axis governs.

A caliper, a scan plus a pixel ruler, or the free card centering calculator (which measures from a straight-down photo using manual guide lines and maps the result to the PSA, BGS, CGC, SGC and TAG standards) all work. On a 2 mm border, a 0.25 mm error is roughly a six-point swing in the ratio, so the method matters; the trade-offs between ruler, caliper, scanner and app are covered in do card centering apps and tools actually work.

The thresholds

Official front and back tolerances for each company's top two grades:

Read your card against this table and write down its centering ceiling at each company. A front of 54/46 with a back of 62/38 has a PSA 10, CGC 10, SGC 10 Gem and TAG Gem Mint ceiling, but not a BGS 9.5 (back must be 60/40) or any Pristine. The complete ladder down to the low grades is in the centering tolerance table by grade.

The decision at this step

• Front inside 55/45 and back inside the relevant limit: continue to Step 2.
• Front between 55/45 and 60/40: the top grade is off the table on paper. PSA's standards say "a small variance may be permitted on occasion based on the card's overall eye appeal," and collectors report borderline 10s, but plan for a 9 and decide whether a 9 pays. The 55/45 vs 60/40 boundary is dissected in PSA 9 vs PSA 10 centering.
• Front worse than 60/40: a 9 is off the table too. Unless the card is valuable enough that an 8 slab is worth the fee, stop here.

Step 2: Corners

Corners are checked, not measured. Use a 10x loupe or a good phone macro under bright light and look at each corner from the front and the back.

• A sharp corner comes to a clean point with no fraying, no whitening on the back, and no softening of the edge print.
• Look for the small white "dings" on the back of the corner that are invisible from the front. Flip the card; most corner problems show on the back first.
• Check all four. SGC's Gem description asks for "four sharp corners," and BGS grades corners as one of its four subgrade categories; one soft corner is enough to cost a top grade at any company.

Do not try to assign a number. Record each corner as sharp, slightly soft or damaged, and move on.

Step 3: Edges

Hold the card edge-on under the light and run your eye along each of the four edges, then look at them face-on from both sides.

• Whitening on the edge (especially on dark-bordered or dark-backed cards) is the common culprit; it is where the card stock shows through chipped ink.
• Rough or fuzzy factory cuts, tiny nicks, and dents along the edge all count.
• Check the back edges too. Dark backs show edge wear more clearly than fronts.

Edge problems are often paired with centering problems because both come from the cutting step. If one edge is rough and that same side has the narrow border, it is worth asking whether the card sat at the margin of the sheet, which is discussed in why are trading cards off-center.

Step 4: Surface

Surface is the category that hides the most, so give it the most light.

• Tilt the card under a single bright point source (a desk lamp, not diffuse room light) and rock it slowly. Scratches, scuffs and fingerprint smears show as breaks in the reflection.
• Look for print lines (fine straight lines across the art), print dots and specks, and on foils the fine scratch patterns that can come from the factory.
• Check for dents and indentations by looking at the reflection, not the color; a dent distorts the reflected light.
• Look at the back surface too.

SGC's Gem description is a useful checklist in itself: "no breaks in surface gloss, no print or refractor lines, and no visible wear," with "a slight print spot visible under close scrutiny" allowed if it does not detract from the card. BGS's and TAG's subgrade systems treat surface as its own category, and TAG's DIG report inspects front and back surface separately. How the four criteria interact in each company's final grade, including BGS's lowest-subgrade weighting and TAG's eight subgrades, is covered in centering vs corners vs edges vs surface.

Step 5: Pick the grader that fits the card's centering profile

Once you know the centering profile and have an honest read on the other three, match the card to a label.

Which label sells best for a given card is a market question, not a standards question, and collectors' reports vary by category (modern Pokémon, modern sports, vintage). The centering-only equivalences and their caveats are in PSA 10 vs BGS 9.5 vs CGC 10 vs TAG 10: the centering crosswalk.

Step 6: Run the ROI math with 2026 fees

Grading fees as observed on the official pages in August 2026. These change often and some tiers are paused or sold out; check the official page on the day you submit.

Add shipping and insurance both ways to every line; those vary by carrier and declared value and are not in the table.

The expected-value formula

EV of grading = (p10 × V10) + (p9 × V9) + (prest × Vrest) − fee − shipping, compared against Vraw.

• p10, p9, prest are your honest probabilities of the top grade, the next grade, and anything lower. They must sum to 1.
• V10, V9, Vrest are recent sale prices for the card at those grades, which you look up for your specific card.
• If the card is outside the top-grade centering line, set p10 to roughly zero. That is the entire reason centering goes first.

Worked example with hypothetical prices (substitute your card's real comps): suppose a card sells raw for $60, for $220 as a PSA 10 and $80 as a PSA 9. You measured 53/47 front and 58/42 back, corners and edges look sharp, and you found one faint surface line under raking light. Being honest, you put p10 at 0.45, p9 at 0.45 and prest at 0.10 with Vrest around $40.

EV = 0.45 × 220 + 0.45 × 80 + 0.10 × 40 − 79.99 (PSA Regular) − say $15 shipping ≈ 99 + 36 + 4 − 95 = $44, against a raw value of $60. Grading at that fee loses about $16 in expectation. Run the same card through SGC standard at $15: 99 + 36 + 4 − 30 ≈ $109 if you assume SGC 10 Gem and PSA 10 prices are equal, which they often are not; collectors report PSA 10 typically sells for more on modern cards, so plug in SGC 10 comps instead of PSA 10 comps before trusting that number.

Now the same card at 58/42 front: p10 drops to near zero, so EV ≈ 0.85 × 80 + 0.15 × 40 − 95 = 68 + 6 − 95 = −$21 versus $60 raw. Do not grade it for profit.

Gem-rate context for your probabilities

Your p10 should be informed by what actually happens. GemRate data reported by cllct for the first half of 2025 put PSA's overall gem rate at 43% across 8.9 million cards, with TCG at 50% and sports at 34%; CGC was 53% overall and 60% on TCG; Beckett 53% overall; SGC 21% on a vintage-heavy mix. PokeInvest's PSA-derived figures as of August 2026 show a 43.9% overall PSA 10 rate on Pokémon, 60.3% for modern (2023+) cards and 9.9% for vintage (pre-2003). Those are population averages of cards people chose to submit, so a card you have measured and inspected can sit well above or below them, but if your p10 for a vintage card is 0.7, ask yourself why.

Photo protocol for the centering step

• Straight down, lens parallel to the card, card filling most of the frame.
• Single diffuse light source from the side to avoid glare on foils; no flash.
• Matte contrasting background: light for dark-bordered cards, dark for white-bordered cards.
• Card out of all plastic.
• One shot front, one shot back; crop nothing before measuring.
• If two people measuring the same photo get answers three points apart, the photo is the problem (tilt, blur, glare). Rescan.

Common pre-grading mistakes

• Measuring to the artwork instead of the printed border line.
• Measuring one side at one point only, and missing a diamond cut.
• Ignoring the back entirely. PSA's 75/25 and BGS's 60/40 and 55/45 back limits are real and cost 10s.
• Judging centering by eye on a thick or high-contrast border. The same 58/42 looks fine on a yellow border and terrible on a black one; the number is what counts.
• Treating a 56/44 as "basically 55/45" in the EV math. Set p10 to "maybe," not "probably."
• Forgetting that a qualifier or a lower grade, not a "no grade," is the usual result of bad centering. You pay the fee either way.

Bottom line

• Centering first: it is the only criterion with a published number you can measure at home. Front within approximately 55/45 and back within 75/25 for a PSA 10; 60/40 and 90/10 for a 9; BGS 9.5 needs 55/45 both ways and a 60/40 back; BGS 10 and CGC/SGC Pristine need 50/50; TAG Pristine ~51/49.
• Measure at two points per side, front and back, out of the sleeve, straight down; worst axis governs.
• Then corners, edges and surface under magnification and raking light; record findings, do not invent numbers.
• Match the centering profile to the grader whose top label it can actually reach, then check which label your buyers pay for.
• Run EV = p10 × V10 + p9 × V9 + prest × Vrest − fee − shipping against the raw price, using August 2026 fees (PSA Regular $79.99, CGC Economy $20, SGC $15, TAG Basic $22 with a 10-card minimum) and confirming on the official pricing pages.

Frequently asked questions

What should I check before sending a card to PSA?+

Check centering first, with a measurement rather than a glance: the front must be within approximately 55/45 and the back within 75/25 for a PSA 10, or 60/40 and 90/10 for a 9. Then inspect all four corners under magnification, run the edges against a light for whitening and chipping, and examine the surface at raking light for scratches, print lines and dents. Finally compare PSA 10 and PSA 9 sale prices against the fee before deciding.

Why check centering before corners, edges and surface?+

Because centering is the only one of the four grading criteria you can reduce to an exact number at home and compare against a published tolerance. Corners, edges and surface are judgment calls. If a card measures 62/38 on the front, it cannot meet any company's top-grade centering standard no matter how clean the rest is, so measuring first saves you the time and the fee on cards that cannot gem.

How much does it cost to grade a card in 2026?+

As of August 2026: PSA Regular is 79.99 dollars per card (70-80 business days, 1,500 dollar max value) with its cheaper Value tiers temporarily paused; CGC Bulk is 17 dollars (25-card minimum, 150 days) and Economy 20 dollars; SGC standard is 15 dollars for cards up to 1,500 dollars declared value; BGS base 14.95 is listed as sold out with Express at 79.95; TAG Basic is 22 dollars (10-card minimum) but regular tiers are paused. Always check the official pricing pages.

Is my card worth grading?+

Run the math: estimate the probability of the top grade from your own inspection, multiply by the top-grade sale price, add the probability of the next grade times its price, and subtract the grading fee plus shipping both ways. If that number is not clearly above what the card sells for raw, do not grade it for profit. Centering is the first filter, since a card outside the top-grade tolerance has a near-zero chance of the top grade.

What grade will my card get if it measures 58/42?+

On centering alone, 58/42 is inside the PSA 9 limit (approximately 60/40) and outside the PSA 10 limit (approximately 55/45), so PSA 9 is the realistic ceiling. The same measurement is a BGS 8 front (60/40 both ways or better), a TAG 9 Mint front (about 60/40), an SGC 9 and a CGC 9 for sports cards. Other flaws can lower it further; nothing else can raise it above the centering ceiling.

Which grader should I choose based on centering?+

If the front is 50/50 and the back is inside 55/45, BGS 10 Pristine, CGC Pristine 10, SGC 10 Pristine and TAG Pristine (51/49 front) are all in reach. If the front is 51/49 to 55/45 and the back is inside 60/40, BGS 9.5, PSA 10, CGC Gem Mint 10, SGC 10 Gem and TAG Gem Mint are in reach. Between 55/45 and 60/40 you are looking at a 9 everywhere, so choose on price, turnaround and which label your buyer pays most for.

Sources & further reading

• PSA Grading Standards (official)
• PSA Pricing (official)
• CGC Cards Services and Fees (official)
• SGC Services and Pricing (official)
• TAG Grading: available grading services (official help center)
• cllct: How many cards grade as 10s? Gem rate at 43% so far in 2025