Pokemon Card Centering Tool and Card Centering Calculator

1. Flatten the photo

   Drop a JPG, PNG or WebP up to 15 MB. Four corner handles snap to the card; adjust them and the 4-point warp maps it onto a true 63.5 × 88.9 mm plane.

2. Place the 8 lines

   Outer lines sit on the cut edge, inner lines on the printed frame. Drag them under the 400% loupe or nudge with arrow keys: 1 px, Shift 10 px, Alt 0.1 px.

3. Read the matrix

   L/R and T/B update as you drag. Six lamps show pass, amber borderline or fail for PSA 10, BGS 10, BGS 9.5, CGC Pristine 10, CGC 10 and SGC 10.

Tilt the phone and the near side of the card covers more pixels than the far side, so its border reads wider. On the built-in tilted specimen, a card that truly measures 52.0/48.0 reads 61.0/39.0 when you measure straight across the raw photo. That nine-point drift drops its ceiling from PSA 10 to PSA 8, past even the 60/40 limit for a 9.

The 4-point homography fixes this by mapping the four card corners onto a flat rectangle at 20 px per mm, so every millimeter of border gets the same number of pixels. Toggle perspective correction off and on: the raw and corrected readings stay side by side, and the Net EV on that specimen swings from −$4.00 to +$44.00.

Corner handles find the card outline automatically. On rounded corners they are fitted from the four straight edges, so each handle lands where two edges would meet. If the lines still look skewed after the warp, the rotation input trims ±5.0° in 0.1° steps. Then the card centering calculator measures a true rectangle, not a trapezoid.

PSA 10, BGS 9.5, CGC 10 and SGC 10 all allow 55/45 on the front, so one front reading answers four questions. The backs differ: PSA and CGC accept 75/25, Beckett's current page gives 60/40 for BGS 9.5, and SGC publishes one figure per grade without naming a side, so the table shows its back as not stated.

The strict tiers sit above them. BGS 10, the centering a Black Label needs, takes 50/50 on the front and 55/45 on the back. CGC Pristine 10 takes 50/50 on the front and states no back figure, so that lamp is judged on the front alone. Every row lists its source page and the 2026-10-31 check date.

The differences matter on a lopsided back. The dual-side specimen, 53/47 front and 71/29 back, passes PSA 10 and CGC 10, yet 71/29 exceeds the 70/30 back Beckett lists for BGS 9, so its BGS centering ceiling drops to 8. The lamp matrix and this table read the same data file, so screen and chart always agree.

Net EV = P10 × V10 + (1 − P10) × V9 − raw − fee. V10 and V9 are the PSA 10 and PSA 9 prices you enter, raw is what the card sells for ungraded, and fee is the per-card grading cost, $19 by default with $15 and $25 shortcuts. Fold shipping and insurance into the fee if you want them counted.

P10 is the chance of a 10: your baseline gem rate, 60% by default, times a front, a back and a corner factor. The front factor is 1 up to 52.5, 0.5 at 55.0 and 0 from 56.0. The back factor is 1 up to 70, 0.5 at 75 and 0 from 76. The baseline is your estimate for surface and edges.

Break-even gem rate = (raw + fee − V9) ÷ (V10 − V9). On the Gem Mint specimen, raw $59, PSA 10 $300, PSA 9 $100 and a $19 fee give P10 60.0% and Net EV +$142.00. Because a PSA 9 alone covers raw plus fee, break-even shows 0.0%. Every number updates live and stays free for single cards.

The classic trap is a card that looks centered at arm's length. The off-center specimen reads 58.1/41.9, which caps PSA at 9 and sets P10 to 0. With raw $44, PSA 9 $45 and a $19 fee, Net EV is −$18.00 and the call is SELL RAW. It would need a 13.3% gem rate just to break even.

The second trap is an uncorrected photo, which can flip the call either way: the tilted specimen reads −$4.00 raw and +$44.00 flattened. The third is skipping the back, since a 71/29 reverse trims the back factor to 0.9. The fourth is a cheap card: at $10 raw and a $19 fee, with PSA 9 at 1.2× raw and PSA 10 at 3×, break-even needs 94.4%.

Corners are the last trap. A whitened corner lowers P10 even when centering is perfect. The off-center specimen's bottom-right corner scores 3.3% on the Corner Whitening Index, which on its own would cut the corner factor to 0.54. Check all four loupes before you count on a 10, and lower the baseline for cards you have not inspected under light.

Each corner gets a 4 × 4 mm window on the flattened card. Inside it, only a 0.75 mm band along the cut edge is scored, with the 3 mm corner radius masked so the table behind the card stays out. A pixel counts as white when it is near gray and bright: at least 200 on a 0–255 scale and 45 above the band median.

CWI is white pixels divided by band pixels, shown to one decimal. Up to 1.0% keeps the corner factor at 1; each further point removes a fifth, so 2.0% gives 0.8, 3.3% gives 0.54 and 6.0% or more gives 0. The worst corner across front and back sets the factor, so one bad corner outweighs three clean ones.

White-bordered stock reads n/a, because a band whose median brightness is 215 or higher has no dark ink for whitening to show against. Those corners drop out of P10, which is why the vintage specimen shows n/a on all four. Inspect them by eye in the 400% loupes, and lower the baseline gem rate if you find wear.

Every single-card measurement in this card centering tool online is free with no sign-up: perspective correction, eight lines, the loupe, the lamp matrix, corner whitening and single-card EV. Free exports are a one-side proof PNG up to 1000 px wide, 1000 × 1464 px on a standard card, with a PRE-GRADE PREVIEW banner, plus a three-line TXT of L/R, T/B and the worst axis.

Pro adds three files. The batch ROI workbook queues up to 30 cards and exports a CSV with each card's ceilings, P10, Net EV, break-even and call, plus a PSA packing-slip PDF of the cards marked SUBMIT. The pre-grade certificate is a front-and-back PDF with mm and pixel deviation tables, plus a 300 DPI four-corner 400% loupe composite PNG.

The seller listing proof is a 2000 × 2000 px, 300 DPI PNG for eBay, TCGplayer or Whatnot with the gauge, a corner sidebar and a CENTERING nameplate. Pro costs $4.99 for a 7-day pass (was $9.99), $7.99 a month (was $15.99) or $19.99 lifetime (was $39.99). For scale, PreGradeCards charges $9.99 for 25 cards.

Pick the template before you flatten. Standard 63.5 × 88.9 mm, 2.5 × 3.5 in, fits Pokémon and most sports cards on a 1270 × 1778 px plane. Japanese size, 59 × 86 mm, fits the smaller stock some TCGs use. Vintage tall, 67 × 95 mm, fits older baseball cards and loads by default on the sports card calculator.

The template sets the rectangle the warp maps the corners onto, so it changes the millimeter readouts, not the ratio. A 64 px left border reads 3.20 mm on the standard plane and 2.97 mm on the Japanese one, while the L/R share stays put. The certificate and Manual mode both work in millimeters, so match the template to the card.