PSA 10 Centering Calculator with Front and Back Check

1. Measure the front

   Upload the front or keep the dual-side specimen. Flatten it with the four corner handles and set the eight lines; the front worst axis appears as, for example, 53.0 L/R.

2. Add the back

   Upload the back photo. It gets its own eight lines, and both sides combine into one PSA ceiling with the limiting side named underneath.

3. Enter the prices

   Type the raw price, PSA 10 and PSA 9 comps and your fee. P10, Net EV, break-even gem rate and SUBMIT or SELL RAW update with every line you move.

A PSA 10 needs both sides inside their limits, and nothing is averaged. A 54/46 front with a 76/24 back fails, because 76 is past 75, and even a 50/50 front cannot rescue it. The lamp turns amber when a side is less than one point over its line, so a 75.5 back shows borderline rather than pass.

The limiting side is the one with less room: 55.0 minus the front worst axis against 75.0 minus the back worst axis. On the dual specimen the front has 2.0 points and the back 4.0, so the readout says Front · 53.0 of 55.0 max. With a 74/26 back the room would be 1.0 and the back would limit instead.

The wider back allowance still costs something in the EV model. The back factor stays at 1 up to 70/30, falls to 0.5 at 75/25 and reaches 0 at 76/24. The 71/29 back on the specimen sets it to 0.9, which removes a tenth of the gem odds before the front is even counted.

PSA lists a centering limit for each grade: 55/45 on the front for 10, 60/40 for 9, 65/35 for 8, 70/30 for 7, 80/20 for 6 and 85/15 for 5. The back allows 75/25 for 10 and 90/10 for 9 through 5. A 57/43 front is two points past the 10 line and three inside the 9 line.

Centering is a ceiling, not a floor. A 57/43 card with a scratch can still grade 8, but no amount of perfect surface lifts it to 10. In the P10 model a 57.0 front gives a front factor of 0, so Net EV is simply the PSA 9 price minus raw and fee. The ladder highlights the step your card reaches.

PSA writes “approximately” for grades 10 through 7 and notes that a small variance may be allowed for eye appeal. The calculator applies the numbers strictly, so 55.0 passes and 55.1 shows amber. Price amber cards at PSA 9 values, and treat the 58.1/41.9 trap specimen as a firm PSA 9 ceiling.

Net EV = P10 × V10 + (1 − P10) × V9 − raw − fee. P10 × V10 is the share of the PSA 10 price you can expect, and (1 − P10) × V9 assumes every miss lands at PSA 9. Raw is the sale you give up by submitting; fee is the per-card grading cost. P10 is rounded to four decimals, money to the cent.

Gem specimen: raw $59, PSA 10 $300, PSA 9 $100, fee $19. A 51.2 front keeps every factor at 1, so P10 is 60.0%. Graded value is $180 + $40 = $220, and Net EV is $220 − $59 − $19 = +$142.00. The PSA 9 alone covers raw plus fee, so break-even is 0.0% and the call is SUBMIT TO PSA.

Trap specimen: 58.1 front, P10 0%, graded value $45, so −$18.00 after $44 raw and the $19 fee, and the call is SELL RAW. Dual specimen: front factor 0.9 at 53.0 and back factor 0.9 at 71.0 give P10 = 0.6 × 0.9 × 0.9 = 48.6%. Graded value $121.50 + $41.12 = $162.62, minus $70 and $19, is +$73.62.

Break-even gem rate = (raw + fee − V9) ÷ (V10 − V9): the P10 at which submitting and selling raw pay the same. The grid assumes a PSA 9 sells for 1.2× raw and a PSA 10 for 3× raw, then runs raw prices from $10 to $500 against $15, $19 and $25 fees. Those multiples are a placeholder; real comps vary by card.

Under those assumptions the formula simplifies to (fee − 0.2 × raw) ÷ (1.8 × raw). A $10 card with a $19 fee needs 94.4%, and with a $25 fee it is not reachable at all. At $50 raw and $19 it falls to 10.0%. Once raw reaches five times the fee, $95 at $19, a PSA 9 alone covers the cost.

Use the grid to triage a stack before you measure, then enter real comps for the cards that survive. If your gem rate on a set runs closer to 30% than 60%, lower the baseline input and P10, Net EV and the decision follow. The dual specimen, with its real comps, breaks even at 5.3%.

For one card the whole flow is free: measure, price, read the call, and save the 1000 px proof PNG and three-line TXT. For a stack, the Pro batch ROI workbook queues up to 30 cards and exports a CSV with front and back ratios, ceilings at all four companies, P10, Net EV, break-even and the decision for each card.

The packing-slip PDF lists only the cards marked SUBMIT, with front and back centering, expected graded value and fee, plus checkboxes for penny sleeve, card saver and photographed. With the gem, trap and dual specimens queued, two cards make the slip, and the CSV total row shows $38.00 in fees and +$215.62 in net EV.

Pro costs $4.99 for a 7-day pass, $7.99 a month or $19.99 lifetime. For comparison, cardgrading.app sells 10 reads for $9.99 and GradeValue Pro is $9.99 a month, with a $4.99 first month. Single-card EV, the break-even rate and the SUBMIT or SELL RAW call on this page stay free.