Card Centering Calculator
Drag one box to the card edge and one to the frame edge. You get exact centering percentages and every grading tolerance the card clears. Your photo never leaves your device.
How to measure
- Lay the card flat and shoot straight down. A tilted photo gives confidently wrong numbers.
- Drag the amber box to the outer edge of the card.
- Drag the cyan box to where the printed frame or artwork begins.
- Read the ratio. 50/50 is perfect, and the further from 50 the worse the centering.
Drag slowly and watch the magnifier. A few pixels of slop at this size is a whole grade tier.
Photo taken at an angle? Run it through the Card Photo Scanner first and it lands here already flattened, with the boxes in place.
Front centering tolerances
| Front ratio | Grades it allows |
|---|---|
| 50/50 | BGS 10 Pristine, CGC 10 PristineBoth axes |
| 50/50 & 55/45 | BGS 9.5 Gem MintOne axis 50/50, the other 55/45 |
| 55/45 | PSA 10 Gem Mint, CGC 10 Gem Mint, BGS 9 Mint |
| 60/40 | PSA 9 Mint, CGC 9 Mint, BGS 8.5 |
| 65/35 | PSA 8 NM-MT, CGC 8, BGS 8 |
| 70/30 | PSA 7 NM, CGC 7, BGS 7 |
Taken from PSA, Beckett and CGC's own published standards. BGS figures are for the centering subgrade, which feeds the overall grade rather than setting it. CGC's ratios below Gem Mint are published for sports and non-sports cards; its TCG descriptions give no ratio. SGC is not listed because it no longer publishes per-grade centering tolerances.
Beckett's two-axis rule
Beckett is the one grader that doesn't use a single number. A BGS 9.5 needs 50/50 on one axis and 55/45 on the other, so a card measuring 55/45 both ways is a BGS 9, not a 9.5.
This tool checks both axes separately for that reason. Most centering calculators collapse everything to one figure and get Beckett wrong.
The 5% rule most people miss
PSA publishes a documented allowance: for cards grading NM 7 or better, up to 5% of extra front-centering leeway can be granted at the grader's discretion when eye appeal is strong. A card measuring 60/40 can still reach a 10 on that basis.
That's why PSA rows show an amber band rather than a hard fail between the published figure and the leeway limit. In that band you're relying on a judgment call, not a standard, and no other grader publishes an equivalent allowance.
Why centering decides the grade
Centering is the one criterion you can measure before you pay. Corners, edges and surface need an expert eye, but centering is arithmetic, and it's the most common reason a card that looks flawless comes back a 9.
PSA measures it as the difference at the most off-center part of the card, so your worst axis is what counts. That's the number this tool leads with.
Centering is one subgrade. CardIQ reads the rest.
This tool measures centering. The CardIQ app identifies the card, estimates its full PSA grade, pulls live market value and tells you whether grading it actually pays. Free to try on iPhone and iPad.