How to Pre-Grade a Card: A Step-by-Step Checklist
Quick answer
To pre-grade a card, light it well, measure centering on both sides, inspect each corner and edge, tilt the surface under a single light, find the single flaw most likely to cap the grade, then compare against the standard and the economics. The ceiling flaw decides the result.
Set up
You need three things: good light, a clean dark surface and your phone or a loupe.
- A single bright lamp you can move. Flat room light hides flaws.
- A dark, matte surface so edges and whitening stand out.
- A loupe or macro camera for corners and edges.
- A soft cloth to rest the card on. Do not wipe the card with it.
Handle the card by its edges, ideally with clean, dry hands or soft gloves.
Step 1: Measure centering
Check the front and the back.
- Photograph the card straight on, or scan it.
- Measure the left, right, top and bottom borders.
- Convert each pair to a ratio: larger border divided by the sum of both.
- Compare with the standard you are targeting. PSA's published Gem Mint tolerance is approximately 55/45 on the front and 75/25 on the back.
Details are in how to measure card centering.
Step 2: Inspect the corners
Check all four corners, front and back, under angled light and magnification. Note any softness, whitening, fraying or dings. The corner guide shows the wear progression.
Step 3: Inspect the edges
Look along each edge for whitening, chipping and roughness, on both sides. Dark borders show wear immediately, so look hardest on light-bordered cards. See the edge guide.
Step 4: Inspect the surface
Tilt the card slowly under a single light and look for scratches, print lines, dents and dull patches. Foil and holo cards need several angles. See the surface guide.
Step 5: Find the ceiling flaw
Write down the worst thing you found in each of the four areas. Then pick the one that would hurt the grade most. That is the ceiling flaw. If it is centering at 60/40, the ceiling is a 9. If it is a soft corner, the ceiling is probably a 9 or lower.
Under a single-grade system like PSA, the ceiling flaw sets the result. Under BGS-style subgrades, it sets the lowest subgrade, which pulls the overall down. See BGS subgrades explained.
Step 6: Decide
- Look up sold prices at the grade your ceiling flaw implies, not the grade you hope for.
- Add the grading costs.
- Compare with the raw value using the ROI formula.
- Submit only if the result is positive with a margin.
Speed this up
If you would like the measurements done for you, Before The Grade does steps 1 to 5 from photos, with the evidence pinned to the card so you can verify each finding by eye. Treat any tool as a second opinion, and check the card in hand before you pay.
Frequently asked questions
How long does a pre-grade take?
A careful manual check of one card takes a few minutes. A tool that analyzes uploaded photos can return a report in a short time, after you have taken the photos.
What is the most important thing to check first?
Centering. It is measurable, it does not change and it often decides the top grade on its own.
What is a ceiling flaw?
The single flaw most likely to cap the grade, such as off-center borders or one soft corner. Under single-grade systems, one flaw is enough to keep a card out of the top tier.
Before you pay for grading
Put your card through the same tests, free.
Before The Grade turns the grading companies' published standards into measurable checks. Upload the front and back of a card and get a condition report that shows every measurement and every flaw it found, so you can judge the prediction yourself. 1 free report when you confirm your email.
Grading companies revise their standards and service levels. Figures here reflect what each company has published at the time of writing, so confirm details on the company's own site before you submit. Before The Grade is independent and is not affiliated with PSA, BGS, CGC or SGC.