A free card centering calculator and checker. It measures how well a card is centered from a photo you already have. A listing photo works, a photo somebody sent you works, and a card you do not own yet works. There is no account to make, nothing is stored, and the photo is never uploaded: it is read and measured inside your own browser.
You do two things and the tool does the rest. First you drag four corners onto the card in the photo. Then you put four markers on the edge of its printed border. Both can be snapped onto the lines the tool finds, so a rough placement is good enough. The photo is flattened before anything is measured, which is why a picture taken at an angle still reads correctly instead of reporting a centered card as off center. No flat scanner is needed.
The reading is two numbers for each face: how the left and right borders split, and how the top and bottom borders split. 50/50 is perfectly centered. 70/30 means one border is more than twice as wide as the one facing it.
The tool then says what that reading allows under PSA's published centering limits, which the page loads from our server rather than keeping its own copy of. The front and the back are allowed different amounts, and a grade needs both faces to pass, so when only one face has been measured the tool says what that face allows and stops there. It will not turn one face into a card grade.
The measurement is pure geometry, so it works on any card with a printed border: sports cards, Pokemon and other trading card games included. Identifying and pricing a card is a different job, and that half of Raw to Slab.ai does not cover trading card games yet.
Centering is one of the four things a grade turns on. Corners, edges and surface decide the rest, so this is a measurement and not a predicted grade. Only PSA is modelled, and only down to the grade where centering stops being the limit that binds.
Nothing on this page needs an account. An account is what lets you keep a measurement with the card it belongs to, beside a value worked out from real sold listings. Raw to Slab.ai is not affiliated with PSA; the grade names describe the published limits being measured against. Card values are estimates computed from public sold-listing data, not appraisals, offers, or investment advice.
Photograph the card, or use a photo you already have, and open it here. Drag the four corners onto the card, then drag four markers onto the inside edge of its printed border. The tool flattens the photo, measures the four border widths and reports the left/right and top/bottom split. You do not need a scanner, a ruler or a grading loupe.
No, and that is the point. The card is rectified from the four corners you place, so a photo taken at an angle, in your hand or through a toploader still measures correctly. Without that step a tilted photo makes a centered card look off center, which is why a flat scan is the usual thing to be asked for.
No. The photo is read and measured in your own browser and is never sent to us. Nothing is saved either, so closing the tab ends it. The only thing this page asks our server for is the table of published PSA centering limits, and that request carries no photo and no account.
Yes for the measurement. Centering is geometry, so any card with a printed border measures the same way, and it is scored against the one PSA table this page loads, the same table a baseball card is scored against. Identifying and pricing a Pokemon card is a different job, and Raw to Slab.ai does not cover trading card games for that yet.
No, and it will not pretend to. Centering is one of four things a grade turns on; corners, edges and surface decide the rest. What this tool tells you is the highest grade your centering does not rule out, which is the half of the question that can be measured from a photo. Measure both faces and it names that grade; measure one and it tells you what that face allows and stops, because the front and the back are allowed different amounts.
That is a money question, not a measurement, and it has its own free tool. The grading calculator at /grading-calculator compares what the card sells for raw against what it sells for graded, minus the fees, and says plainly when grading does not pay.