SP Card Centering Calculator Portfolio
Card Grading Tool · PSA · BGS · SGC · CGC

Centering
Calculator.

Enter your card's border measurements below — top, bottom, left, right — for both the front and back face. Centering percentages and projected grades update instantly.

Unit
BORDERS
PSA Gem Mint 10 55/45 front · 75/25 back BGS Pristine 10 50/50 both faces SGC Pristine 10 50/50 both faces CGC Gem Mint 10 55/45 front · 75/25 back PSA Mint 9 60/40 front · 90/10 back BGS Gem Mint 9.5 55/45 front · 70/30 back SGC Mint 9 60/40 front · 60/40 back Worst axis determines centering score PSA Gem Mint 10 55/45 front · 75/25 back BGS Pristine 10 50/50 both faces SGC Pristine 10 50/50 both faces CGC Gem Mint 10 55/45 front · 75/25 back PSA Mint 9 60/40 front · 90/10 back BGS Gem Mint 9.5 55/45 front · 70/30 back SGC Mint 9 60/40 front · 60/40 back Worst axis determines centering score
01 Front Face
Top / Bottom
↑
Top
mm
↓
Bottom
mm
Left / Right
←
Left
mm
→
Right
mm
02 Back Face
Top / Bottom
↑
Top
mm
↓
Bottom
mm
Left / Right
←
Left
mm
→
Right
mm
FRONT
Enter measurements
— — — —
Left / Right
—
Top / Bottom
—
Projected Grade
PSA
—
BGS
—
SGC
—
CGC
—
Centering — Front
Left / Right —
Left Right
Top / Bottom —
Top Bottom
How to Measure
Use a digital caliper for precision. Measure each border from the card's printed image edge to the physical card edge, perpendicular to the border.
Worst Axis Rule
Of your two axes (L/R and T/B), the worst ratio is used to determine centering. A 52/48 L/R with a 70/30 T/B gives you a 70/30 score for that face.
PSA Back Tolerance
PSA is uniquely lenient on card backs — up to 75/25 still qualifies for a Gem Mint 10. Most other graders require 55/45 or better on both faces.
BGS / Pristine Note
BGS uses 9.5 as Gem Mint. A BGS 10 "Pristine" demands 50/50 on both faces — effectively perfect centering. Extremely rare in modern cards.