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ACE 10: centering requirements

From an August 2026 cross-check of ACE’s published scale. Checked 2026-08-22. Official page.

Gem Mint 10: 60/40 front, 60/40 back

Better than 60/40, front and back.

Measure your card against this line →

Either side of it

Ratios that reach Gem Mint 10 but not the grade above, on the front line alone: 50/50 · 52/48 · 53/47 · 55/45 · 57/43 · 58/42 · 60/40.

ACE, every grade

GradeFrontBack
Gem Mint 1060/4060/40
Mint 965/3570/30
NM-MT 870/3075/25
NM 775/2580/20
EX-MT 680/2080/20
EX 580/2080/20
VG-EX 480/2080/20
VG 385/1585/15
Good 285/1585/15
Poor 185/1585/15

Questions

What centering does ACE require for a 10?

Gem Mint 10: 60/40 front, 60/40 back.

Which centering ratios reach exactly a ACE 10?

On the published front lines alone: 50/50, 52/48, 53/47, 55/45, 57/43, 58/42, 60/40 — better than the Gem Mint 10 line but not the next line. Corners, edges and surface can only hold or lower the grade.

How is the ratio measured?

Compare the two borders on each axis: a card whose left border is 57% of left plus right is 57/43. Services judge the worse axis, front and back separately. SlabbyPrep measures both from a photo to a hundredth of a millimetre.

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