Does back centering affect a card grade?

Yes, but every service tolerates more on the back than the front. PSA and CGC allow up to 75/25 on the back for their top standard grade, TAG allows 65/35, BGS allows 55/45 for a Pristine 10, and SGC is the strictest at 55/45 for an SGC 10.

Card Centering Requirements by Grading Company

Q: What centering do you need for a PSA 10?

PSA allows up to 55/45 front centering for a PSA 10 (Gem Mint), and up to 75/25 on the back. A card at 60/40 on the front caps at PSA 9.

Q: Is 60/40 centering bad?

A 60/40 card misses the gem mint threshold at PSA, BGS, CGC, SGC, and TAG, which all require 55/45 or better on the front. It still qualifies for strong grades (PSA 9, BGS 8, CGC 9) and meets the ACE 10 threshold, the most lenient top grade among the major services.

PSA, BGS, CGC, SGC, TAG, and ACE · Last updated July 3, 2026

The short answer: most major graders require 55/45 or better front centering for their top standard grade (PSA 10, BGS 9.5, CGC 10, SGC 10, TAG 10). ACE is the outlier, allowing 60/40 for an ACE 10. Pristine designations (BGS 10, CGC Pristine 10, SGC 10 Pristine) require essentially perfect 50/50 centering. Backs are graded more loosely everywhere.

Centering ratios describe how the printed area sits between a card's borders, written as the larger side over the smaller side: 55/45 means one border takes 55% of the total margin and the opposite border takes 45%. Each axis (left/right and top/bottom) is measured separately, and a card is judged on its worst axis. Every major grading company publishes centering standards, but they live on six different websites in six different formats. This page collects all of them in one place, front and back, for every grade. The same thresholds power the grade badges in Rectifi.

Top-Grade Comparison

What each service requires for its highest grades:

Service	Grade	Front (max)	Back (max)
PSA	10 (Gem Mint)	55/45	75/25
BGS	10 (Pristine)	50/50	55/45
BGS	9.5 (Gem Mint)	55/45	60/40
CGC	Pristine 10	50/50	50/50
CGC	10 (Gem Mint)	55/45	75/25
SGC	10 (Pristine)	50/50	50/50
SGC	10 (Gem Mint)	55/45	55/45
TAG	10 (Pristine)	51/49	52/48
TAG	10 (Gem Mint)	55/45	65/35
ACE	10 (Gem Mint)	60/40	60/40

The pattern: 55/45 front centering is the gem mint bar almost everywhere. The services differ far more on backs, on Pristine tiers, and on how quickly grades fall off below the top. The per-service tables below cover every grade.

PSA Centering Requirements

PSA grades on a 10-point scale and publishes centering tolerances per grade. The back is graded loosely: 75/25 for a 10, then a flat 90/10 for everything from 9 down.

PSA grade	Front (max)	Back (max)
10 (Gem Mint)	55/45	75/25
9 (Mint)	60/40	90/10
8 (NM-Mint)	65/35	90/10
7 (Near Mint)	70/30	90/10
6 (EX-Mint)	80/20	90/10
5–4	85/15	90/10
3–1	90/10	90/10

Measured reality: we analyzed 104 PSA-graded 2025 Topps Chrome slabs to see how these thresholds are applied on a design with ambiguous reference points. See 2025 Topps Chrome Centering: What a PSA 10 Actually Requires.

BGS Centering Requirements

Beckett grades centering as its own subgrade, so a BGS slab tells you exactly how the grader scored centering. A BGS 10 centering subgrade (Pristine) requires essentially perfect front centering. Below BGS 5, the back is no longer held to a centering limit.

BGS centering subgrade	Front (max)	Back (max)
10 (Pristine)	50/50	55/45
9.5 (Gem Mint)	55/45	60/40
9 (Mint)	55/45	70/30
8 (NM-Mint)	60/40	80/20
7–6	65/35	90/10
5	75/25	95/5
4	80/20	No limit
3	85/15	No limit
2	90/10	No limit

Measured reality: Beckett's published standards leave the 10 / 9.5 / 9 boundaries vague, so we measured 155 BGS slabs to find where they actually fall. The observed front threshold is 52/48, not the published 50/50 and 55/45. See BGS Centering Requirements: What a 10, 9.5, and 9 Actually Take.

CGC Centering Requirements

CGC's scale includes a Pristine 10 above the standard Gem Mint 10. Centering alone does not separate a CGC 10 from a 9.5; both carry the same tolerance, and the difference comes from other factors.

CGC grade	Front (max)	Back (max)
Pristine 10	50/50	50/50
10–9.5 (Gem Mint / Mint+)	55/45	75/25
9 (Mint)	60/40	90/10
8.5–8	65/35	90/10
7	70/30	90/10
6	75/25	90/10
4.5	85/15	90/10
3.5	90/10	90/10

SGC Centering Requirements

SGC is unusual in holding the back nearly as strictly as the front at the top of the scale: an SGC 10 (Gem Mint) requires 55/45 on both sides, the tightest back requirement of any standard gem grade.

SGC grade	Front (max)	Back (max)
10 (Pristine)	50/50	50/50
10 (Gem Mint)	55/45	55/45
9.5 (Mint+)	55/45	60/40
9 (Mint)	60/40	60/40
8.5–8	65/35	65/35
7.5–7	70/30	70/30
6	75/25	75/25
5	80/20	80/20
4	85/15	85/15
3–2	90/10	90/10

TAG Centering Requirements

TAG publishes the most granular centering rubric of any service, with distinct thresholds at every half point. It is also the only major service that quantifies its Pristine tier at slightly above perfect (51/49 front).

TAG grade	Front (max)	Back (max)
10 (Pristine)	51/49	52/48
10 (Gem Mint)	55/45	65/35
9	60/40	75/25
8.5	62.5/37.5	85/15
8	65/35	95/5
7.5	67.5/32.5	95/5
7	70/30	95/5
6.5	72.5/27.5	95/5
6	75/25	95/5
5.5	77.5/22.5	95/5
5	80/20	95/5
4.5	82.5/17.5	95/5
4	85/15	95/5
3.5	87.5/12.5	95/5
3	90/10	95/5
2.5	92.5/7.5	95/5
2	95/5	95/5
1.5	98/2	98/2
1	99/1	99/1

ACE Centering Requirements

ACE has the most lenient top grade of the major services: a card at 60/40 on both sides still meets the ACE 10 centering threshold. That same 60/40 card would cap at PSA 9 or BGS 8.

ACE grade	Front (max)	Back (max)
10 (Gem Mint)	60/40	60/40
9	65/35	70/30
8–7	70/30	75/25
6–4	80/20	80/20
3–2	85/15	85/15

How to Measure Against These Thresholds

The margins that separate grades are small: the gap between a gem mint card and the next grade down is often a fraction of a millimeter of border. Eyeballing cannot resolve that, and rulers and calipers are impractical on a card you care about. Two things matter when measuring:

Measure both axes and judge the worst one. Graders evaluate left/right and top/bottom independently; a card that is 50/50 L/R and 58/42 T/B is a 58/42 card.
Eliminate perspective distortion. A photo taken at even a slight angle changes the apparent border widths and can move a measurement across a grade threshold. Either shoot perfectly flat or use a tool that corrects perspective before measuring.

For the full methodology, including how camera angle skews ratios, see How to Check Card Centering.

FAQ

What centering do you need for a PSA 10?

Up to 55/45 on the front and 75/25 on the back. A card at 60/40 on the front caps at PSA 9.

Is 60/40 centering bad?

It misses the gem mint threshold at PSA, BGS, CGC, SGC, and TAG, which all require 55/45 or better on the front. It still qualifies for strong grades (PSA 9, BGS 8, CGC 9) and meets the ACE 10 threshold.

Which grading company is strictest on centering?

For top grades, the Pristine designations (BGS 10, CGC Pristine 10, SGC 10 Pristine) require essentially perfect 50/50 centering. Among standard gem grades, SGC holds the back the tightest (55/45), while ACE is the most lenient overall.

Does back centering affect a card's grade?

Yes, but every service tolerates more on the back than the front. PSA and CGC allow 75/25 on the back for their top standard grade; SGC is the strictest at 55/45.

Sources & Notes

Note: These tables reflect each service's published standards as interpreted by Rectifi's grading engine. Where consecutive grades share a threshold, rows are merged (e.g. "7–6"). Graders apply professional judgment and eye appeal on borderline cards, and actual grading depends on corners, edges, and surface as well as centering. Use these thresholds to understand where a card stands, not as a guarantee of any grade.

Measure Your Card Against Every Threshold

Rectifi measures centering from any photo, corrects perspective automatically, and shows the grade each service's thresholds would allow. Free on iOS.