BGS Subgrade Calculator
Enter your four Beckett subgrades to instantly calculate the overall BGS grade. See what-if scenarios to find which subgrade is holding your card back, plus value multipliers and PSA equivalents.
Quick Presets
Subgrades
Overall Grade
“What If” Scenarios
Centering at 9.0 is your weakest subgrade and the most likely to hold your overall grade back.
If Centering were 9.5 instead of 9.0
Overall: BGS 9 (Mint)
If Corners were 9.5 instead of 9.0
Overall: BGS 9 (Mint)
If Edges were 9.5 instead of 9.0
Overall: BGS 9 (Mint)
If Surface were 9.5 instead of 9.0
Overall: BGS 9 (Mint)
Show downgrade scenarios
If Centering dropped to 8.5 from 9.0
Overall: BGS 9 (Mint)
If Corners dropped to 8.5 from 9.0
Overall: BGS 9 (Mint)
If Edges dropped to 8.5 from 9.0
Overall: BGS 9 (Mint)
If Surface dropped to 8.5 from 9.0
Overall: BGS 9 (Mint)
Grade Value Impact
| Grade | Value Multiplier |
|---|---|
| BGS 10Pristine | 10-20x raw value |
| BGS 9.5Gem Mint | 3-5x raw value |
| BGS 9Mint | 1.5-2.5x raw value |
| BGS 8.5NM-MT+ | 1.2-1.5x raw value |
| BGS 8NM-MT | 1-1.2x raw value |
| BGS 7 and belowNM or lower | 0.5-1x raw value |
BGS vs PSA Comparison
| BGS Grade | PSA Equivalent |
|---|---|
| BGS 6.5EX-MT+ | PSA 6-7 |
| BGS 7.5NM+ | PSA 7-8 |
| BGS 8.5NM-MT+ | PSA 8-9 |
| BGS 9.5Gem Mint | PSA 10 (Gem Mint) |
| BGS 10Pristine | PSA 10 (Gem Mint) |
| BGS 9Mint | PSA 9 (Mint) |
| BGS 8NM-MT | PSA 8 (NM-MT) |
| BGS 7NM | PSA 7 (NM) |
| BGS 6EX-MT | PSA 6 (EX-MT) |
BGS Subgrade Tips
Centering is the most common limiter
Centering is the easiest subgrade to check before submitting. Use a centering tool to measure 60/40 or better front and back. Cards with visible off-center cuts are almost guaranteed to lose at least 0.5 here.
Surface scratches are hard to spot
Use a bright LED light at an angle to reveal micro-scratches on the surface. Foil and chrome cards are especially prone to surface issues. Even factory-fresh cards can have print lines that BGS counts against surface.
Corners and edges compound each other
A dinged corner usually means the edge took damage too. Check all four corners under magnification. BGS graders use 10x loupes and are extremely strict on modern cards.
BGS 9.5 is the sweet spot for value
The jump from BGS 9 to BGS 9.5 is often a 2-3x value increase, while BGS 9.5 to BGS 10 can be 3-5x more. For most cards, a BGS 9.5 offers the best return on investment for grading costs.
Frequently Asked Questions
How does BGS calculate the overall grade from subgrades?
BGS takes the simple average of all four subgrades (Centering, Corners, Edges, and Surface) and rounds to the nearest half-grade using specific thresholds. For example, an average of 9.375 or higher earns a BGS 9.5 Gem Mint. However, there is a cap rule: no subgrade can be more than 1.0 below the overall grade, so a single weak subgrade can limit your final result.
What subgrade combination gives a BGS 10 Pristine?
To achieve a BGS 10 Pristine, the average of all four subgrades must be 9.875 or higher. The only combinations that work are all four at 10, or three at 10 and one at 9.5 (average = 9.875). You cannot get a BGS 10 with any subgrade below 9.5 due to the cap rule.
What is the BGS cap rule for subgrades?
The cap rule states that no subgrade can be more than 1.0 below the overall grade. For instance, if you have subgrades of 10, 10, 10, and 8, the average would be 9.5, but the 8.0 subgrade limits the overall to BGS 9 because 8.0 is more than 1.0 below 9.5. This rule prevents cards with one severely weak area from getting a high overall grade.
Is a BGS 9.5 the same as a PSA 10?
A BGS 9.5 Gem Mint is generally considered comparable to a PSA 10 Gem Mint in terms of card quality. However, the market typically values PSA 10s slightly higher for most modern cards due to PSA brand recognition. A BGS 10 Pristine (also called "Black Label" when all four subgrades are 10) is considered superior to a PSA 10 and commands significant premiums.
Which BGS subgrade is most commonly the lowest?
Centering is the most commonly limited subgrade because it is affected by the card manufacturer cutting process, which collectors cannot control. Off-center cuts are easy to spot and consistently result in a lower Centering subgrade. Surface is the second most common limiter, especially on foil, chrome, and refractor cards that show micro-scratches under magnification.