What are Population Reports and Why Do They Matter?
The most underused free tool in the hobby
PSA's population report is publicly available, free, and updated in near-real-time. It tells you exactly how many copies of any graded card exist at every grade level. From this single data source, you can calculate gem rates, identify overgraded cards, spot undervalued rarity, and make dramatically better buying decisions.
Most collectors check eBay comps before buying. Fewer check the population report. The ones who do have a consistent information edge.
How to access the pop report
Go to psacard.com/pop. You can search by:
- Player name
- Set name and year
- PSA certification number (on the label of a graded card)
The search returns a grade distribution table showing the count of graded copies at each grade level from 1 through 10, plus Authentic and qualifier designations.
Reading the grade distribution table
The table looks like this (example — fictional numbers for illustration):
| Grade | Population |
|---|---|
| PSA 10 | 42 |
| PSA 9 | 318 |
| PSA 8 | 891 |
| PSA 7 | 1,204 |
| PSA 6 and below | 2,890 |
| Total | 5,345 |
From this table, you can derive several key metrics:
Calculating gem rate
Gem Rate = PSA 10 count ÷ Total Graded × 100
In the example above: 42 ÷ 5,345 = 0.79% gem rate
This means fewer than 1 in 100 submitted copies achieved a PSA 10. This is a condition-scarce card. For context:
- Gem rate above 30% = easily achievable; PSA 10 is the expected outcome of submitting a well-kept copy
- Gem rate 5–30% = moderately condition-sensitive; careful selection needed
- Gem rate 1–5% = genuinely condition-scarce; PSA 10 requires an exceptional copy
- Gem rate below 1% = holy grail territory; PSA 10s are historically significant finds
The 10-to-9 ratio: a secondary signal
Divide PSA 10 count by PSA 9 count: 42 ÷ 318 = 0.13 ratio (roughly 1 PSA 10 per 7.5 PSA 9s)
A healthy grading set (modern chrome, well-produced) typically shows a 10-to-9 ratio above 1.0 — more 10s than 9s. When this ratio is very low, it signals that many copies are close to 10 quality but not achieving it — suggesting a production or condition challenge that makes the 10 genuinely hard.
Compare this to modern Prizm: you might see 10-to-9 ratios of 2.0–4.0, meaning PSA 10s are 2–4x more common than PSA 9s. The grading curve is inverted — most good copies grade 10.
Identifying undervalued rarity patterns
The "newly discovered" card: When a card's PSA 10 population is very low (under 50) but the card has not yet been widely discussed in the hobby, you have an arbitrage window. Search for these by browsing vintage set pop reports and looking for Hall of Famers with unexpectedly low PSA 10 populations.
The "recently graded" surge: If a card's total population jumped significantly in the past 6–12 months (PSA shows submission volume trends), it may mean a bulk submission arrived, increasing supply and potentially softening prices. Watch for population growth relative to price.
The "stable classic": A card where the PSA 10 population has barely moved in 3–4 years and the card has been available for decades. This is the most reliable signal of fixed, finite supply. The Jordan 1986 Fleer sits here — well-documented, stable population, predictable market.
Putting it together before a purchase
Before buying any graded or raw card intended for grading, spend 3 minutes on the pop report:
- Look up the card
- Calculate gem rate
- Check 10-to-9 ratio
- Note total population trajectory
If gem rate is above 30%, the PSA 10 is supply-abundant — value is a pure player bet. If gem rate is below 5%, you have condition scarcity supporting the valuation. Price accordingly.
The Pop Report Tracker spreadsheet pre-loads population data for 100 key basketball and football cards and auto-calculates gem rates — get it here.