What is a pop report?

A population (pop) report is a grading company's count of how many copies of a specific card it has assigned each grade. PSA, BGS, and CGC each publish their own. It is the closest thing to a known supply figure for graded cards.

Why does the gem rate matter?

The gem rate is the share of all graded copies that achieved the top grade (PSA 10 or BGS 9.5/10). A low gem rate means the card is hard to grade perfectly, so high-grade copies are scarce and usually command a steep premium.

Does a small population guarantee high value?

No. A low population only matters if there is demand. A card nobody collects can have a tiny pop and still be cheap. Scarcity multiplies value only when paired with a desirable card and an active market.

How is cumulative share useful?

Cumulative share from the top down tells you how many copies grade at or above a given level. If only 5% of copies are PSA 10 but 30% are PSA 9 or better, you can judge how rare a true gem is versus a near-gem.

Should I trust pop reports as exact supply?

Treat them as a floor, not an exact count. Reports lag, exclude raw and ungraded copies, and cards can be cracked and resubmitted. They are a strong signal of relative scarcity but not a perfect inventory.

What is the TCG Card Pop Report & Market Math Calculator?

Enter the graded population by grade for a card to see the grade distribution, the percentage of copies in each tier, the cumulative share, and a scarcity ratio at the top grades. For Pokemon, MTG, and sports card investors. It runs free in your browser on Gera Tools, with nothing uploaded.

TCG Card Pop Report & Market Math Calculator

Name: TCG Card Pop Report & Market Math Calculator
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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A grading company’s population report is the best public proxy for how many copies of a card exist at each grade. This tool turns those raw counts into the percentages and scarcity ratios investors actually use to judge a card.

How it works

Given the population at each grade, the tool computes simple shares:

total       = sum of all grade counts
share[g]    = count[g] / total × 100
cumulative  = running total from the top grade downward
gem rate    = count[10] / total × 100
high-grade  = (count[10] + count[9]) / total × 100

The gem rate is the headline scarcity figure: a 3% gem rate means only three in every hundred graded copies reached the top grade.

Worked example

Suppose a card has 50 copies at PSA 10, 200 at PSA 9, 150 at PSA 8, and 100 spread across PSA 6-7, for a total of 500. The gem rate is 50 / 500 = 10%, and PSA 9-or-better is 250 / 500 = 50%. That combination — a moderate gem rate with a large near-gem pool — usually means PSA 10 copies trade at a large multiple over PSA 9. Always weigh these numbers against demand: scarcity without a market does not make money.

How to read the distribution strategically

The raw grade breakdown tells you several things beyond just how many PSA 10s exist:

The grade curve shape matters. A card where most copies cluster at PSA 8–9 with very few 10s suggests the card has surface-sensitive centering or printing issues that make a perfect grade rare. This often creates a steep PSA 10 premium. Contrast that with a card where the population is spread evenly across grades — there the premium for top grade tends to be smaller.

The high-grade ratio. The percentage of copies at PSA 9 or better combined (sometimes called the “high-grade rate”) tells you how many collectors have near-mint options. A very low high-grade rate means even PSA 9s carry a premium. A high rate (say 80%+ at 9 or better) suggests the card grades easily, which compresses premiums across all high grades.

Cumulative share as a pricing lever. Cumulative share from the top tells you what percentage of supply sits at or above a given grade. If only 15% of copies are PSA 9 or better, any collector wanting a high-grade copy is competing for a small pool, supporting price.

Limitations of pop report data

Pop reports are a useful signal but not a perfect inventory:

Lag. Data reflects cards graded and returned. Newly graded copies take time to appear.
Resubmissions. Collectors sometimes crack open lower-grade slabs and resubmit, hoping for a better result. This inflates total population figures over time.
Ungraded raw copies. A large number of raw (ungraded) copies may exist in collections and could enter the graded market at any time, suppressing future scarcity.
Demand is separate. A very low gem rate on a card nobody collects will not produce high prices. Scarcity only commands a premium when paired with active collector or investor demand for that specific card.