What are sports card comps?
Comps are completed sales used as comparison evidence. The strongest comps match the same player, year, set, card number, parallel, autograph or relic status, serial number, and condition or grade.
What do comparable sales actually say?
Enter completed sales for the same card. The calculator shows the median, average, observed range, and results worth reviewing before you estimate value.
Start with your completed salesComparable sale ruleMatch before math
Exact cardSimilar conditionRecent completed sale
Player name alone is not enough. Match year, set, card number, version, autograph or relic status, and grade.
A useful comp is a completed sale for the same card in similar condition
Asking prices are not completed sales. A lot containing several cards is usually not a clean comparison for one card. Enter the sale amount plus buyer-paid shipping so each row uses a consistent total.
Build a comparable-sale ledger
Use at least three sales. Exclude any row that is not a true match.
The example amounts are synthetic and demonstrate the math only. They are not prices for a real card.
Your analysis will appear here
Enter at least three completed sales, then choose Analyze these comps.
What the calculator does, and what it cannot know
Every result comes from the values you enter. Nothing is fetched, saved, or treated as verified market data.
- Median
- The middle included total after sorting from low to high.
- Observed range
- The lowest and highest included totals. It is not a forecast.
- Outlier check
- With four or more sales, totals outside 1.5 times the interquartile range are flagged for review but remain included.
- Collector responsibility
- Confirm card identity, condition, sale date, shipping, and whether the displayed amount was the final price.
Sports card comps questions
Should I use the average or median card price?
The median is often a useful starting point because one unusually high or low sale affects it less than the average. Collectors should still inspect every included sale and explain why it is comparable.
Does this calculator provide live card prices?
No. The calculator has no market-data feed. It performs arithmetic only on the completed-sale amounts entered by the visitor.
Does the calculator automatically remove outliers?
No. With at least four included sales, it flags totals outside the standard 1.5 times interquartile-range rule. The collector decides whether a sale is truly mismatched and should be excluded.
Educational tool only. This is not an appraisal or financial advice. Card prices, fees, demand, condition opinions, and completed-sale details can change or be reported incorrectly. Verify the exact card and each sale before making a decision.