# Sports Card Radar

> 24 free trading-card calculators that run entirely in the browser, plus the reference data behind them as open JSON. Published by Vast Flow, LLP, which makes Valdar, a card-scanning app for iOS and Android.

Everything here is free, keyless and takes no account. The tools transmit nothing: the arithmetic arrives with the page and runs on the reader’s device. There is one copy of that arithmetic, and the API and the MCP server import the same module, so a figure from a calculator and a figure from the API cannot disagree.

Reference values were read from their publishers on 2026-09-11; each row carries the URL it came from.
Licence: CC BY 4.0 — Reuse any of this, including commercially, with a link back to the page or endpoint it came from.

## Free tools

### What it is worth

- [Sports card value calculator: what recent sold prices actually say](https://sportscardradar.com/tools/card-value-calculator/): Median, trimmed mean, MAD-based outlier flags and a distribution-free confidence interval over a list of sold prices.
- [Card collection value calculator: what the whole box is worth](https://sportscardradar.com/tools/collection-value-calculator/): Collection totals, cost basis, unrealised gain and value concentration across a list of cards.
- [Sports card ROI calculator: total return, annualised, after fees](https://sportscardradar.com/tools/card-roi-calculator/): Total return, compound annual growth rate, doubling time and break-even price for a card held over a period.
- [Sports card inflation calculator: what an old card price is worth now](https://sportscardradar.com/tools/inflation-calculator/): Inflation adjustment between any two years from the BLS CPI-U annual average series, and the real return on a card over that period.
- [Graded card premium calculator: what each grade is worth over raw](https://sportscardradar.com/tools/grade-premium-calculator/): Grade multiples over raw, the step between consecutive grades, and which grade carries the largest premium.

### Grading

- [Card centering calculator: measure the borders, get the ratio and the grade cap](https://sportscardradar.com/tools/centering-calculator/): Centering ratio from border measurements on both axes, and the maximum grade permitted by each grading company’s published centering tolerance.
- [Card grading cost calculator: what a submission really costs per card](https://sportscardradar.com/tools/grading-cost-calculator/): Total and per-card cost of a grading submission across fees, tax, insurance, shipping, supplies, membership and declared-value upcharges.
- [Is this card worth grading? The expected value, grade by grade](https://sportscardradar.com/tools/grading-worth-it-calculator/): Expected value of grading one card against selling it raw, net of fees, with the break-even probability for the top grade.
- [Population report calculator: gem rate, scarcity and what “pop 12” means](https://sportscardradar.com/tools/pop-report-calculator/): Gem rate, per-grade share, cumulative share at or above a grade, and a difficulty band from a card’s graded population.
- [Crossover calculator: is moving a card to another grader worth the fee?](https://sportscardradar.com/tools/crossover-calculator/): Expected value of a crossover submission and the minimum success rate at which it beats keeping the current holder.
- [Which grading company should you use? Weight the criteria yourself](https://sportscardradar.com/tools/grader-chooser/): A weighted ranking of five grading companies across six collector-set criteria, with every per-criterion contribution shown.

### Selling

- [eBay fee calculator for trading cards: what you keep after every fee](https://sportscardradar.com/tools/ebay-fee-calculator/): Net proceeds and effective fee percentage on a marketplace sale, plus the break-even sale price for a given cost basis.
- [Where to sell sports cards: seven routes compared net of every fee](https://sportscardradar.com/tools/where-to-sell-calculator/): Net proceeds and days-to-cash for seven selling routes on the same card, ranked with the gap to the best route.
- [Card auction calculator: what winning costs and what consigning returns](https://sportscardradar.com/tools/auction-calculator/): Buyer total including premium, shipping and tax; maximum hammer bid for a budget; and consignor net after commission.
- [Sports card shipping calculator: PWE, tracked or insured, by card value](https://sportscardradar.com/tools/shipping-calculator/): True cost of each shipping method including expected loss, and the card value at which the ranking changes.
- [Card break-even calculator: the price a card has to fetch to get even](https://sportscardradar.com/tools/break-even-calculator/): Break-even sale price given cost basis, grading cost, shipping and marketplace fees, and the margin at any target price.

### Odds and rarity

- [Pack odds calculator: your real chance of pulling the card](https://sportscardradar.com/tools/pack-odds-calculator/): Probability of at least one hit, exactly none, and two or more, from stated pack odds; plus the packs needed for 50%, 90% and 99% confidence.
- [Serial numbered card calculator: how rare is a /99 parallel really?](https://sportscardradar.com/tools/print-run-calculator/): Print run arithmetic for serial-numbered parallels: copies in existence, share of the parallel run, scarcity tier and notable serial numbers.
- [Set completion calculator: what finishing the set will actually cost](https://sportscardradar.com/tools/set-completion-calculator/): Set completion percentage, cost to finish split between commons, short prints and key cards, and the share of the remaining cost in the tail.
- [Rookie card checker: is this really a rookie card, by sport and year](https://sportscardradar.com/tools/rookie-card-checker/): Whether a card meets the rookie-card convention for its sport and year, returning the rule that decided it.

### Reference

- [What the numbers on a sports card mean: a card back, decoded](https://sportscardradar.com/tools/card-back-decoder/): A reference map of the marks printed on a trading card, what each identifies and the common misreading of each.
- [Sports card era checker: what a card’s year says about its value](https://sportscardradar.com/tools/era-checker/): The production era a card belongs to and the supply, value and grading outlook for that era.
- [Card supplies calculator: what protecting a collection costs per card](https://sportscardradar.com/tools/supplies-calculator/): Supply counts and cost for a collection by size and protection level, with per-card cost.
- [Card collection insurance calculator: how much of it is actually covered](https://sportscardradar.com/tools/insurance-calculator/): Covered amount, uninsured gap, payout on a total loss and the annual cost of a rider covering the gap.

## Open data

- [API documentation](https://sportscardradar.com/api/): what every field means, and how to reuse it.
- [Published centering tolerances by grading company](https://sportscardradar.com/api/v1/grading-scales.json)
- [Trading card grading companies](https://sportscardradar.com/api/v1/graders.json)
- [Trading card production eras](https://sportscardradar.com/api/v1/eras.json)
- [Card anatomy and rookie-card conventions](https://sportscardradar.com/api/v1/card-reference.json)
- [Selling routes, shipping and auction structure](https://sportscardradar.com/api/v1/selling-routes.json)
- [US CPI-U annual averages](https://sportscardradar.com/api/v1/cpi.json)
- [What this site and the Valdar app do](https://sportscardradar.com/api/v1/product.json)
- [OpenAPI 3.1 description](https://sportscardradar.com/api/v1/openapi.json)
- [Dataset freshness](https://sportscardradar.com/api/v1/status.json)

Covers 3 published grading scales, 5 grading companies, 9 production eras and 113 years of US CPI-U (1913–2025, republished from the Bureau of Labor Statistics).

## Reading

- [Scouting reports](https://sportscardradar.com/scouting/): longer write-ups on card values, grading and market research.
- [Who publishes this](https://sportscardradar.com/story/)
- [Contact](https://sportscardradar.com/contact/)

## The app

Sports Card Scanner — Valdar identifies a card from one photograph, shows what that exact card has been selling for from eBay sold listings and third-party pricing databases, and estimates the four grading sub-dimensions. Free tier: Scan and identify cards, see market value estimates, start a collection. Premium is $3.99 a week or $29.99 a year.

What it does not do:
- It does not issue an official grade. Only PSA, BGS, SGC, CGC or TAG can do that; Valdar estimates the four sub-dimensions so the submission decision can be made before the fee is paid.
- It does not buy, sell or consign cards, and takes no commission on any transaction.
- It does not guarantee a sale price. A value estimate is a reading of past sold listings, not an offer.
- It is not a grading-company product and is not affiliated with PSA, BGS, SGC, CGC, eBay, Topps, Panini or Upper Deck.

## For agents

- Every page has a markdown twin: append `index.md` to any URL, or send `Accept: text/markdown`.
- [Full text of the tools and reference pages](https://sportscardradar.com/llms-full.txt)
- [MCP server card](https://sportscardradar.com/.well-known/mcp/server-card.json) — read-only tools over the data above.
- [A2A agent card](https://sportscardradar.com/.well-known/agent-card.json)
- [Agent skills](https://sportscardradar.com/.well-known/agent-skills/index.json)
- [Access and authentication](https://sportscardradar.com/auth.md) — there is none, and that document says so precisely.