One Piece Collection Value Calculator
What is your One Piece Card Game collection actually worth? Every card and sealed product priced at its own market value, updated daily.
Adding it up by hand is worse than you think
Valuing a One Piece collection card by card is a bad evening. Even a modest binder is a few hundred lines, every line needs the right printing looked up, and the answer is stale within a week because the market kept moving after you closed the tab. Do it twice and you will not do it a third time.
The calculator here removes the lookup step entirely. Mark what you own once, and the valuation is computed from market prices that resync every day. The total you see on a Tuesday in November reflects Tuesday in November, not the afternoon you happened to build a spreadsheet.
It matters most for exactly the collections that are hardest to value manually: the ones with a lot of parallels, alternate arts and sealed product, where the difference between a naive count and a proper per-printing valuation can be several hundred dollars in either direction.
How to value your collection
- 1
Sign in with Discord
The calculator prices the cards you own, so it needs to know which ones those are. Holdings are saved to your account.
- 2
Mark what you own
Set an owned quantity on each card, choosing the right variant. Sealed boxes, packs, decks and DON!! cards can be added the same way and count toward the total.
- 3
Optionally enter what you paid
Add a cost basis to any holding and the calculator starts reporting gain or loss beside current value.
- 4
Read the total
The dashboard totals every holding at its own current market price, and shows how that figure moved over the last 7 and 30 days.
- 5
Come back whenever
Prices resync daily, so the number is current on your next visit with no re-entry and no manual refresh.
The math, stated plainly
There is nothing clever hiding in the total. Every figure on the dashboard comes from these four rules.
- Line value
- quantity owned multiplied by that printing's market price
- Collection value
- the sum of every line value, singles and sealed together
- Gain or loss
- current value minus the cost basis you recorded, where you recorded one
- 7 and 30 day change
- today's collection value compared against a stored snapshot from that many days ago
Where the price data comes from
Prices are market prices, synced once a day. Market price is used rather than the lowest listing because it is derived from completed sales, which makes it the more honest input to a valuation. A single underpriced listing does not drag your whole collection total down, and an optimistic one does not inflate it.
Each printing is matched to its own priced product, including foil parallels, alternate art promos and later reprints. That per-variant matching is the part that makes the total trustworthy: valuing a foil parallel at the base print's price, or the other way around, is the single biggest source of error in homemade collection spreadsheets.
The honest limits: values cover ungraded English cards and sealed product, condition is not modelled, graded slabs are out of scope, and Japanese cards have no price series behind them. The number is a good running estimate of what the collection is worth on the open market, not a formal appraisal.
One Piece collection value questions
How is my One Piece collection value calculated?
Each holding is valued as your quantity multiplied by that exact printing's current market price, and those line values are summed. Foils, alternate arts and reprints are priced against their own product rather than a shared card number, and sealed products and DON!! cards are valued the same way and included in the total.
What price does it use - low, market or high?
Market price. That figure is derived from what copies have actually been selling for, which is a far better estimate of what your collection would realise than the lowest asking price on an unsold listing.
How often is the value updated?
Once a day. Prices are pulled from a daily sales data feed, so your total refreshes automatically without you re-entering anything.
Can I see profit and loss, not just current value?
Yes, if you record what you paid. Each holding has an optional cost basis field, and where it is filled in the calculator shows the unrealized gain or loss on that card and folds it into a collection-wide figure.
Do I need an account to calculate my collection value?
Yes, because the calculator values the specific cards you have marked as owned, and those holdings live on your account. Sign-in is with Discord. If you only want to price a handful of cards, every card page shows its current market price and price history without any account.
Does it value graded cards?
No. Values are for ungraded, near-mint English singles and sealed product, which is what the underlying market price data covers. A slabbed copy is worth something quite different and is not modelled here.
Are Japanese cards valued?
No. You can track Japanese cards in your collection, but the price data behind the calculator covers the English print run, so Japanese holdings carry no market value.
Is this an appraisal?
No. It is an estimate built from public market data, and it is only as accurate as that data and as your own record of what you own. Treat it as a running estimate for your own planning, not as a valuation for insurance or a sale.
Does it cost anything to use?
No. Valuation, tracking, price history and price alerts are all free, with no card limit.
Find out what it is worth
Sign in with Discord, mark what you own, and read the total. It keeps itself current after that.
Calculate my collection value