Rare book value estimator
What is my book worth?
Get a starting estimate of your book’s collector value. Describe the title, author, edition, condition, and any signatures, or use book photos to help fill in the details. Review the information before estimating.
Book photos (optional)
Add a clear barcode or copyright-page photo to help fill in book details. Add a title-page photo if needed. Review everything before pricing.
Choose up to 3 photos together, 10 MB each. JPEG, PNG, or WebP. For barcodes, include the printed ISBN digits.
Selecting Read book details sends these photos to OpenAI for processing. Upload only book pages you want processed.
Optional: add photos to help fill in book details.
Review details from photos
Select each detail you want to use. Selected values replace the corresponding fields. Edition and printing wording is appended to notes.
How to estimate the value of an old or rare book
Start by identifying the exact copy you have. A title alone does not tell the whole story: edition, printing, condition, and distinctive features help determine which other copies are useful comparisons.
Check the edition and printing
Record the publisher, publication date, edition statement, and number line where present. A first edition may have several printings. Identification conventions vary by publisher, so include the wording you see rather than guessing.
Describe condition and the dust jacket separately
Note loose pages, stains, annotations, repairs, missing illustrations, and binding wear. If a dust jacket is present, describe its condition and whether it is original or a reproduction. Photographs of the title and copyright pages can help you record the details.
Record signatures and ownership history
Distinguish an author’s signature from a previous owner’s name or a gift inscription. Record any evidence of notable ownership. An automated estimate does not authenticate a signature or establish provenance.
Compare asking prices with completed sales
An asking price is what a seller hopes to receive; a completed sale records a transaction. Neither is a useful comparison unless the edition, condition, and other important details are similar. Check sale dates, currencies, and whether auction figures include buyer’s fees. Do not treat a listed price as a confirmed sale.
Understand your RareBooks.ai estimate
The advisor uses the details you provide and returns available comparison information. Review the match and price-evidence labels alongside the result. If matching data is unavailable, the tool may show a clearly labelled fallback based on general book characteristics. That fallback is less specific to your copy.
The result is a starting point for research, not an offer to buy, a guaranteed selling price, or a formal appraisal. For a potentially important copy, seek a specialist who can examine the book and its supporting evidence.
Are old books always valuable?
No. Age alone does not establish value. Collector demand, scarcity, condition, and the significance of a particular edition or copy all matter.
Can I estimate a book without an ISBN?
Yes. The ISBN field is optional. Enter the title, author, publisher, year, and identifying details. Check any details suggested from photographs before using them.
Explore related collections
Further reading: the Antiquarian Booksellers’ Association of America’s guide to evaluating books and introduction to identifying first editions.