| First Folio by William Shakespeare |
$9,978,000 |
October 2020 |
Christie's |
| Bay Psalm Book (1640) |
$14,165,000 |
November 2013 |
Sotheby's |
| Birds of America by John James Audubon |
$8,802,500 |
December 2010 |
Sotheby's |
| First Edition of Pride and Prejudice |
$180,000 |
June 2019 |
Bonhams |
</tbody>
</table>
Many library systems provide excellent resources for researching book values. The Enoch Pratt Free Library in Baltimore, for example, maintains a dedicated guide to evaluating old books that outlines methods and resources for book valuation.
Reference Library Collections
Most major public libraries maintain reference collections that include specialized resources such as:
- Book Collector’s Price Guide - Annual publication with current market values
- American Book Prices Current - Records of auction sales
- Bookman’s Price Index - Compilation of dealer catalogs
Special Collections Librarians
Special collections librarians at academic libraries often have expertise in rare books and can provide valuable insights. While they typically cannot offer formal appraisals due to ethical guidelines, they can:
- Help identify edition points
- Suggest appropriate reference materials
- Direct you to reputable appraisers if needed
- Offer historical context for your book
Library Databases
Many libraries provide free access to specialized databases that can assist with book research:
- WorldCat - Helps determine rarity by showing institutional holdings
- HathiTrust Digital Library - Historical publishing information
- JSTOR - Scholarly articles on book history and collecting

Technology has made book valuation more accessible than ever, with numerous apps and digital tools designed to help identify and value books.
BookScouter
BookScouter offers a free app that compares book prices across multiple vendors. While primarily designed for textbooks, it can provide useful data points for more common antiquarian books by:
- Scanning ISBN codes (for books published after 1970)
- Comparing current selling prices across 30+ vendors
- Tracking price history over time
MyBookWorth
A recently developed tool mentioned in the Reddit Old Books community, MyBookWorth.com allows users to search for book values by title, image, or even photos of multiple books.
Library Apps with Authentication Features
Some library systems provide access to specialized authentication and valuation databases through their apps, including:
- OCLC FirstSearch
- Rare Book Transaction History
- Heritage Auction Archives
When evaluating books using digital tools, remember:
- Most apps work best for books published after ISBN adoption (1970s)
- Apps typically provide retail prices, not what you could sell for
- Condition assessment requires human judgment, not algorithms
- Very rare or unique books rarely have accurate digital valuations
Free valuation methods have limitations. Consider professional appraisal services in these circumstances:
Indicators That Suggest Professional Appraisal
- High-Value Indicators - If your research suggests a book could be worth over $1,000
- Insurance Requirements - When documentation is needed for insurance coverage
- Estate Settlement - For tax and legal purposes during estate distribution
- Auction Consignment - When preparing to sell through reputable auction houses
- Authenticity Questions - If you suspect a book might be particularly rare or valuable
Free Evaluation Services
Some institutions and dealers offer free initial evaluations:
- Rare Book Buyer provides free evaluations and can make immediate cash offers
- Major auction houses like Christie’s and Sotheby’s offer free initial consultations for potential auction items
- Some rare book dealers will provide free verbal appraisals as a service to potential sellers
Professional Appraisal Options
When seeking professional appraisal, consider these options:
- Certified Appraisers - Members of the Antiquarian Booksellers’ Association of America (ABAA)
- Auction House Specialists - Experts at major auction houses with book departments
- Independent Book Specialists - Appraisers specializing in specific genres or periods
Professional Appraisal Resources
Proper preservation can maintain or even enhance the value of your antique books. Follow these guidelines to protect your investment:
Environmental Controls
The environment significantly impacts book preservation:
- Temperature - Maintain consistent temperature between 65-70°F (18-21°C)
- Humidity - Keep relative humidity between 30-50%
- Light Exposure - Minimize exposure to direct sunlight and UV light
- Air Quality - Ensure good air circulation and avoid pollutants
Handling Practices
Proper handling prevents damage:
- Clean Hands - Always handle books with clean, dry hands
- Support - Use book cradles for fragile bindings
- Page Turning - Turn pages carefully from corners
- Bookmarks - Never use adhesive notes or metal bookmarks
Storage Solutions
How and where you store books matters:
- Shelving - Store upright on sturdy shelves with supports if needed
- Dust Jackets - Protect with archival-quality covers
- Boxes - Use acid-free boxes for fragile items
- Location - Avoid basement and attic storage
Book Preservation Checklist
Essential steps to maintain book condition and value
For particularly valuable books, consider consulting a professional conservator for personalized preservation advice.
Common Questions About Free Antique Book Valuation
How do I find out what my old books are worth for free?
You can determine the approximate value of your old books for free by:
- Searching for similar copies on marketplaces like AbeBooks.com and comparing prices
- Using library resources including reference books on antiquarian books
- Consulting online databases like ViaLibri which searches across 170+ websites
- Visiting public libraries where reference librarians can direct you to valuation resources
- Using apps like BookScouter (primarily for books with ISBNs)
Remember that these methods provide estimates rather than definitive valuations, but they’re excellent starting points.
At what age is a book considered an antique?
By traditional definition, a book is considered an antique when it is at least 100 years old. Books that are younger than 100 years but older than 50 years are typically classified as "vintage" rather than antique.
However, some exceptionally important or rare books may be highly valuable despite not meeting the 100-year threshold. First editions of important literary works, for example, can be valuable regardless of age.
Is there an app that tells you how much a book is worth?
Yes, several apps can help determine book values, though their accuracy varies:
- BookScouter: Compares prices from 30+ vendors buying and selling books
- AbeBooks: Has a mobile app to search their marketplace
- BookFinder: Searches multiple marketplaces for comparative pricing
- MyBookWorth: A newer tool that allows searching by title, image, or photos
These apps work best for books published after the 1970s (when ISBN numbers became standard). For older or rarer books, traditional research methods typically provide more accurate valuations.
How do I know if I have a first edition book?
Identifying first editions can be complex as publishers use different methods to indicate them:
-
Look for a statement directly indicating "First Edition," "First Printing," or "First Published"
-
Check the number line on the copyright page - if it includes "1" or starts with "1," it’s typically a first edition
-
Compare publication date on title page with copyright date - they should match for first editions
-
Research publisher-specific practices, as each has unique methods
-
Absence of references to additional printings or editions
For valuable books, consult a reference guide specific to the publisher or a professional dealer for confirmation.
What makes an old book valuable?
Several factors determine the value of an old book:
-
Rarity: How many copies exist and how difficult they are to find
-
Condition: Physical state from poor to fine/mint (condition can impact value by 50-90%)
-
Demand: Level of collector interest in the title or author
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First Edition Status: First editions of important works are typically most valuable
-
Provenance: History of ownership, especially if previously owned by someone notable
-
Completeness: All pages, illustrations, maps, and original components present
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Dust Jacket: For books published after 1920, an intact original dust jacket can increase value by 50-80%
-
Signatures/Inscriptions: Authenticated author signatures can significantly increase value
A book with multiple positive factors will command the highest prices.
Where can I get my books appraised for free?
Several options exist for free book appraisals:
-
Public Libraries: Many reference departments have resources for book valuation
-
Online Marketplaces: Research similar copies on AbeBooks, Biblio, or ViaLibri
-
Rare Book Dealers: Some offer free initial evaluations in hopes of future business
-
Auction Houses: Major houses like Christie’s and Sotheby’s provide free initial consultations for potential auction items
-
Book Fairs: Dealers at antiquarian book fairs often provide informal appraisals
-
Online Forums: Communities like r/rarebooks on Reddit where experts may offer opinions
Remember that free appraisals are typically informal and may not be suitable for insurance or legal purposes, which usually require paid professional appraisals.
Valuing antique books is both an art and a science. While free resources can provide excellent starting points and reasonable estimates, remember that they have limitations. For books of significant value or for official documentation, professional appraisal services remain the gold standard.
The journey of discovering your books’ value can be rewarding in itself. Beyond potential monetary worth, you’ll gain a deeper appreciation for the historical and cultural significance of your collection.
We encourage you to:
- Start with the free resources outlined in this guide
- Document your findings carefully, including comparable sales
- Take proper preservation steps for books that appear valuable
- Consult professionals when circumstances warrant expert opinions
- Join book collecting communities to expand your knowledge
Whether your old books turn out to be hidden treasures or beloved personal keepsakes, understanding their value adds a new dimension to your relationship with these tangible pieces of history.
Additional Resources for Antique Book Valuation
The world of antique books is vast and fascinating. Whether you’re a casual inheritor of old volumes or an aspiring collector, the resources in this guide will help you navigate the process of discovering what your books are truly worth—all without spending a dime.