Things You'll Need
Instructions
Learn important characteristics on stamps that help determine the value before you look up individual stamps. For instance, the stamp grade is an evaluation of how centered the stamp design is inside its margins. The stamp grade is an essential element in determining the stamp value.
Look at the stamp for other characteristics that determine value. For example, the condition of the perforation around the stamp, the amount or kind of glue on the back, the degree of cancellation (marking on the stamp once it has been used), the stamp's material and condition are all important elements that you will need to know before you look up stamps to find their value.
Obtain the Scott Standard Postage Stamp Catalogue. This book contains a list of stamp values and categories. Borrow a copy from your local library or purchase one at a bookstore or online at a website such as Amazon.com.
Find websites that allow you to look up individual stamps to determine their value. You can search by theme, color, date or value. Websites include Find Your Stamp Value.com and Stamp Catalogue.org.
Look in a local phone book or directory to find a stamp dealer or antique expert in your area who can assess individual stamps and appraise them to find their current market value. Stamp collectors are known as philatelists and can often help you find respected dealers in the area.