How Many Sheets of Paper Fit in a 1 Ounce Envelope for Mailing Purposes?

Typically speaking, using regular notebook paper and a single envelope, 4 to 5 sheets of paper can be mailed while staying under 1 ounce. The United States Postal Service charges one stamp per ounce for letters. Using heavier paper or a thicker envelope will result in a much higher weight, which means less sheets of paper can be mailed using only one stamp.