A single standard postage stamp typically covers one ounce of mail. This applies to standard-sized envelopes and letters. Exceeding this weight requires additional postage, calculated based on the excess weight and mail... Read more »
The value of a single postage stamp dictates the maximum weight and sometimes the type of mail it can frank. For example, a standard Forever stamp in the United States currently covers... Read more »
A “Forever” stamp is designed to cover the cost of First-Class Mail postage for a standard one-ounce letter, regardless of any subsequent price increases. If a letter weighs more than one ounce... Read more »