First class mail letter weight

In the United States, the weight limit for a First-Class Mail letter is 3.5 ounces (99 grams). This means that a letter can weigh up to 3.5 ounces and still be sent as First-Class Mail.

Here are some examples of items that can be sent as First-Class Mail letters:

• A standard #10 envelope with a letter or a few pages of paper (up to 3.5 ounces)
• A greeting card with a message or a small gift (up to 3.5 ounces)
• A small package or gift wrapped in paper or plastic (up to 3.5 ounces)

However, if your letter weighs more than 3.5 ounces, you will need to use a different type of mail service, such as Priority Mail or Parcel Post.