First Class Mail Weight and Size Specifications

First Class Mail is a popular and economical option for sending various types of mail within the United States. To ensure your mail qualifies for First Class status and to understand its weight and size specifications, it's important to familiarize yourself with the guidelines set by the United States Postal Service (USPS).

Weight Specifications:

• For letters: The maximum weight for First Class Mail letters is 3.5 ounces.
  
• For large envelopes (flats): The maximum weight for First Class Mail large envelopes (flats) is 13 ounces.
• For packages: First Class Mail packages must not exceed 15.99 ounces in weight.
  

Size Specifications:

• Letters:
  • Minimum size: 3.5 inches high x 5 inches long x 0.007 inches thick.
  • Maximum size: 6-1/8 inches high x 11-1/2 inches long x 1/4 inch thick.
• Large Envelopes (Flats):
  • Minimum size: At least 6-1/8 inches high x 11-1/2 inches long x 1/4 inch thick.
  • Maximum size: 12 inches high x 15 inches long x 3/4 inch thick.
• Packages:
  • Packages must not exceed 15.99 ounces in weight.
    
  • Maximum combined length and girth (distance around the thickest part) is 108 inches.
    

It's important to adhere to these weight and size specifications to ensure that your mail is processed and delivered efficiently as First Class Mail.

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