What is the minimum letter-size to mail?

Understanding Mail Dimensions: The Minimum Letter Size for Mailing

When sending mail, it’s essential to comply with specific dimensions to ensure proper postage and timely delivery. The United States Postal Service (USPS) has established guidelines that determine the minimum and maximum sizes for mail pieces.

Minimum Letter Size

The minimum size for a letter to be mailed is 3.5 inches in height by 5 inches in length. This dimension ensures that the letter meets the guidelines for proper handling and sorting within the postal system.

Thickness

The thickness of the letter should be at least 0.007 inches. This provides structural stability and prevents damage during transit.

Maximum Letter Size

The maximum size for a letter is 6.125 inches in height by 11.5 inches in length. Exceeding these dimensions may incur additional postage fees or result in the mail piece being considered an oversized envelope.

Specific Dimensions

The specific dimensions are crucial for proper postage. The USPS calculates postage based on the size and weight of the mail piece. Incorrect dimensions can lead to insufficient postage, resulting in delayed delivery or return to sender.

Additional Considerations

In addition to the minimum and maximum dimensions, there are other factors to consider when mailing letters:

• Shape: Mailers must be rectangular, with corners no more than 0.5 inches thick.
• Flexibility: Letters should be flexible enough to be processed through automated equipment.
• Adhesive: Use strong adhesive to secure the letter closed to prevent it from opening during transit.

By adhering to the minimum and maximum letter sizes, as well as the other USPS guidelines, you can ensure that your mail reaches its destination efficiently and at the appropriate postage rate.