Acceptable letter mail size

The acceptable size for a letter mail piece in the United States is as follows:

• Length: Up to 11.5 inches (29.2 cm)
• Height: Up to 6.125 inches (15.6 cm)
• Thickness: Up to 0.75 inches (1.9 cm)

These dimensions are specified by the United States Postal Service (USPS) and are designed to ensure that letter mail pieces can be easily processed and delivered.

It's worth noting that there are some exceptions to these size limits. For example:

• Postcards: Postcards can be up to 4.5 inches (11.4 cm) wide and 6 inches (15.2 cm) high.
• International letters: Letters sent to international destinations may have slightly different size limits, depending on the country of destination.
• Oversized letters: If a letter is larger than the standard size limits, it may be considered an oversized letter and may require additional postage.

It's always a good idea to check with the USPS or a postal service representative if you're unsure about the size of your letter mail piece.