What is the extra postage required for a 6 inch by 6 inch Greeting card?

Answer 1

Letter

Dimension Minimum Maximum

Height 3-1/2 inches 6-1/8 inches

Length 5 inches 11-1/2 inches

Thickness 0.007 inch 1/4 inch

Any item smaller than the minimum dimensions is not mailable.

For larger items, see large envelopes or packages.

For envelopes, length is the dimension parallel to the address.

For items over 3.5 ounces, see large envelope or package prices.

Letters that meet one or more of the nonmachinable characteristics below are subject to the nonmachinable surcharge.

It is a square letter

It is too rigid -- does not bend easily

It has clasps, string, buttons, or similar closure devices

It has an address parallel to the shorter dimension of the letter

It contains items such as pens that cause the surface to be uneven

The length divided by height is less than 1.3 or more than 2.5

Square Envelope

The minimum size for a square envelope is 5" x 5".

Square letters are subject to the nonmachinable surcharge.

Answer 2

The 6x7 greeting cards are large. The cards only require a single stamp, so you will not need to add any additional postage.