What is the standard size for postcards?
Table of Contents
At least 3-1/2 inches high x 5 inches long x 0.007 inch thick. No more than 4-1/4 inches high x 6 inches long x 0.016 inches thick.
What is the aspect ratio for mailing?

between 1.3 and 2.5
The aspect ratio is the length of the mailpiece divided by the height. For a letter-size piece to be machinable, this number must be between 1.3 and 2.5, inclusive. This ensures that the mailpiece travels properly on USPS machinery. Pieces that are too tall relative to their length tend to tumble during processing.
What size is a large card for posting?
Large Letter Size Royal Mail large letters have a maximum length of 353mm, a maximum width of 250mm with thickness up to 25mm and a weight no more than 750g.
What size is a standard postcard UK?
148mm x 105mm
The standard postcard size in the UK is 148mm x 105mm (14.8 cm x 10.5cm) which is the equivalent of A6.

Do postcards need to be landscape?
Your postcard can be either landscape or portrait orientation. One thing you do need to be aware of is that the back of your card still needs to follow U.S. Postal Service mailing requirements (explained in the next section). If your postcards don’t follow USPS® dimension specifications, your mailing costs will go up.
Is A5 postcard size?
The A5 Postcard size is 5.83″ x 8.27″.
How do I size a postcard photo?
Photo postcards are typically rectangular, at least 3-1/2 inches high x 5 inches long x 0.007 inches thick and no more than 4-1/4 inches high x 6 inches long x 0.016 inches thick. This makes them close to 4 x 6, or qualified postcard size.
Does aspect ratio apply to all mail pieces?
Piece size can be no larger than 12” x 15” and no thicker than 0.75”. Additional design features to note: Piece weight can be no heavier than 13 ounces (FCM) or 16 ounces (Standard/Marketing Mail). There is no aspect ratio requirement.
What is the standard size of a postcard?
Shape: rectangular. Aspect ratio (length divided by height): 1.3 to 2.5 ( 201.3.7 ). Minimum: 5 inches long, 3-1/2 inches high, and 0.007 inch thick. For letter-size and postcard pieces 0.009 inch thick if more than 4-1/4 inches high or 6 inches long, or both.
What is the aspect ratio of a business card?
The aspect ratio is simply a number calculated by taking the length of your mail piece and dividing it by the height. The length of the card is the side that is parallel to the addressee’s name.
What is the aspect ratio of a letter size?
The aspect ratio is the length of the mailpiece divided by the height. For a letter-size piece to be machinable, this number must be between 1.3 and 2.5, inclusive. This ensures that the mailpiece travels properly on USPS machinery. Pieces that are too tall relative to their length tend to tumble during processing. See Exhibit 1-2.3.
What is the aspect ratio of a standard envelope?
It has an aspect ratio (length divided by height) of less than 1.3 or more than 2.5 (a square envelope has an aspect ratio of 1, making it nonmachinable). It is more than 4-1/4 inches high or more than 6 inches long and is less than 0.009 inch thick.