Postcard Size in Centimeters

Traditionally, postcards are printed on a standard A6 paper. The dimensions of this postcard are 148 mm x 105 mm (that's 5.8 in x 4.1 in). The United States Postal Service has set minimum and maximum sizes for the A6 card, which means it must be between three and six centimeters (0.9 inches and one inch) in length. According to the UPU, the aspect ratio of a postcard should be 2:1, but if the postcard is wider or thinner than the A6 size, it is not allowed to be wider or shorter than the minimum and maximum dimensions.
The modern standard for postcards is 6 1/2 x 4 3/4 inches (14 cm x 10.5 inches). It's the most common postcard size, but the traditional size is more than twice as large. In the United States, these cards are classified as "oversized" compared to their European counterparts. In other countries, a smaller standard is used for a standard sized postcard, but it's still important to know how to read the postcard's size.
US postcards are made from a variety of materials, but the standard is usually paper. The thickness of a postcard should be no more than nine millimeters. The thickness of the paper should be nine to eleven mm, which is about the same as the maximum USPS allows for mail. The UPU has also imposed a maximum size of 5.5 cm by four inches, a size that is larger than the USPS's.
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