Guide to Standard Stamp Sizes

Stamps play a crucial role in both daily communication and business tasks. They are used for imprinting messages on documents and as postage stamps for postal services. In this article, we’ll explore the standard sizes of these versatile tools.

Rubber Stamp Sizes

Rubber Stamp Sizes

Rubber stamps are commonly used by independent businesses such as law firms and accountants for adding their business name and address to the outside of envelopes when they send mail.

These types of stamps can also be used in lieu of letter-headed paper or on the back of business cards. If you’re thinking of having a personalized rubber stamp made, here you can take a look at the most common standard sizes available.

Small Rectangle Stamp

A small rectangle stamp typically measures 1.5 inches by 0.5 inches. This compact stamp can fit up to three lines of text, but the font may be small and hard to read. It’s best suited for a company name or logo.

  • Dimensions: 1.5″ x 0.5″
  • Lines of text: Up to 3

Round Stamp

A standard round stamp measures 1.6 inches in diameter. It can accommodate up to 9 lines of small text or 6 lines of medium text and stands out due to its unique shape.

  • Dimensions: 1.6″ diameter
  • Lines of text: Up to 9 small or 6 medium

Square Stamp

Square stamps measure 1.6 inches by 1.6 inches and can also accommodate up to 9 lines of small text or 6 lines of medium text. The square shape allows text to extend to the edges without being restricted by a circular shape.

  • Dimensions: 1.6″ x 1.6″
  • Lines of text: Up to 9 small or 6 medium

Medium Rectangle Stamp

A commonly used size for businesses, the medium rectangle stamp measures approximately 2 inches by 0.7 inches. It can fit up to 5 lines of text.

  • Dimensions: 2.0″ x 0.7″
  • Lines of text: Up to 5

Large Rectangle Stamp

Measuring 2.35 inches by 0.9 inches, a large rectangle stamp can fit up to 6 lines of text. It is suitable for displaying the company name and address, along with contact information such as phone numbers, a website, or email.

  • Dimensions: 2.35″ x 0.9″
  • Lines of text: Up to 6

Extra Large Rectangle Stamp

The largest standard size, the extra large rectangle stamp measures 2.75 inches by 1 inch and can accommodate up to 7 lines of text. Within the 7 lines, you can choose to include more information or opt for a larger font size to improve readability.

  • Dimensions: 2.75″ x 1.0″
  • Lines of text: Up to 7

Postage Stamp Sizes

Postage Stamp Sizes

Postage stamps are another type of stamp that comes in various sizes. The size of postage stamps can differ according to the country they are sold in, the type of letter or parcel they are for, and the service they are used for.

In some cases, the different size of a stamp is simply down to it being a different design, and the size may not indicate anything in particular about the stamp. Here we will look at various different standard sizes of postage stamps from around the world.


The United States Postal Service (USPS) issues first-class postage stamps sized at 0.87 inches by 0.98 inches. These are known as ‘forever stamps’ as they remain valid even if postage prices increase in the future. Although this specific size is common, other dimensions are used for different designs, measuring up to 1.26 inches by 1.59 inches. Notably, larger or unusually shaped stamps often appear during the holidays or to commemorate special events.

Canada Post

Postage stamps for mailing standard-size letters in Canada are typically 22mm wide and 25mm high, equivalent to 0.87 inches by 0.98 inches. These stamps are similar in size to their first-class USPS counterparts, but they also produce commemorative stamps in various dimensions. A square-shaped stamp commemorating the 100th anniversary of the Halifax Explosion, for example, measured 32mm (1.26 inches) on each side.

Royal Mail

Royal Mail in the UK produces first-class and second-class postage stamps that measure 21mm wide by 24mm high. In imperial units, this is 0.82 inches wide by 0.94 inches high. You can differentiate them by color, with first-class stamps being red and second-class stamps being blue. Large letter stamps are available for bigger letters, while limited edition designs come in alternative sizes and celebrate or commemorate occasions or individuals.