Square

The square business card size has dimensions of 2.5 x 2.5 inches or 64 x 64 mm, giving it a surface area of 6.25 square inches or 40 square cm. As a square format, it allows for design symmetry and unique layouts that utilize the shape. The square card can be enclosed in a standard 3.75 x 6.5 inch envelope or 6.5 x 6.5 inch square envelope.

Square business cards grew in popularity in the 1970s and saw a resurgence in the 2000s as companies sought innovative designs. The equal width and height lends itself to balanced logos, graphics, or patterns. It also stands out from the traditional rectangular shape when exchanged. The limited space requires prioritizing the most essential contact details. Some designers use the square's symmetry to create two-sided cards with inverted content. The square format works for artistic branding approaches or minimalist contacts-focused layouts. Its memorable shape gives this unique size lasting appeal.