The standard size for business cards is 3.5 inches by 2 inches (8.9 cm by 5.1 cm) . This size is the most commonly used in the United States and Canada, and is also widely accepted around the world. However, there are other sizes available for business cards, including square cards (2 inches by 2 inches, 2.5 inches by 2.5 inches, 3 inches by 3 inches, and 3.5 inches by 3.5 inches) , circle cards (2.5 inches in diameter) , and folded cards (3.5 inches by 4 inches with bleed, or 3.5 inches by 4 inches without bleed) . Its important to keep in mind that while there is a de facto standard size for business cards, there are no officially regulated standard sizes in the United States.