A business card can be a very useful thing when promoting new businesses. The standard size for a standard business card in the United States is 3.5 by 2 inches.
Standard business card size is 2x3.5 inches - U.S. Standard.
3.5" by 2"
The standard Business Cards size in Canada ..Thickness of cards:14 points and 16 points
The standard size for visiting cards and business cards varies considerably between countries.
Business cards are commonly measured in inches. But if you want, you can ask the printing company about giving you the measurements in millimeters. The U.S. standard size of business card is 2x3.5 inches - which translates to 50.5mmx88.9mm.
The standard size of an index card is 3 X 5.
"The standard business card size in the USA is 3.5 inches by 2 inches. However, many places now offer a variety of sizes for business cards, and with everyone owning a printer, it's easy to buy card stock to print them on and choose your own non-standard size."
The standard size of a playing card is 2.5 inches by 3.5 inches.
As far as I know, there are only three: the 3" round disk, a business card size (square shaped like a business card and 3" on the long side) and the standard CD size.
Business cards are typically small in size. The U.S. standard business card size is 2x3.5 inches - this is the most common. The Slim and Square business cards - which are 1.75x3.75 inches and 2x2 inches respectively - are also standard sizes. You can order custom sizes but they only go as big as 4x4 inches. Source: http://www.digitalroom.com/business-cards-printing.html
The standard size for a photo ID card is 3.375 inches by 2.125 inches, which is the same size as a credit card.
A business card size is 2 inches by 3.5 inches