The standard dimensions of playing cards are 2.25 x 3.5 inches for bridge cards and 2.5 x 3.5 inches for poker cards. According to the International Organization of Standards (ISO) specifications, a poker playing card is equal to B8 size.
The size of the playing cards has not always been standard. It has been reduced over time. Other smaller sizes are also available for travel or solitaire. The most common type of modern playing cards is poker cards. A full deck includes 52 cards, with 13 ranks of the four suits, hearts, diamonds, spades and clubs. Most decks also include two cards called jokers as well.