Christmas cards come in all shapes and sizes, but the most common size is the standard A2 size, which measures 4.25 inches wide and 5.5 inches tall. Other popular sizes include the A6, which is smaller, measuring 4.13 inches wide and 5.83 inches tall, and the A7, which is a bit bigger, measuring 5 inches wide and 7 inches tall. There are also larger sizes such as the A1, which is 23 inches wide and 33 inches tall, and the A0, which is 33 inches wide and