People may ask you how big is a 4×6 photo, then it is 4 by 6 inches or about 10.2 cm by 15.2 cm. It is one of the most popular and one of the most widespread sizes of printed photographs in the whole world. The 4×6 format fits the standard 3:2 aspect ratio of most of the digital cameras as discussed by  Visuals Clipping. It fits easily in the photo album or informal prints due to its convenient size.