How Big Is A 4×6 Photo? The 4×6 photo measures 4 inches wide and 6 inches high with an aspect ratio of 2:3. This converts to 0.33 x 0.5 feet and 10.16 x 15.24 centimeters. Its pixel size varies with resolution, the most common being 1200 x 1800 pixels at 300 ppi.