What is Aspect Ratio?

In photography, aspect ratio represents the relationship between the width and the height of an image. It can be expressed as a number followed by a colon and followed by another number, such as 3:2, or by a decimal number such as 1.50 (which is simply the long side divided by the short side).

You can easily visualize any aspect ratio by allocating units to the width and the height of an image. For example, a 4:3 aspect ratio would consist of 4 equal size units for its width and 3 equal size units for its height.