The aspect ratio of an image is the ratio of its width to its height. It is expressed as two numbers separated by a colon, width:height. Common aspect ratios are 1.85:1 and 2.40:1 in cinematography, 4:3 and 16:9 in television, and 3:2 in still photography.

An aspect ratio is the dimensions of an image expressed in a ratio form. You determine the aspect ratio by comparing an image’s width and height, then writing it as a width:height ratio (such as 3:2 or 4:5).

Aspect ratio is a proportional relationship between the width and height of an image. It is usually described with two numbers and a colon between them — for example, 2:1. This means that the width of the image is twice its height. It's a very useful concept for resizing photos or videos for your blog or social media account.

What is the image aspect ratio? The aspect ratio is the proportional relationship between an image’s width and height. Different cameras shoot in different aspect ratios, so whether you’re using a digital camera, a 35mm film camera, or an iPhone, they can all vary.

Let’s look at the aspect ratio of an image. A 6 × 4 inch image has an aspect ratio of 3:2, whereas a 1000 × 1000 inch square image has an aspect ratio of 1:1. An aspect ratio does not have units attached—instead, it represents how large the width is compared to the height.