Aspect Ratio Calculator

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This free aspect ratio calculator can help you find the aspect ratio of any rectangular shape. You can also use it to calculate the width or height for a given aspect ratio. The aspect ratio is the proportional relationship between the width and height of an image. It is commonly expressed as two numbers separated by a colon, as in 16:9. For example, a square image has an aspect ratio of 1:1, since the height and width are the same. An image with a 4:3 aspect ratio is 4 units wide for every 3 units high. An image with a 16:9 aspect ratio is 16 units wide for every 9 units high.