How to work out Resolution from Ratio

To work out the specific resolution according to a set ratio you can use the calculation below. You need to know the height of the image (you can do this via the width, but need to swap around the calculations as done below).

For example, if you have a height of 2160 pixels you can divide it by the height of the ratio and then times it by the width of your ratio to find out the resolution of the width.

Calculation = (Resolution Height/Ratio Height) x (Ratio Width) = Resolution Width

Example Calculations for 16:9 Ratio:

Example 1: For 16:9 Ratio

Let’s say you have a resolution of 2000 for the height of the image, and you want to work out what a 16:9 ratio would be.

2000/9 = 222.222… (rounded to 221).
221 x 16 = 3555.555… (rounded to 3555).

Answer:

Height = 2000
Width = 3555

Example 2: For 16:9 Ratio

Width: ?
Height: 2160

2160/9 = 240
240 x 16 = 3,840

Answer:

Width = 3840
Height = 2160.

Obviously the calculation directly above is 4k for 16:9 and is a well known resolution, so this calculation would likely not be needed as is the same for other video/cinema ratio’s although this calculation may come in handy at some point if you are creating a new resolution for a abstract artistic, scientific or some other uncommon ration and resolution.

For further insights into ultrawide, 21:9 or 16:9 ratios – please see the Aspect Ratio and Resolution for Ultrawide screen, 21:9 and 16:9.