Skip to the tool

HomeShrink & resize

Aspect ratio calculator

Find the matching height or width for any ratio.

Runs in your browserNo sign-upNo watermark

Your files never leave your device.

Quick answer

To find an aspect ratio, type the width and height: 1920 x 1080 is 16:9. To keep a ratio when resizing, pick it, type the new width and the height is worked out for you.

Read the guide: How to calculate an aspect ratio

Find the aspect ratio of a size

16:9

That is 1.778 wide for every 1 high. 16:9 is used for video, most screens, YouTube.

Resize to a ratio

Pick one, or type your own such as 16:9, 4/3 or 1.91:1.

Change either side and the other follows, rounded to a whole pixel.