Aspect ratio calculator

Find the aspect ratio (e.g. 16:9) of an image or screen and resize keeping the proportion.

Aspect ratio

16:9

As decimal1.778

New height (keeping ratio)720 px

How the calculation works

The aspect ratio is width:height simplified by the GCD. To resize keeping the ratio: new height = new width × height ÷ width.

What is the Full HD ratio?

1920×1080 is 16:9, the standard widescreen video ratio.

Convert colors between HEX (#RRGGBB) and RGB formats.

Updated on June 18, 2026 · by Rafael Rossi · Methodology & sources