Free Aspect Ratio Calculator

Compute dimensions for any aspect ratio.

Ratio width

Ratio height

Width (px)

Height (px)

Height: 1080 px

Result

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How to use the Aspect Ratio Calculator

1Enter ratio and one dimension.
2Get the other dimension.

Features

Presets 16:9, 4:3, 1:1, 21:9
Both directions
Pixel-exact

Frequently Asked Questions

Why does 16:9 sometimes give decimals?

Some widths don’t divide evenly; round to the nearest pixel.

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About the Aspect Ratio Calculator

Find missing dimensions for target aspect ratios and get common presets like 16:9. The Aspect Ratio Calculator runs entirely in your browser — your data is processed locally and never uploaded to a server. Explore more Calculators tools or browse all free online tools.