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Free Tool Arena

Developer Utilities · Free tool

Aspect Ratio Calculator

Keep images and video in proportion — enter width or height, get the matching dimension for any aspect ratio.

Updated April 2026

Preset ratios

1.778:1

Results

Aspect ratio
16:9
Decimal
1.7778
GCD
120

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What it does

Keep images and video in proportion. Enter a width or height for a given aspect ratio (16:9, 4:3, 1:1, 2.35:1) and the tool fills in the matching dimension. Also reverses: paste width and height and get the simplified ratio and closest standard.

Pair with image resizer, image dimensions checker, and social media image sizes.

How to use it

  1. Pick or type an aspect ratio.
  2. Enter width — height fills in (or vice versa).
  3. Reverse mode: paste width and height, see the ratio.
  4. Copy the dimensions for your editor.