Aspect Ratio Converter

IMAGE: Knelstrom Media.

​This tool calculates the correct matching dimension for any standard aspect ratio.
Enter either the width or the height in pixels, select a ratio such as 16:9, 4:3, 1:1, or 21:9, and it will generate the full-resolution image instantly.
It's useful for video editing, graphic design, photography, print layout design, and preparing content for social platforms.

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Aspect Ratio Converter

Enter one dimension and choose an aspect ratio to calculate the matching width or height.

Known dimension: Width Height

Value (pixels):

Aspect ratio: 16 : 9 (widescreen) 9 : 16 (vertical video) 4 : 3 3 : 4 1 : 1 (square) 3 : 2 21 : 9 (ultrawide)

Calculate

Aspect ratio –

Full resolution –

Known dimension	Calculated dimension
–	–

Values are rounded to the nearest whole pixel. For video encoding, you may want to round to the nearest multiple of 2, 4 or 8.