Aspect Ratio Calculator
Work out the missing width or height for a target ratio.
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Keep images and videos perfectly proportioned. Set an aspect ratio (like 16:9 or 4:3) and enter either the width or the height, and the tool works out the matching dimension. It is ideal for resizing, cropping and designing for screens. The calculation runs live in your browser.
How to use Aspect Ratio Calculator
- 1
Enter your aspect ratio (e.g. 16:9).
- 2
Type either the width or the height.
- 3
Read the matching dimension.
Frequently asked questions
Yes. Enter any ratio, or pick a common preset like 16:9, 4:3 or 1:1.