SerenImages tool · Free
Aspect Ratio Calculator
Enter any two values and the calculator solves the rest: pick a ratio like 16:9 and a width to get the height, or enter a width and height to discover the ratio. Presets cover video, social formats and photography.
16:9
Simplified ratio
1,920
Width (rounded px)
1,080
Height (rounded px)
Common sizes for 16:9
Edit the width and the height follows the chosen ratio, or edit the height to solve the width. Pixels are whole numbers, so results are rounded to the nearest pixel while the exact ratio is shown alongside. Everything runs in your browser.
How to use it
- 1Pick a preset ratio or type your own
- 2Enter the dimension you know
- 3Read the calculated dimension and rounded pixel sizes
Private by design
This tool runs completely in your browser. Nothing you type, paste or drop here is uploaded to any server, which makes it safe for confidential text and files. It is built by the team behind Seren, the AI workspace that treats your data the same way.
See what Seren can do→Frequently asked questions
What aspect ratio is a YouTube video?+
16:9. At full HD that is 1920 by 1080 pixels; at 4K it is 3840 by 2160.
What ratio do Instagram stories use?+
9:16, commonly 1080 by 1920 pixels. Feed posts work well at 1:1 or 4:5.
Why do my numbers get rounded?+
Pixels are whole numbers, so the calculator rounds to the nearest pixel and shows the exact ratio alongside.
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