Aspect Ratio Calculator
Enter width and height to get the simplified ratio, scale to a new width or height, use common presets and see the closest standard ratio.
What is Aspect Ratio Calculator
Type any width and height to get the reduced aspect ratio (1920×1080 → 16:9) plus its decimal value; enter a new width or height to scale proportionally. Presets cover 16:9, 4:3, 21:9, 1:1, 9:16, 3:2 and 4:5 alongside common display resolutions.
How to use Aspect Ratio Calculator
- Enter the original width and height (or pick a preset)
- See the simplified ratio — non-standard sizes show the closest standard ratio
- Enter a new width or height to get the proportional counterpart
Frequently asked questions
What aspect ratio is 1366×768?
Exactly 683:384 — a rounding artifact of adapting 1024×768 panels toward widescreen, not true 16:9. The tool shows the exact ratio and flags 16:9 as the closest standard.
Which aspect ratio should I use?
16:9 for monitors and video, 9:16 for vertical short-form video, 1:1 for avatars, 4:5 for feed-friendly portrait posts, 3:2 for photography, and 21:9 for ultrawide displays.
How do I scale to a new size?
Fill in either the new width or new height field and the other side is computed proportionally — 16:9 at width 1280 gives 720 high; non-integer results can be rounded to the nearest pixel.
Is Aspect Ratio Calculator free?
Aspect Ratio Calculator is completely free — open the page and use every feature with no hidden charges.
Do I need to download or install Aspect Ratio Calculator?
No download or installation is needed. It is an online tool that runs in the browser on your phone, tablet and computer.
Do I need an account to use Aspect Ratio Calculator?
No. Use the tool right away — no account or sign-in required.
Does Aspect Ratio Calculator work on mobile?
Yes. The page is fully responsive and works on phones, tablets and desktop browsers.