Example: Aspect ratio 16:9. Change the values above to calculate your own.
About the Aspect Ratio Calculator
The aspect ratio is the proportion between width and height. 1920 × 1080 is 16:9; 1080 × 1350 is 4:5. When you resize an image or video, keeping the same ratio avoids stretching.
Enter the original size, then a new width or height, and the calculator fills in the other dimension.
How to use the Aspect Ratio Calculator
- Enter your numbers (or keep the example).
- The result updates instantly as you type.
- Copy the result, or copy the link: it keeps your numbers so you can share them.
Common aspect ratios and resolutions
| Ratio | Used for | Example resolutions |
|---|---|---|
| 16:9 | TV, YouTube, monitors | 1280×720, 1920×1080, 3840×2160 |
| 9:16 | Stories, Reels, TikTok | 1080×1920 |
| 4:3 | Older screens, iPad, many cameras | 1024×768, 4032×3024 |
| 3:2 | DSLR photos, prints (4×6) | 6000×4000 |
| 1:1 | Instagram square, avatars | 1080×1080 |
| 4:5 | Instagram portrait | 1080×1350 |
| 21:9 | Ultrawide monitors, cinema | 2560×1080, 3440×1440 |
| 16:10 | Laptops, MacBooks | 1920×1200, 2560×1600 |
How it's calculated
Ratio = width ÷ GCD : height ÷ GCD. New height = new width × original height ÷ original width.
Features
- Instant resultsUpdates as you type.
- Shareable linkThe URL keeps your inputs.
- Reference tableCommon values on this page.
- Works offlineRuns in your browser.
Frequently asked questions
Is the Aspect Ratio Calculator free?
Yes, the Aspect Ratio Calculator is free with no sign-up, no limits and no ads covering the result.
Does it work on my phone?
Yes. It works in any modern browser on phones, tablets and computers, and keeps working offline once the page has loaded.
Last updated · Processing happens locally in your browser.