Aspect Ratio Calculator
Enter any width and height to get the simplified aspect ratio, the decimal value and a live preview box that matches your ratio. It also includes a resize helper that calculates the matching width or height so your images and video never stretch.
Simplified Ratio
16 : 9
Decimal: 1.78 - e.g. Full HD, YouTube, most TVs
Preview
Resize Helper (keeps the same ratio)
Height is calculated automatically.
Width is calculated automatically.
How to use
- Enter your width and height to see the simplified ratio and decimal value.
- Or tap a preset like 16:9 for video or 9:16 for Reels and Shorts.
- The blue preview rectangle always matches your ratio.
- In the resize helper, type a new width to get the matching height (or the other way round).
Tips
- 16:9 is the standard for YouTube and most video; 9:16 is for Reels, Shorts and TikTok.
- 1:1 works well for square social posts and profile photos.
- For print, keep the ratio locked while resizing so the layout does not distort.
- Round to whole pixels before exporting to avoid blurry edges.