desktop-tv · Verified 2026-08-31 · Official source
Calculate ratios and dimensions
Aspect Ratio Calculator
Calculate a ratio from width and height, or enter a ratio and one dimension to find the missing size.
Result
16 : 9
- Decimal ratio
- 1.7778:1
- Orientation
- landscape
- Dimensions
- 1920 x 1080 px
- Nearest common ratio
- 16:9 · Exact match · 0% deviation
Quick ratios
Preset ratioPlatform presets
Choose a platform, then a placementmobile · Verified 2026-08-31 · Official source
cover · Verified 2026-08-31 · Official source
all · Verified 2026-08-31 · Official source
Popular starting points
Common aspect ratios
16:91920 x 1080Widescreen video9:161080 x 1920Vertical video4:51080 x 1350Portrait images4:31600 x 1200Photos and presentations3:21500 x 1000Camera photography1:11080 x 1080Square images
View all ratio guidesImage workflow
Need to resize or crop an image?
Set a target ratio, then crop to fill, fit to preserve the image, or pad the remaining space before exporting.
Learn the basics
Make the numbers useful
How calculation works
Divide width and height by their greatest common divisor to simplify a ratio. When one dimension is missing, multiply the known side by the matching ratio value, then round only the final pixel result when needed.
Learn how to calculate aspect ratioUnderstanding the result
A ratio names a shape, not a file size. Dimensions and resolution describe pixels, so 1280 x 720 and 1920 x 1080 can share 16:9 while delivering very different amounts of detail.
Read the aspect ratio calculation guideQuick answers
Frequently asked questions
Does changing aspect ratio change resolution?
No. A ratio describes the frame's shape, while resolution counts its pixels. Changing dimensions can preserve the same ratio but still raise or lower resolution.
Can two different sizes have the same aspect ratio?
Yes. Dimensions such as 1280 x 720 and 1920 x 1080 both simplify to 16:9 because width and height scale by the same factor.
Which ratio should I use for vertical video?
A 9:16 frame is the common full-screen vertical shape. Confirm the destination's current pixel and safe-area requirements before publishing.
Developer reference
Build stable media layouts
Use the CSS aspect-ratio property to reserve a predictable frame before images and video load, then pair it with explicit media dimensions where appropriate.