Aspect Ratio Calculator
Simplify ratios and resize images, videos, and layouts while preserving proportions.
Source Dimensions
Enter the original width and height to calculate the simplified ratio.
Ratio Result
Landscape format from 1,920 x 1,080
Simplified ratio
16:9
Decimal ratio 1.7778
CSS
16 / 9
aspect-ratio value
Fallback
56.25%
padding-bottom
Source
1,920 x 1,080
Landscape
Scale Dimensions
Type a target width or height. The paired value updates using the same ratio.
Resized Output
New dimensions
1,280 x 720
66.67% of the original width
Width formula
height x 1.7778
Height formula
width / 1.7778
Ratio lock
16:9
How Aspect Ratios Work
An aspect ratio describes the proportional relationship between width and height. A 1920 x 1080 video reduces to 16:9 because both numbers can be divided by 120.
To resize without distortion, keep the same ratio. If the width changes, height is calculated as width divided by the ratio. If height changes, width is calculated as height multiplied by the ratio.
Common Uses
- Resize images for thumbnails, banners, and blog graphics
- Plan video exports for YouTube, Reels, Shorts, and Stories
- Keep UI mockups, cards, and media containers proportional
- Generate CSS aspect-ratio values for responsive layouts
- Find the closest common ratio for custom dimensions