For images
Resize portfolio images, thumbnails and website visuals without stretching the content or cropping the wrong part.
Free aspect ratio calculator for images and video
Resize images proportionally.
Calculate image and video ratios, convert dimensions and keep your visuals perfectly proportional for web design, social media and responsive layouts.
16:9
Ratio16:9
Decimal1.78
New size—
aspect-ratio: 16 / 9;
For video
Check 16:9, 9:16, 1:1 and other common video formats before publishing to social platforms or embedding online.
For CSS
Copy an aspect-ratio rule and use it in responsive cards, image containers, hero sections and embedded media blocks.
What is an aspect ratio?
An aspect ratio describes the proportional relationship between width and height. Common ratios include 16:9 for video, 1:1 for square images and 9:16 for vertical social media content.
This aspect ratio calculator helps you resize images and videos without distortion. Enter the original width and height, then choose a new width or height to calculate the matching dimension.
Use this tool for websites, portfolio images, thumbnails, social media posts, video frames and responsive design layouts.
Frequently asked questions
What is the most common aspect ratio?
16:9 is one of the most common ratios for video and web banners. For social media, 1:1, 4:5 and 9:16 are also widely used.
How do I resize an image without distortion?
Keep the same aspect ratio. Enter the original width and height, then calculate the matching new width or height.
Can I use aspect-ratio in CSS?
Yes. Modern CSS supports the aspect-ratio property, for example: aspect-ratio: 16 / 9.