Aspect Ratio Calculator and Finder
Use this free aspect ratio finder to calculate image and video dimensions instantly. Enter width and height to find the exact aspect ratio, or choose a common ratio to calculate a missing dimension for images, videos, social media and digital designs.
Enter dimensions to calculate your aspect ratio.
What Is an Aspect Ratio?
An aspect ratio describes the proportional relationship between an image or video’s width and height. Common ratios include 16:9 for widescreen video, 1:1 for square images, 4:3 for traditional displays, 3:2 for photography, and 9:16 for vertical video.
How to Use This Aspect Ratio Calculator
- Enter a width and height to calculate the simplified aspect ratio.
- Or choose a common ratio and enter one dimension.
- Select whether you want to calculate the missing width or height.
- Click the calculator button to get the result.
Common Aspect Ratios
- 16:9: widescreen video, displays, websites and presentations.
- 1:1: square images and social media graphics.
- 4:3: traditional display and presentation formats.
- 3:2: common photography dimensions.
- 9:16: vertical video and mobile-first content.
- 21:9: ultrawide and cinematic formats.
Why Aspect Ratio Matters
The correct aspect ratio helps prevent unwanted cropping, stretching, and empty space. It is useful when resizing photos, videos, thumbnails, presentations, website images, and digital advertising.
Aspect Ratio Calculator FAQ
What is the most common video aspect ratio?
16:9 is one of the most widely used widescreen video aspect ratios.
What aspect ratio is best for vertical video?
9:16 is commonly used for vertical, mobile-first video.
How do I calculate an aspect ratio?
Divide the width and height by their greatest common divisor, then write the resulting numbers as width:height.
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