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Aspect Ratio Calculator

Calculate and simplify aspect ratios. Find missing dimensions and preview common formats for video, image, and design use.

About Aspect Ratio Calculator

Simplify any resolution to its aspect ratio, calculate missing dimensions, and preview common formats for video and design.

The Aspect Ratio Calculator simplifies any resolution to its aspect ratio, calculates missing dimensions while maintaining proportions, and previews common video and image formats. It is useful for video editors, graphic designers, web developers, and content creators who need to work with consistent proportions across different placements.

How to use Aspect Ratio Calculator

Enter width and height to find the simplified aspect ratio, or enter one dimension with a target ratio to calculate the other. Preview common formats such as 16:9, 4:3, 1:1, and 9:16, then confirm current upload requirements in the platform where you will publish.

Aspect Ratio Calculator example

Enter 1920 x 1080: The calculator shows this is a 16:9 ratio. Need a 4:3 version? Enter width 1920 with 4:3 ratio to get 1920 x 1440. The tool helps with the math, while final platform requirements should be checked before publishing.

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Helpful questions

What is the standard video aspect ratio?

16:9 (widescreen) is the most common for YouTube, TV, and web video. Other common ratios: 4:3 (traditional), 1:1 (social media), 9:16 (vertical/Stories), 21:9 (ultrawide/cinema).

What aspect ratio does Instagram use?

Instagram placements commonly use ratios such as 1:1, 4:5, 9:16, and landscape formats, but supported sizes and cropping behavior can change. Check the current platform guidance before preparing final assets.

How do I maintain aspect ratio when resizing?

Lock the aspect ratio and change one dimension. The other dimension automatically adjusts proportionally. Our calculator does this math instantly for any target ratio.

What's the best aspect ratio for thumbnails?

Many video thumbnails use 16:9, including common YouTube thumbnail workflows, but social and ad platforms vary by placement. Match the current platform requirements for the specific destination.