Aspect Ratio Calculator

Calculate and convert aspect ratios for images, videos, and screens. Find missing dimensions instantly.

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1. Enter the original width and height of your image or video. 2. The tool instantly calculates and displays the simplified aspect ratio. 3. Enter a new width or height to find the matching dimension that preserves the ratio. 4. Browse common presets like 16:9, 4:3, 1:1, and 21:9 for quick reference. 5. Copy the calculated dimensions to use in your design or development project.

About This Tool

The Aspect Ratio Calculator helps you work with width-to-height proportions for images, videos, screens, and design layouts. Enter any two of three values - width, height, or aspect ratio - and the tool computes the missing value instantly. This is essential for resizing content without distortion.

Aspect ratios are everywhere in digital media. Common ratios include 16:9 for widescreen video, 4:3 for traditional displays, 1:1 for social media squares, 9:16 for vertical mobile content, and 3:2 for photography. This tool handles all standard ratios and lets you define custom ones. It also simplifies any ratio to its lowest terms, so 1920x1080 becomes 16:9.

Designers, video editors, and developers use this tool to ensure images and videos scale correctly across different screen sizes and platforms. Enter your source dimensions to find the simplified ratio, or enter a target ratio and one dimension to calculate the other.

Formula / How It Works

Aspect Ratio = Width / Height, simplified by dividing both by their greatest common divisor (GCD). To find a missing dimension: Height = Width / (Ratio Width / Ratio Height).

Frequently Asked Questions

The most common aspect ratios are 16:9 (widescreen video and monitors), 4:3 (traditional TV and presentations), 1:1 (social media squares), 3:2 (photography and DSLR sensors), 9:16 (vertical mobile video), and 21:9 (ultrawide monitors).
Enter your desired width and select or type the aspect ratio. The tool automatically calculates the matching height. For example, a 1920px width at 16:9 gives a height of 1080px.
Yes. Enter both width and height in pixels, and the tool reduces them to the simplest ratio. For instance, 2560x1440 simplifies to 16:9.
It depends on the platform. Instagram feed posts use 1:1 or 4:5, Stories and Reels use 9:16, YouTube videos use 16:9, and Twitter/X images work best at 16:9 or 2:1. This tool helps you calculate exact pixel dimensions for any ratio.
Yes. It works for any rectangular media - images, videos, screens, or design canvases. Enter your source resolution to find the ratio, or use a target ratio to calculate the dimensions you need.

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