Image Ratio Calculator
Calculate the aspect ratio of an image from its width and height dimensions. Identify common ratios and understand image proportions for cropping and resizing.
How to Use This Calculator
- Enter your image width and height in pixels (or any unit—the ratio will be the same).
- The calculator automatically computes and displays the aspect ratio in simplified form (e.g., 16:9).
- Review the decimal ratio and see if it matches any common aspect ratios.
- Use this information for cropping, resizing, or formatting images for different platforms.
Aspect Ratio Formula
Aspect ratio is calculated by finding the greatest common divisor (GCD) and simplifying:
Decimal Ratio = Width ÷ Height
Example: For 1920×1080, GCD is 120. Ratio = (1920÷120):(1080÷120) = 16:9. Decimal = 1.777...
Full Description
Aspect ratio is a fundamental property of images, videos, and displays. It describes the proportional relationship between width and height, determining how content appears and how it\'s formatted. Understanding aspect ratios is essential for photographers, videographers, and designers working across different platforms and devices.
Different aspect ratios serve different purposes: 16:9 is standard for video and widescreen displays, 4:3 was traditional for TV and early photography, 1:1 is popular for social media (Instagram), 3:2 is common in photography, and 21:9 provides an ultrawide cinematic experience. Each ratio has its strengths and is suited for specific types of content.
This calculator helps you identify aspect ratios quickly and accurately. Whether you\'re resizing images for social media, formatting video for different platforms, or planning display layouts, knowing the aspect ratio ensures your content displays correctly without unwanted cropping or distortion. Use it to maintain proper proportions when converting between formats or preparing content for specific platforms.
Frequently Asked Questions
What is aspect ratio?
Aspect ratio is the proportional relationship between width and height, expressed as width:height. Common ratios include 16:9 (widescreen), 4:3 (traditional), 1:1 (square), and 3:2 (photography).
How do I find the aspect ratio of an image?
Divide the image width by its height to get the decimal ratio, then simplify to the lowest whole numbers. For example, 1920÷1080 = 1.777... which simplifies to 16:9. This calculator does this automatically.
Why is aspect ratio important?
Aspect ratio affects how images display on different screens, how they're cropped, and how they're formatted for different platforms. Matching aspect ratios prevents unwanted cropping or black bars.
Can I use this for video too?
Yes! This calculator works for any rectangular dimensions—images, videos, displays, or prints. Enter the width and height in any unit (pixels, inches, etc.) and get the aspect ratio.