Aspect Ratio Calculator
Calculate aspect ratios for images, videos, and displays. Convert between different aspect ratios and find matching dimensions while maintaining the same ratio.
Enter ratio as width:height (e.g., 16:9)
How to Use This Calculator
- Enter the width and height of your image, video, or display in pixels or any unit.
- The calculator automatically computes the aspect ratio and shows it in simplified form (e.g., 16:9).
- Optionally, enter a target ratio (e.g., 16:9) to see converted dimensions that maintain that ratio.
- Use the converted dimensions to resize or crop your content to match the desired aspect ratio.
Aspect Ratio Formula
Aspect ratio is calculated by finding the greatest common divisor (GCD) of width and height, then expressing the ratio in simplest form:
Example: For 1920×1080, the GCD is 120. The ratio is (1920÷120):(1080÷120) = 16:9.
Full Description
Aspect ratio is a fundamental concept in photography, videography, and display technology. It describes the proportional relationship between width and height, determining how content appears on screens and how images are cropped or formatted.
Different aspect ratios serve different purposes: 16:9 is standard for video and widescreen displays, 4:3 was traditional for TV and early computer monitors, 1:1 is popular for social media (Instagram), and 21:9 provides an ultrawide cinematic experience. Understanding and converting between ratios is essential for content creators working across multiple platforms.
This calculator helps you identify aspect ratios, convert between formats, and find matching dimensions. Whether you're resizing images for social media, formatting video for different platforms, or planning display layouts, this tool ensures your content maintains proper proportions and displays correctly.
Frequently Asked Questions
What is aspect ratio?
Aspect ratio is the proportional relationship between the width and height of an image, video, or display. It's expressed as width:height (e.g., 16:9 means the width is 16 units for every 9 units of height).
What are the most common aspect ratios?
Common ratios include 16:9 (widescreen video), 4:3 (traditional TV), 21:9 (ultrawide), 1:1 (square, Instagram), 3:2 (photography), and 16:10 (computer monitors). Each serves different purposes and display formats.
How do I convert between aspect ratios?
Enter your current dimensions and the target ratio. The calculator shows new dimensions that maintain the target ratio. You can either keep width constant (adjust height) or keep height constant (adjust width).
Why is aspect ratio important?
Aspect ratio affects how content displays on different screens, how images are cropped, and how video is formatted. Matching aspect ratios prevents black bars, cropping issues, and ensures content displays correctly across devices.