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アスペクト比計算機 - DevToolBox

Calculate and convert aspect ratios for images, videos, and screens. Find missing dimensions, use common presets like 16:9, 4:3, 1:1. Free online tool.

Original Dimensions
16:9
Aspect Ratio
Calculate New Dimensions
Common Presets
Visual Preview
16:9

What is Aspect Ratio Calculator?

Aspect Ratio Calculator helps you calculate the aspect ratio of any image, video, or screen from its width and height. It also helps you find missing dimensions when you know one dimension and the desired aspect ratio.

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How to Use

  1. Enter the original width and height
  2. View the calculated aspect ratio
  3. Enter a new width or height to calculate the missing dimension
  4. Use preset ratios for common formats

Use Cases

  • Calculate aspect ratios for responsive web design
  • Find correct dimensions for video thumbnails
  • Resize images while maintaining proportions
  • Determine screen ratios for design mockups

FAQ

What is aspect ratio?
Aspect ratio is the proportional relationship between width and height, expressed as two numbers like 16:9 or 4:3.
What is the most common aspect ratio?
16:9 is the most common for HD video and modern screens. 4:3 was the traditional TV standard.
How do I calculate a missing dimension?
Enter one dimension (width or height) and click the calculate button to find the other dimension based on the current aspect ratio.