Calculate aspect ratios for any size
Find missing dimensions for images, videos, and UI elements based on standard or custom aspect ratios.
About This Tool
Aspect Ratio Calculator is essential for designers and developers who need to maintain correct proportions when resizing images, videos, or responsive UI containers.
Key Features
How to Use
- 1Select a preset ratio (e.g. 16:9) or enter a custom ratio.
- 2Enter either the width or height.
- 3The missing dimension is calculated instantly.
Why Use ToolSnippet Aspect Ratio Calculator?
Tips for Best Results
- Use 16:9 for YouTube thumbnails and video embeds
- Use 1:1 for Instagram post images
- Use 9:16 for mobile stories and TikTok-style vertical video
Frequently Asked Questions
What is aspect ratio?
Aspect ratio is the proportional relationship between width and height, e.g. 16:9 means for every 16 units of width, there are 9 units of height.
Can I enter a custom ratio?
Yes, you can enter any W:H ratio in the custom ratio fields.
What units are used?
The tool is unit-agnostic. You can use pixels, centimetres, inches — just be consistent.
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