Math
Aspect Ratio Calculator
Enter width and height — get the ratio. Also calculates new dimensions while preserving ratio.
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Aspect ratio
Common ratios
Common ratios
Enter width and height to calculate
What does Aspect Ratio Calculator?
Calculate missing dimensions and maintain aspect ratios for images and videos.
How to use Aspect Ratio Calculator?
- Enter the original width and height.
- Enter the new width or height (leave one blank).
- View the calculated missing dimension that preserves the aspect ratio.
Key features
- Calculates width, height, or aspect ratio from any two values.
- Common preset ratios (16:9, 4:3, 1:1, etc.).
- Useful for responsive design, video thumbnails, and image resizing.
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 wide, it is 9 units tall.
What aspect ratio should I use for YouTube videos?
YouTube recommends 16:9 for standard videos, which equals 1920×1080 at full HD resolution.
Is this tool free?
Yes, this tool is completely free and requires no registration.
Is my data saved?
No. All calculations happen in your browser only — no data is sent to any server.