Aspect Ratio Calculator
Enter width and height to calculate the aspect ratio. Or enter a ratio and one dimension to find the other.
Aspect Ratio
16:9
Decimal
1.7778
Common Name
16:9 — Widescreen HD
1920 x 1080
Common Aspect Ratios
How It Works
Enter width and height to calculate the aspect ratio, or input a ratio with one dimension to find the missing one. The tool displays results in standard notation (16:9), decimal, and common names like Widescreen or Square. A visual preview updates live as you type.
When to Use It
- Resizing images or videos for platforms requiring specific ratios (Instagram 1:1, YouTube 16:9, TikTok 9:16).
- Designing responsive layouts where elements must maintain proportions across screen sizes.
- Calculating display dimensions when you know the diagonal size.
Frequently Asked Questions
What are the most common aspect ratios?
16:9 (widescreen/YouTube), 4:3 (classic TV/iPad), 1:1 (Instagram), 9:16 (TikTok/Stories), 21:9 (ultrawide), and 3:2 (cameras). The tool includes a reference table.
How does the dimension converter work?
Enter a ratio (e.g., 16:9) and one dimension (e.g., width 1920). The tool calculates the missing dimension (1080) proportionally. Perfect for resizing while maintaining the ratio.
Does the preview update in real time?
Yes. As you change values, the preview adjusts immediately. This visual feedback helps you understand proportions before committing to a size.
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