Aspect Ratio Calculator
Resize width and height while keeping the same aspect ratio.
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16:9
Aspect ratio
How to use
- Enter your original width and height to set the ratio.
- Change either the new width or new height.
- The other dimension updates automatically to keep the ratio.
Frequently asked questions
What is aspect ratio?
The proportional relationship between width and height, like 16:9 or 4:3. Keeping it constant prevents images and videos from stretching.
Can I see the simplified ratio?
Yes. The tool shows the ratio reduced to its simplest whole-number form, such as 1920×1080 → 16:9.
🔒 This tool runs entirely in your browser. Nothing you enter is uploaded, logged, or stored.
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