Aspect Ratio Calculator
Simplify any width and height into an aspect ratio and calculate the missing dimension for video, images and CSS layouts.
Local processingAspect Ratio Calculator
What is Aspect Ratio Calculator?
An aspect ratio describes how wide an image, video or layout is compared with its height. This calculator reduces any width and height pair to its simplest form and computes the matching height or width for a target dimension.
How It Works
Both dimensions are divided by their greatest common divisor. The result is shown as a simplified ratio such as 16:9, together with the decimal ratio and the resized counterpart for a chosen width or height.
Common Use Cases
- Choosing video and image dimensions without distortion
- Setting the CSS aspect-ratio property
- Resizing thumbnails while preserving proportions
- Checking common formats such as 16:9, 4:3 and 1:1
Technical Details
Uses an iterative Euclidean greatest-common-divisor algorithm on integer dimensions. Decimal inputs are rounded before reduction; all calculations are local.
How to Use
Enter your input above. The result updates automatically. Use the copy button to copy the result.
Privacy
All processing happens in your browser. Your data is never uploaded to any server.
FAQ
Does it support decimal dimensions?
Yes. Decimal width and height values are accepted and rounded to whole pixels before the ratio is simplified.
Is my data uploaded to a server?
No. Everything runs locally in your browser. Your input never leaves your device.
Does Aspect Ratio Calculator work on mobile?
Yes. The interface is responsive and works in modern mobile browsers without installing an app.