Enter dimensions to calculate the aspect ratio, or pick a preset and scale to any size.

Dimensions → Ratio
Width
×
Height
Common Presets
Scale to Size
Width
=
Height
Set a ratio above first

How to Use the Aspect Ratio Calculator

  1. Enter dimensions — type a width and height to instantly calculate the aspect ratio.

  2. Or pick a preset — click 16:9, 4:3, 1:1, or any other common ratio.

  3. Scale to any size — enter either a width or height in the Scale section to get the matching dimension.

What Is the Aspect Ratio Calculator?

The Aspect Ratio Calculator helps you find, convert, and scale aspect ratios. It's useful for video production, web design, photography, and print — anywhere you need to maintain correct proportions when resizing. Enter any two dimensions and it instantly reduces them to their simplest ratio and shows a visual preview.

Frequently Asked Questions

For every 16 units of width, there are 9 units of height. It's the standard widescreen ratio used in most modern TVs, monitors, and YouTube videos.
1:1 for square posts, 4:5 for portrait (takes up more screen space in the feed), and 9:16 for Stories and Reels.
Yes — just enter any width and height in the top section and it will reduce to the simplest ratio.
No. All processing happens entirely in your browser. Your files never leave your device.
Yes, completely free. No signup, no account, no hidden fees.
All modern browsers — Chrome, Firefox, Safari, and Edge on desktop and mobile.