Aspect Ratio Calculator
Calculate and simplify aspect ratios. Find missing dimensions from a given ratio, and preview the rectangle visually.
| Ratio | Common Use |
|---|---|
| 16:9 | Widescreen monitors, YouTube, TV |
| 4:3 | Classic TV, iPad, presentations |
| 1:1 | Instagram, social media profile |
| 21:9 | Ultrawide monitors, cinema |
| 9:16 | Vertical video, stories, reels |
| 3:2 | Photography, MacBook display |
| 5:4 | Older monitors, print (8x10) |
| 2:1 | Univisium, 18:9 mobile |
| 32:9 | Super ultrawide monitors |
How to Use This Aspect Ratio Calculator
Enter the width and height of your image, video, or screen, and the tool instantly calculates the simplified aspect ratio. For example, entering 1920 x 1080 gives you 16:9. You can also work in reverse: enter a target aspect ratio and one dimension (width or height), and the calculator finds the missing dimension. This is invaluable when resizing images or videos while maintaining their proportions, or when designing responsive layouts that need to fit specific aspect ratios.
Common Aspect Ratios
The most widely used aspect ratios include 16:9 (standard widescreen for monitors, TVs, and YouTube), 4:3 (classic TV and iPad), 1:1 (square, common in social media), 21:9 (ultrawide monitors and cinematic film), 9:16 (vertical video for mobile and stories), and 3:2 (common in photography and laptops). The reference table in the tool shows these and more with their typical use cases.
Frequently Asked Questions
Is this tool free?
Yes, completely free with no limitations or sign-up required.
How is the ratio simplified?
The tool divides both the width and height by their greatest common divisor (GCD) to produce the simplest integer ratio.
Is my data private?
Yes, all calculations happen entirely in your browser. No data is sent to any server.