Aspect Ratio Calculator
Calculate the aspect ratio of any image or screen, simplify a ratio like 1920x1080 to 16:9, and find a missing width or height — free online. — free, fast and private.
Your result will appear here.
How to use Aspect Ratio Calculator
- Enter the width and height in pixels (for example 1920 x 1080).
- Click Calculate Ratio to see the simplified ratio.
- Optionally enter a new width to find the matching height at the same ratio.
Note: this tool runs in your browser. Nothing is uploaded.
Frequently Asked Questions
How is aspect ratio calculated?
Divide both the width and the height by their greatest common divisor. For example, 1920 and 1080 share a greatest common divisor of 120, so 1920:1080 simplifies to 16:9.
Is this tool free to use?
Yes, it is 100% free with no sign-up. Your data stays in your browser.
Is my data uploaded or stored?
No. This tool runs entirely in your browser — nothing you enter is uploaded to a server.
Can I use it on my phone?
Yes, it is fully mobile-friendly and works in any modern browser on phone, tablet or computer.