Aspect Ratio Calculator
Simplify a width and height into their aspect ratio (e.g. 1920×1080 → 16:9), or solve for a missing width or height given a target ratio. Free and private, right in your browser.
Find the ratio
Solve a missing dimension
Punch in any two dimensions or a ratio like 16:9 and this tool simplifies it or solves for the missing width/height, handy for scaling images, sizing video exports, or cropping a photo without distorting it.
How to use it
- Enter a known width and height, or a ratio like 16:9
- Add the one dimension you're solving for
- Read off the simplified ratio or calculated value instantly
Frequently asked questions
- How do I find a missing value, like width when I know height and ratio?
- Enter the ratio (e.g. 16:9) and one known dimension. The calculator solves for the other automatically, so typing height 1080 with ratio 16:9 gives you width 1920.
- What's the simplified form of an odd ratio like 1920:1200?
- The calculator reduces it to lowest terms using the greatest common divisor, so 1920:1200 simplifies to 8:5.
- Does it work for non-screen uses like print or photo cropping?
- Yes. It's just ratio math, so it works equally well for print sizes, frame dimensions, or crop proportions, not only video/screen resolutions.
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Nothing is uploaded
The file never leaves your device. There is no server to send it to, so there is nothing to leak, log, or subpoena.
- 2
No signup, no limits
No account, no email, no daily cap, no watermark, and no paid tier waiting behind the third file.
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Works offline
Load the page once and it keeps working with the network off, because all the work was always happening locally.