Easily find and calculate the dimensions of anything.

Have you ever had to adjust the size of an image and not known what to select for the width or height to maintain the original’s aspect ratio.

Activate Aspect Ratio Calculator by selecting an image or a portion of your screen and you’ll get the dimensions back along with the aspect ratio calculated. Adjust for your desired output’s width, height or scale and you’ll have the other dimensions adjusted to match and maintain the proportions of the original size.

To see a video of the app in action visit

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What’s New

Version 1.3

Dark Mode!

Ratings and Reviews

3.0 out of 5
7 Ratings

7 Ratings

Patrick_H ,

Simple & useful, but it needs to provide users with control over shortcuts

This is the fastest, simplest way to accomplish something I have to do several times per week.

I would rate it as a 5-star app if not for one problem it has caused. It includes two shortcuts and does not provide a way to customize them or turn them off. Control-O is reserved for opening an image and Control-C is used to select portions of the screen. I already had Control-O and Control-C set for other universal shortcuts on my Mac. Changing those is a pain because they are part of a large set of customized Control- shortcuts. I either need to change my shortcuts or only run Aspect Ratio Calculator when I need it; yet, it’s the kind of app that is most useful if it’s always available. Although I use shortcuts a lot, I’d prefer to use the menu for these two functions in Aspect Ratio Calculator.

azwiki ,

Doesn't work for me - crashed at lanch.

Tried on Mac-mini with 10.9.5 and can’t lanch this app:
7/16/15 4:02:39.283 PM Aspect Ratio Calculator[49696]: Invalid color System, labelColor (warning given only once)
7/16/15 4:02:39.505 PM WindowServer[143]: CGXSetWindowListSystemAlpha: Invalid window 7940 (index 0/1)
7/16/15 4:02:41.611 PM[365]: (com.bridgetech.aspect-ratio-calculator.87680[49696]) Job appears to have crashed: Segmentation fault: 11

DaveCarLit ,

Won’t Lanch

Aspect Ratio Calculator won’t launch under Mavericks. Try to launch it and it accesses a couple unrelated web sites (Little Snitch), puts an icon on the menu bar momentarily and the icon goes away. Nothing happens. Is this a menu bar app and I don’t know how to start it? Confused.


6 MB
Developer Tools

OS X 10.11 or later, 64-bit processor



Age Rating
Rated 4+
© Mark Bridges 2014


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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