Thanks so much for helping to making my app #6 in Graphics and Design!

Aspect Ratio Calculator allows you to quickly and easily calculate the aspect ratio of a photo, allowing you to easily scale an image for use on blogs, websites and more.

To use, enter the original dimensions of the photo or image on the left hand side of the equation; then, enter the corresponding number that you want to know. For example, if you have an original image that's 2000px x 500px, and you wish to show it in a blog where the space allowed is 500px wide, you'd do the following:

Enter 2000 in the top left box.

Enter 500 in the bottom left box.

Enter 500 in the top right box.

The height will be automatically calculated for you in the bottom left box. In this case, it would be 125.

As a result we know that 2000px x 500px is equivalent to 500px x 125px, and can scale the photo accordingly without worry of creating a misshapen image.

I created this app as there is no easy way to quickly set an aspect ratio as a crop factor in certain graphic applications. This app will allow you to input the known X and Y value, and quickly solve for the unknown X or Y value to ensure that your image stays at the same aspect ratio.

What’s New

Version 1.3.5

Do you know that moment when you realize that while you fixed one bug, you missed another one? Well, that's how I feel right now.

Here's the fun part; the calculations have always been correct. BUT, the UI didn't always update instantly as quickly as your finger could hit the keys on your keyboard and that just isn't good enough for me.

Anyways, I've solved the problem (for good), and apologize (again) for my obvious lack of perfection.

On the plus side, this app is now even more awesome than it was before! That, and I feel kinda silly for fixing one bug and completely missing the inverse of the bug.

Ratings and Reviews

4.7 out of 5
10 Ratings

10 Ratings

Carmine morra ,

for designers

hasn't been updated in five years and runs perfect on Mojave.

when designing for web i use it a bunch.

streettj ,

Insanely Useful

Don't let the age fool you. Runs perfectly on Mojave. It's simple and all it needs to be.

Ben428 ,

Rounds off to the nearest whole number

I was looking for an aspect ratio calculator to help me resize publications, not photos, so I am putting in inches, not pixels. Because this app assumes you are putting in pixels, it rounds off to the nearest whole number, so not useful for me.


David Wolf
1.1 MB

OS X 10.6 or later, 64-bit processor



Age Rating


  • Family Sharing

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