Free · no signup · browser-local
Image Aspect Ratio Calculator for Resizing
Enter the original image dimensions and a new width to find the matching height in pixels, simplified aspect ratio and scale percentage.
Input and settings
LOCALRatio: 16:9 New size: 1280 × 720 px Scale: 66.67%
Getting started
Enter original width, height and a new width.
Before you use the result
Rounding to whole pixels can introduce a tiny ratio difference.
Try an example
Scale 1920 × 1080 to width 1280.
How it works
Greatest common divisor gives the simplified ratio.
Frequently asked questions
Scale image dimensions without stretching their aspect ratio.
How do I use Aspect Ratio Calculator?
Enter original width, height and a new width.
Does this tool upload my data?
Inputs and files are processed in your browser. Page-view analytics do not contain your tool input.
What should I check before using the result?
Rounding to whole pixels can introduce a tiny ratio difference.