Image Aspect Ratio Calculator
Work out an image ratio and scale one side to match it.
Quick answer: enter your details below and click Calculate ratio — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Image & Design
Enter your details below.
How to use
- Enter the image width and height in pixels.
- Optionally enter a new width to scale to.
- Read the simplified ratio and the scaled height.
About this tool
This image-focused calculator simplifies a pixel width and height to their smallest ratio, such as 16:9, and finds the missing height when you scale the width. It works with plain pixel numbers and does not read image files.
Frequently asked questions
What is an aspect ratio?
It is the width-to-height relationship of an image, written in its smallest whole numbers.
Does this resize my image file?
No, it only calculates the numbers; resizing still happens in an editor.