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Open toolAspect Ratio Calculator
Reduce integer width and height by their greatest common divisor; scale height to the target width. Width, height and target width must be whole pixels.
Free to useNo sign-upRuns in your browser
Enter your details
Enter the inputs, then select Calculate aspect ratio.
Your result
Enter your details
Result will appear here
How Aspect Ratio Calculator works
Reduce integer width and height by their greatest common divisor; scale height to the target width.
Width, height and target width must be whole pixels. The target height may be fractional; the rounded pixel height is shown separately.
How to use Aspect Ratio Calculator
Start with your own input.
Enter width
Replace the example with the width you want to process. Width, height and target width must be whole pixels.
Input and settings
Check the settings
Set height, target width. These values determine the result.
Tool result
Run, review and copy
Select Calculate aspect ratio. Review the reduced ratio and proportional target height, then use Copy result or Save result.
Review the details
When to use Aspect Ratio Calculator
Resize a presentation image
To resize a presentation image, start with width. Reduce integer width and height by their greatest common divisor; scale height to the target width.
Plan a video canvas
To plan a video canvas, start with width. Width, height and target width must be whole pixels.
Compare image proportions
To compare image proportions, start with width. Copy the result into your working document, or save a local file for later review.
How to read the result
Check what the output means.
The reduced ratio and proportional target height. Reduce integer width and height by their greatest common divisor; scale height to the target width.
Width, height and target width must be whole pixels. The target height may be fractional; the rounded pixel height is shown separately.
Supported input and limits
Check the format before processing.
Width, height and target width must be whole pixels. The target height may be fractional; the rounded pixel height is shown separately.
Inputs and results are processed locally. Keep your source and save the output you need before leaving.
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Open toolCalculate aspect ratio with your input
Check the result and copy or save the output.
Aspect Ratio Calculator: common questions
Answers about using Aspect Ratio Calculator and understanding its results.
What does the result represent?
The reduced ratio and proportional target height. Width, height and target width must be whole pixels. The target height may be fractional; the rounded pixel height is shown separately.
Can I copy or save the output?
Yes. Use Copy result or Save result after processing. Inputs and results are handled in this browser; save what you need before leaving.