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Aspect Ratio Calculator
An aspect ratio describes the relationship between width and height, so scaling one dimension requires scaling the other by the same factor. That is why resizing a video without preserving the ratio stretches or crops the image.
How it works
Known width
Ratio width part
Ratio height part
Target width
Known height
Height for that width
Decimal ratio
Height for the target width
Ratio from your dimensions
Closest common format
Pixel area
Frequently asked questions
How do I use the Aspect Ratio Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.