📐Aspect Ratio Calculator
Find ratios and resize dimensions.
About the Aspect Ratio Calculator
Calculate the aspect ratio of any width and height, and find the missing dimension when resizing while keeping the ratio. Free online aspect ratio calculator.
How to use the Aspect Ratio Calculator
- 1Paste your input into the Aspect Ratio Calculator above.
- 2Configure any options for your use case.
- 3Copy the formatted or generated output.
- 4It all runs client-side, so your data never leaves the page.
Why use this tool?
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Private by design
The Aspect Ratio Calculator runs entirely in your browser — nothing you enter is uploaded to a server.
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Free, no signup
Use it as much as you like. There's no account, no paywall and no watermark.
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Fast & instant
Results appear the moment you type or click — no waiting, no page reloads.
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Works anywhere
Any device or browser, even offline once the page has loaded.
Frequently asked questions
What can this calculate?＋
It simplifies any width:height into a ratio, and finds the missing dimension when you resize while keeping the same ratio.