Aspect Ratio Calculator
Find the missing dimension for any aspect ratio.
See how it works
Watch a quick simulation of this tool in action — no file needed.
How to use Aspect Ratio Calculator
Follow these steps — everything happens instantly in your browser.
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Step 1. Choose a preset aspect ratio (or type your own width and height).
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Step 2. Enter either width or height — the other updates to preserve the ratio.
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Step 3. Toggle the link icon to edit dimensions freely without a preset.
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Step 4. See total pixels and a scaled visual preview of the ratio.
Why use this tool
Private by design
All processing happens locally in your browser. Open DevTools → Network and you'll see zero file uploads. Ever.
Instant
No upload wait, no queue, no server round-trip. Results appear the moment you drop a file.
Free & unlimited
No accounts, no watermarks, no daily caps. Use it as many times as you like, forever.
Works everywhere
Desktop, tablet or phone — every tool is responsive and installable as a PWA for offline use.
Frequently asked questions
Everything you might want to know about aspect ratio calculator.
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