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Aspect Ratio Calculator

Simplify ratios, apply social presets and preview crop lines live.

Aspect ratio

16:9

Decimal value

1.78

Orientation:Landscape

History (last 5)

  1. No calculations yet.

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Built with privacy in mind. All processing happens entirely in your browser using open-source libraries.

What is the Aspect Ratio Calculator?

An aspect ratio is the proportional relationship between a width and a height. This calculator reduces any two numbers to their simplest ratio, shows the decimal value, and applies ready-made presets for YouTube, Instagram, X, TikTok and more.

Every social platform crops content to its own dimensions. A wrong ratio means cropped faces, cut-off captions or stretched images. The live preview draws the crop lines over a canvas so you can see exactly what stays inside the frame before you export.

How to use the Aspect Ratio Calculator?
  1. Type a width and height, or pick a preset.
  2. Read the simplified ratio and decimal value instantly.
  3. Watch the preview overlay to see how the crop lines behave.

Frequently Asked Questions (FAQ)

Is the Aspect Ratio Calculator free?

Yes, free with no signup or limits.

Which presets are included?

YouTube, Instagram (post, reel and portrait), X/Twitter, LinkedIn, Facebook, TikTok and Pinterest.

Can I use decimal ratios?

Yes, the decimal value is shown next to the simplified ratio.

How does the live preview work?

A canvas draws the frame plus rule-of-thirds crop lines so you can see how a 16:9 or 9:16 crop behaves.

Can I copy the ratio as CSS?

Yes; "Copy CSS" gives aspect-ratio: w / h; and "Copy Tailwind" gives aspect-[w/h].

Is my history stored privately?

Yes; history stays in your browser's localStorage — no uploads, no signup, private.