Calculate Image Dimensions for Web

Ensure images fit their containers perfectly — find the right width and height for any layout.

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Width (px)

Height (px)

Simplified ratio16:9

Decimal ratio1.7778:1

Named ratio16:9

Megapixels2.07 MP

16:9

Common dimensions

Web tips

🖼️

If your CSS container is 800px wide and you want a 16:9 image, calculate the height: 800 / 16 × 9 = 450px. This tool does that for you.

💡

Using aspect-ratio CSS? The tool shows the simplified ratio (e.g. 8:5) which you can use directly in aspect-ratio: 8/5 in CSS.

📐

For responsive images, calculate at your largest breakpoint, then CSS handles the scaling. The ratio stays the same at all widths.

🚀

Always specify width and height attributes on <img> tags (matching the image's natural ratio) to prevent Cumulative Layout Shift (CLS).

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Enter your data into the tool above. Everything stays local to your browser.

Proses

The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

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Get your result instantly. Nothing is stored after you leave the page — complete privacy.

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