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).

Inserisci

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

Elabora

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

Scarica

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

✓Completamente gratuito — nessun costo nascosto, mai

✓Nessun account, email o accesso richiesto

✓I file non lasciano mai il tuo dispositivo

✓Assolutamente nessun limite di dimensione file

✓Nessuna filigrana su nessun output

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