Web Design Aspect Ratio Calculator

Web Design Aspect Ratio Calculator Reference Table

Use this table for fast validation of screen and web design ratios before implementation. It helps reduce mismatch between design intent and final display behavior.

Tip: on smaller screens, swipe horizontally to view the full table.

Practical Tips

• Add width and height attributes to every img element so browsers reserve layout space before the image loads, preventing Cumulative Layout Shift.
• Export separate OG and Twitter card files: Facebook uses 1.91:1 (1200x630), X uses 2:1 (1200x600). One image can be cropped, but separate exports give cleaner results.
• Use the CSS aspect-ratio property (for example, aspect-ratio: 16 / 9) on image containers rather than the older padding-top percentage technique, which all modern browsers support natively.
• Keep essential text and logos within the central 80% of hero and banner images to survive responsive cropping at narrower viewports.
• Preview share cards with platform debuggers before major launches to confirm the correct image and metadata is being pulled.

For cross-device and cross-platform delivery, define primary and secondary aspect ratios before design production begins. This avoids rushed crops and improves visual consistency in real-world usage.

A ratio-first workflow also helps engineering and content teams align early, especially when assets must support both app UI and marketing surfaces.

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