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Aspect Ratio Calculator

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Calculate image aspect ratios, scale dimensions proportionally, and find the CSS padding-top trick.

Quick presets

Width (px)

Height (px)

Ratio

16:9

Decimal

1.7778

CSS padding-top

56.25%

Scale to new dimension

New width → get height

New height → get width

The CSS padding-top percentage trick is used for responsive aspect-ratio boxes (pre-CSS aspect-ratio support).

How to use Aspect Ratio Calculator

1. Paste or type your input in the box above.
2. The tool processes your input instantly — no button click needed in most tools.
3. Copy the output or download the result.

What is a 16:9 aspect ratio?

16:9 is the standard widescreen format used by most HD and 4K monitors, TVs, and YouTube videos.

Resize images to exact pixel dimensions with an optional aspect ratio lock.

Crop images online with precise pixel controls. No upload needed — works in your browser.

Generate placeholder images at any size with custom colors and text for mockups and prototypes.