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Aspect Ratio Calculator

Simplify dimensions into an aspect ratio, and find a missing dimension for a target ratio.

16 : 9

decimal 1.778

Find a dimension for a target ratio

1440 px

matching height

How to use it

  1. Enter width and height The dimensions to simplify.
  2. Read the ratio Reduced to its simplest form.
  3. Solve a dimension Set a target ratio and a known width.

Examples

1920×1080 16:9
16:9, w 2560 h 1440

About this tool

Aspect ratios describe the shape of a screen, video or image, and the cleanest way to express them is in lowest terms — like 16:9 or 4:3. This calculator simplifies any width and height into that form and shows the exact decimal ratio too.

It also works the other way: give it a target ratio and one dimension, and it returns the matching dimension so you can resize without distortion. Handy for video exports, displays and responsive design. Everything runs in your browser.

Frequently asked questions

How is the ratio simplified?

The width and height are divided by their greatest common divisor, so 1920×1080 becomes 16:9.

How do I resize to a ratio?

Enter the target ratio and one known dimension, and the tool gives the other dimension that keeps the proportions exact.

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Updated June 15, 2026