Aspect Ratio Calculator

Calculate aspect ratios and find missing dimensions. Includes common presets like 16:9, 4:3, and 21:9.

Original width

Original height

New width

New height

Original ratio —

New ratio —

Match —

Common preset

Features

Width/height → ratio

Ratio + one side → other side

Common presets (16:9, 4:3, etc.)

Visual preview

1. Type the original width and height.

2. The aspect ratio is shown automatically.

3. Or type a target width to find the matching height (or vice versa).

What is an aspect ratio?

An aspect ratio is the proportional relationship between the width and height of an image or screen.