# Aspect Ratio Calculator

## Calculate the aspect ratio to match any custom width and height combination.

### 16:9 Ratio Calculator

Width: px / cm / inch
Height: px / cm / inch

## Understanding ratio 16:9

A 16:9 ratio (also pronounced “16 9”, “16 to 9”, or “16 by 9” and sometimes written as “16x9”) is an aspect ratio, where for every 16 units of width, there are 9 corresponding units of height. Examples of 16:9 ratios are 16 inches wide by 9 inches high, 32 widgets wide by 18 widgets high, and 1920 pixels wide by 1080 pixels high. An image has a 16:9 ratio if its width-to-height ratio is equal to 16/9, or 1.78. A 16:9 ratio can also be represented as 1.78:1. 16:9 is significant because it is today’s standard ratio for film and display. The 16:9 ratio replaced the old 4:3 ratio in the early 2,000s. You may have heard terms such as 1080p HD, 720p HD, and 4K UHD. These terms all refer to 16×9 ratios. For example, a 1080p HD display refers to a screen resolution of 1920x1080p (1920/1080 = 1.78).

## How to use?

### How to calculate a Custom Size

1. Insert the first value (width or height).
2. Select a preset, or insert the other value.

### How to use a Preset Size

1. Select a preset from the list, for example 16:9 or 4:3.
2. Insert one of the values: width or height.

The aspect ratio of an image defines the proportion between its width and height. It is always expressed as two numbers separated by a colon `x:y`.