# What are 21

## Convert 21.5 inch monitor to cm

Updated on by Stefan Banse

It is often very difficult to keep track of all common monitor sizes. The displays are classified in inches based on their screen diagonals. A common format is 21.5 inches. But also diagonals in 24 ", 27" or even 30 "are no longer uncommon. The high resolution, especially in the 16: 9 format, allows the use of large screens without unnecessarily straining the eyes. Let us now consider all 21.5" devices : What are the real dimensions of a 21.5 inch screen? First the most important information:

21.5 inches to cm is exactly 54.61 cm

This is the screen size of the monitor. Use our online calculator to determine other screen sizes:

### How big is a 21.5 inch monitor?

We have now learned that the screen diagonal on 21.5 inch devices is approximately 54.61 centimeters. To classify this size, you need the actual dimensions of the screen (width x height) in centimeters. Important: We are assuming a screen with a 16: 9 ratio. The specific dimensions are:

Width: 49.6 cm
Height: 29.2 cm
Diagonal: 54.61 cm (21.5 ")

### Monitor sizes in comparison

Our diagram provides an overview of the common monitor formats based on the 16: 9 aspect ratio. Feel free to compare this size with a 24 inch monitor or a 27 inch monitor.

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### References

In particular, we used the information from the following sources for the topic "Length units":

### Last update on April 14th, 2021

The pages of the theme world "Units of Length" were last editorially checked on April 14th, 2021 by Stefan Banse. They are all up to date.

### Previous changes on 11/20/2020

• November 20, 2020: Extension to include advice articles on 55 inch TVs, 60 inch, 65 inch or even 75 inch TVs
• Editorial revision of all texts in this subject area