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Monitor Size Calculator

Converts a screen diagonal and aspect ratio into actual width and height, with pixel density and a comfortable viewing distance.

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Enter your figures and press Calculate.
In short Monitor Size Calculator is a free online tool on inputtesthub.com that converts a screen diagonal and aspect ratio into actual width and height, with pixel density and a comfortable viewing distance. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Monitor Size Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Monitor Size Calculator

The Monitor Size Calculator converts a screen diagonal and aspect ratio into actual width and height, with pixel density and a comfortable viewing distance. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Checking whether a monitor fits a desk before buying.
  • Comparing a 34" ultrawide against a 27" 16:9.
  • Finding whether a resolution will look sharp at that size.

Details

27" 16:923.5" × 13.2"
34" 3440 × 1440 ultrawide31.4" × 13.1"
Comfortable PPI90–110
Below 80 PPIPixels visible

The maths behind it

This tool uses Width and height are derived from the diagonal and the aspect ratio using Pythagoras. PPI = diagonal resolution in pixels ÷ diagonal in inches. Every intermediate value is shown on screen, so the result can be checked by hand.

Diagonal alone tells you very little. A 34" ultrawide with the usual 3440 × 1440 panel is about the same height as a 27" 16:9 screen, 13.1 against 13.2 inches, and has less screen area than a 32" 16:9, because the aspect ratio decides how the diagonal is divided.

Explained in our guides

All guides

Frequently asked questions

How wide is a 27 inch monitor?
A 27" 16:9 screen is about 23.5 inches (59.8 cm) wide and 13.2 inches (33.6 cm) tall, excluding the bezel. Enter any diagonal and ratio above for the exact figures.
Is a 34 inch ultrawide bigger than a 27 inch monitor?
Wider, and about the same height. A 34" ultrawide with the usual 3440 × 1440 panel is about 31.4" × 13.1", against 23.5" × 13.2" for a 27" 16:9, so you gain nearly 8 inches of width and lose about a tenth of an inch of height. The 21:9 option above uses the rounded ratio in the name, which comes out slightly taller (13.4"); a 3440 × 1440 panel is really 43:18.
Is the Monitor Size Calculator free, or is there a paid tier?
It is free, with no account, no trial and no daily cap. Every calculators tool on inputtesthub.com works the same way: open the page and use it.
Is what I paste into the Monitor Size Calculator stored?
No. The Monitor Size Calculator runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What is the equation behind the Monitor Size Calculator?
It uses Width and height are derived from the diagonal and the aspect ratio using Pythagoras. PPI = diagonal resolution in pixels ÷ diagonal in inches. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What do people use the Monitor Size Calculator for most?
The most common reasons people reach for it: checking whether a monitor fits a desk before buying. Comparing a 34" ultrawide against a 27" 16:9. Finding whether a resolution will look sharp at that size. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything to watch out for?
Diagonal alone tells you very little. A 34" ultrawide with the usual 3440 × 1440 panel is about the same height as a 27" 16:9 screen, 13.1 against 13.2 inches, and has less screen area than a 32" 16:9, because the aspect ratio decides how the diagonal is divided.
Which values should I know?
27" 16:9 is 23.5" × 13.2". 34" 3440 × 1440 ultrawide is 31.4" × 13.1". Comfortable PPI is 90–110. These are printed on the page itself, so you do not have to take them on trust.
How precise is the result?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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