Screen PPI Calculator

Calculate screen pixels per inch from resolution and diagonal size. Enter your own values below to see pixel density and check the method behind it.

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Your inputs

Change the example values to match your situation.

Your result

Let’s work it out.

Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

PPI = √(horizontal pixels² + vertical pixels²) ÷ diagonal inches.

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What is Screen PPI Calculator?

Screen PPI Calculator helps you calculate screen pixels per inch from resolution and diagonal size.

The main result is pixel density. The formula, example and assumptions below explain how to interpret it.

How to use Screen PPI Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather horizontal pixels, vertical pixels and screen diagonal (inches). Use values from the same situation or reporting period.
  2. Replace the example horizontal pixels with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read pixel density. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter horizontal pixels, at least 0. Decimals are accepted.
  • Enter vertical pixels, at least 0. Decimals are accepted.
  • Enter screen diagonal in inches, at least 0.001. Decimals are accepted.

Screen PPI Calculator: a worked example

With the inputs below, the result is 91.787799 PPI (pixel density). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Horizontal pixels1,920
Vertical pixels1,080
Screen diagonal (inches)24 inches
Pixel density91.787799 PPI

Understanding the Screen PPI result

The main output is pixel density, expressed in PPI. It applies to the inputs and operation you selected.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

Screen PPI Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • Match numerators and denominators from the same reporting period. Creator RPM is revenue per thousand views, while advertiser CPM measures spending.

For wider guidance, visit Google Ads Help. The formula and scope of this specific tool are stated on this page.

Screen PPI Calculator FAQs

What does Screen PPI Calculator calculate?

Screen PPI Calculator helps you calculate screen pixels per inch from resolution and diagonal size. Its main output is pixel density in PPI.

What inputs do I need for Screen PPI Calculator?

You need horizontal pixels, vertical pixels and screen diagonal (inches). Use the field labels and units to match your figures to the formula.

Which formula does Screen PPI Calculator use?

PPI = √(horizontal pixels² + vertical pixels²) ÷ diagonal inches.

What is a worked example for Screen PPI Calculator?

Example inputs: Horizontal pixels: 1,920; Vertical pixels: 1,080; Screen diagonal: 24 inches. The result is 91.787799 PPI (pixel density).

How should I enter horizontal pixels?

Enter horizontal pixels, at least 0. Decimals are accepted.

How do I choose vertical pixels?

Enter vertical pixels, at least 0. Decimals are accepted. The example uses 1,080; replace it if your circumstances differ.

How should I read pixel density?

The main output is pixel density, expressed in PPI. It applies to the inputs and operation you selected.

Why might my Screen PPI Calculator result differ from my records?

Match numerators and denominators from the same reporting period. Creator RPM is revenue per thousand views, while advertiser CPM measures spending. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in Screen PPI Calculator?

Yes. Note your first pixel density, change horizontal pixels or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is Screen PPI Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.