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My laptop is HP 250 G2 with 15.6” diagonal LED-backlit HD2 anti-glare (1366 x 768). Please How do I know the dpi value?

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    For you It would be 100 ppi/dpi. Calculated using this website. – TheKB Jun 15 '16 at 18:41
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1366 x 768 pixels is 1567 pixels diagonally (Pythagorean theorem, √(13662+7682)=1567; and you thought you would never use that).

If the screen measures 15.6" diagonally, 1567 pixels / 15.6" is approximately 100 pixels per inch.

You won't get an exact PPI number unless the manufacturer publishes it or you measure the screen. The advertised diagonal measurement is often a nominal number and may include a little of the display panel behind the bezel.

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    Never thought pythagorean theorem has something to do with displays! – Mohammed Shareef C Jun 13 '17 at 6:58
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    Pythagorean theorem has everything to do with Euclidean spaces, such as monitor surface – amuliar Dec 29 '17 at 17:32
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Assuming you are using Windows 7:

  • Go to Control Panel > Appearance and Personalization > Display
  • In the left(blue) column, click Set custom text size(DPI)

A window titled Custom DPI Scaling will pop up. It will show what percent of the "normal size"(default monitor DPI) it is scaled to and will allow you to adjust it.

You should see a ruler in the middle. Below that it will say 9 point Segoe UI at X pixels per inch.

The X is your current DPI.

  • Which version of windows? Mine says "9 point Segoe UI" rather than at X pixels per inch. – Journeyman Geek Jun 5 '16 at 23:31
  • Windows 7. The exact message it says on my computer is "9 point Segoe UI at 144 pixels per inch" – Anonymous Jun 8 '16 at 23:09
  • Might be worth mentioning the version then. Its not there in windows 10. – Journeyman Geek Jun 8 '16 at 23:20
  • OK. Updated my answer. – Anonymous Jun 9 '16 at 0:59
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as of DPI Calculator

  • Display size: 13.6" × 7.65" = 103.96in² (34.54cm × 19.42cm = 670.72cm²)
  • DPI = PPI = 100.45
  • 0.2529mm dot pitch, 10091 PPI²
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Try yourself: DPI Calculator

Formula:

PPI = √(pixels_horizontal^2 + pixels_vertical^2) / inches_diagonal

PPI = √(13662 + 7682) / 15.6 = 100.45

Therefore, 100.45 dpi

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