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At Windows Settings -> System -> Display - Scale and layout, you'll be able to find a dropdown to change percentages for the DPI Scaling.

 

At Computer\HKEY_CURRENT_USER\Control Panel\Desktop there's a LogPixels value.

If your Display DPI is set to 100% it doesn't say 100 though.

If your DPI is set to 125% it says 120. Note: It doesn't say 125.

RegEdit LogPixels Value

 

Does this mean that 125% in reality is 120% ?

karl-police
  • 995

1 Answers1

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The answer is that 125% doesn't mean 120%. But it means 120 DPI. This is because 100% isn't 100 DPI, but 96 DPI instead, and the 125% as a factor bases it off that.

 

At https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/dpi-related-apis-and-registry-settings?view=windows-11#table-2-dpi-scale-factors

It turns out that 125% is the Scale Factor for the DPI, it is NOT the actual raw value for the DPI.

The Settings don't clarify the actual value.

This is a very important detail, as it matters if anyone wants to do manual math or anything.

 

125% is 125% as a percentage for the Scale Factor.

96 DPI is represented as 100%

And the 125% would point to 120 DPI. That's why LogPixels says 120.

 

Microsoft Docs

96 corresponds to 100%, as shown in Table 2 DPI Scale Factors

karl-police
  • 995