Display Calculators
OS scaling effective resolution.
Enter the native resolution and the scale percentage set in your operating system to see the effective resolution the interface lays out in, the logical DPI, and a table of common scales. Runs in your browser; nothing is sent or stored.
Inputs
Result
Fill the form and press Calculate.
Worked example
A 3840 x 2160 screen at 150% scaling lays the interface out as 3840 / 1.5 x 2160 / 1.5 = 2560 x 1440, with a logical DPI of 96 x 1.5 = 144. At 125% it is 3072 x 1728. On a 27 inch panel the physical density is 163.2 PPI.
How it works
Effective resolution = native resolution / (scale / 100). The High DPI Desktop Application Development on Windows - Win32 apps | Microsoft Learn document notes that most displays historically had 96 pixels per linear inch, which is 100% scaling, and that apps which are not DPI aware are stretched, which can make them look blurry. So logical DPI = 96 x scale / 100.
The effective resolution is the amount of room the interface has; the physical pixels stay the same. It is arithmetic on the numbers you enter.
Sources: High DPI Desktop Application Development on Windows - Win32 apps | Microsoft Learn. Each opened 2026-10-08.
Planning guide only, not professional advice. Figures are estimates from the inputs you enter.
FAQ
What resolution is 4K at 150 percent scaling?
It lays out like 2560 x 1440.
What is 4K at 125 percent scaling?
About 3072 x 1728 effective pixels.
What does 200 percent scaling mean?
The interface is drawn twice as large in each direction, so a 3840 x 2160 screen lays out like 1920 x 1080 with four physical pixels for each one.
What is logical DPI?
It is 96 x the scale percentage / 100. Windows documentation treats 96 DPI as 100 percent scale.
Can scaling make apps look blurry?
Apps that are not DPI aware are stretched, which the Microsoft documentation says can make them appear blurry.