Screen PPI Calculator
Calculate screen pixel density from resolution and diagonal screen size.
How to use Screen PPI Calculator
1. Enter Horizontal Pixels, Vertical Pixels, Diagonal Size Inches. 2. Use the active rectangular display diagonal in inches. Bezel dimensions, viewing distance and perceived sharpness are excluded. 3. Select Calculate or press Enter. 4. Select Copy result to copy the answer, or Reset to clear the form and result.
Why use this tool?
Use the active rectangular display diagonal in inches. Bezel dimensions, viewing distance and perceived sharpness are excluded.
How the calculation works
Screen PPI = square root(horizontal pixels² + vertical pixels²) ÷ diagonal inches. Use the active rectangular display diagonal in inches. Bezel dimensions, viewing distance and perceived sharpness are excluded. Counts and dimensions use the declared rounding convention; other numbers display up to three decimal places where applicable. Nonzero subsecond durations are labelled. Durations round to the nearest second; nonzero subsecond durations are labelled. File-size output units are decimal. Changing an input label does not convert filled values.
Example
Worked example: Horizontal Pixels = 3000; Vertical Pixels = 4000; Diagonal Size Inches = 10. Result: 500 PPI.
Practical tip
Check the input labels and assumptions against the screen ppi task before reusing the number.
Frequently asked questions
What exactly does Screen PPI Calculator calculate?
Screen PPI = square root(horizontal pixels² + vertical pixels²) ÷ diagonal inches.
Which units or counting rules apply?
Use the active rectangular display diagonal in inches. Bezel dimensions, viewing distance and perceived sharpness are excluded.
Does this inspect, change or upload my files?
This page calculates the entered values or text in the browser. Numeric image/media tools do not transform files. Check the worked example and stated counting basis; the result does not certify device, search-engine or accessibility outcomes.