Pixels Per Inch

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Equation / Last modified by KurtHeckman on 2018/11/24 22:08
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EmilyB.Pixels Per Inch
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792b8d85-55be-11e6-9770-bc764e2038f2

The Pixels Per Inch calculator compute the pixels per inch based on the diagonal resolution and the diagonal length of a screen.

INSTRUCTIONS: Choose units and enter the following:

  • (dp) This is the diagonal resolution in pixels
  • (di) This is the diagonal length

Pixels Per Inch (PPI):  The calculator returns the number of pixel density.

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The Math / Science

Pixels per inch  is a measurement of the pixel density (resolution) of an electronic image device, such as a computer monitor or television display, or image digitizing device such as a camera or image scanner. Horizontal and vertical density are usually the same, as most devices have square pixels, but differ on devices that have non-square pixels. 

The formula for pixels per inch is: 

      `PPI=d_p/d_i`

where:screenPixelresolution.png

  • PPI = pixels per inch
  • dp = diagonal resolution in pixels (to calculate: `d_p=sqrt(w_p^2+h_p^2)`)
  • di =  diagonal size in inches

References