# Pixels Per Inch

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PPI =
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EmilyB.Pixels Per Inch
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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.

#### 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.

PPI=d_p/d_i

where:

• 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