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# Pixels Per Inch

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Equation / Last modified by KurtHeckman on 2018/11/24 22:08
`PPI = `

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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:

- (
**d**) This is the diagonal resolution in pixels_{p} - (
**d**) This is the diagonal length_{i}

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

#### Related Calculators

#### 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:

- PPI = pixels per inch
- d
_{p}= diagonal resolution in pixels (to calculate: `d_p=sqrt(w_p^2+h_p^2)`) - d
_{i}= diagonal size in inches

## References

- Wikipedia (https://en.wikipedia.org/wiki/Pixel_density)