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How-To Geek

Dots Per Inch (DPI)

DPI is a common term used primarily in regard to printers and their output. It stands for Dots Per Inch and represents the resolution number of dots per inch in digital printing. The actual print resolution can be calculated by squaring the DPI number. Thus a printer with 100 DPI rating is capable of printing 10,000 dots per square inch, and a printer with a 1200 DPI rating is capable of printing 1,440,00 dots per square inch.

The type of printer significantly influences the maximum DPI. A dot-matrix printer typically cannot print higher than around 60 DPI, inkjet printers typically have around 300-600 DPI, and laser printers, by the nature of the electrostatic charges that apply the toner to the paper, can achieve upwards of 1800 DPI.

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