Pixel per Inch to Dot per Millimeter Conversion

Convert between Pixel per Inch and Dot per Millimeter quickly and accurately.

From Pixel per Inch

pixel/in

To Dot per Millimeter

dot/mm

How to Convert Pixel per Inch to Dot per Millimeter

Conversion Formula

1 pixel/in = 0.039 dot/mm

1 dot/mm = 25.4 pixel/in

Example

Convert 15 pixel/in to dot/mm:

15 pixel/in = 15 × 0.039 dot/mm = 0.591 dot/mm

Unit Information

Learn about the digital image resolution units you're converting between

Pixel per Inch

pixel/in

Definition

The Pixel per Inch is an imperial unit of digital image resolution, numerically equivalent to dots per inch. It specifically refers to the number of pixels per inch of linear measurement, emphasizing the digital nature of the measurement in contrast to traditional printing dots, though the values are identical.

History/Origin

This unit emerged with the development of digital displays and computer graphics, where "pixel" became the standard term for digital picture elements. It provides a clear distinction between digital pixel-based measurements and traditional printing dot measurements, though they represent the same resolution value.

Current Use

Primarily used in digital display technology, computer graphics, and web design for specifying screen resolution and image display quality. It is commonly used in software interfaces, digital camera specifications, and display device specifications to indicate pixel density and image sharpness.

Multiplier

39.37

Offset

Dot per Millimeter

dot/mm

Definition

The Dot per Millimeter is a metric unit of digital image resolution, equal to 1,000 dots per meter. It represents the number of dots or pixels per millimeter of linear measurement, providing a more convenient scale for high-resolution digital imaging applications where millimeter precision is required.

History/Origin

This unit was developed as a practical metric alternative to inch-based resolution measurements, particularly useful in countries using the metric system. It provides a direct relationship to the base meter unit while offering a more manageable scale for high-resolution digital imaging and printing applications.

Current Use

Commonly used in high-resolution digital imaging, precision printing, and scientific imaging applications where millimeter-level precision is important. It is particularly useful in medical imaging, scientific photography, and high-quality printing where detailed resolution measurements are critical.

Multiplier

1000

Offset