Inch to Millimeter Conversion

Convert between Inch and Millimeter quickly and accurately.

From Inch

To Millimeter

How to Convert Inch to Millimeter

Conversion Formula

1 in = 25.4 mm

1 mm = 0.039 in

Example

Convert 15 in to mm:

15 in = 15 × 25.4 mm = 381 mm

Unit Information

Learn about the typography units you're converting between

Inch

Definition

An inch is a unit of length in the imperial system, widely used in typography and print design. One inch equals 1,440 twips, providing a standard reference for print typography and document layout.

History/Origin

The inch has been used since ancient times and was standardized in the imperial system. It became fundamental to typography and printing, especially in English-speaking countries and print industries.

Current Use

Inches are extensively used in typography for print design, page layout, font sizing, and document formatting, particularly in the United States and other countries using imperial measurements.

Multiplier

1440

Offset

Millimeter

Definition

A millimeter is one-thousandth of a meter, providing fine precision for typographic measurements. One millimeter equals 56.6929133858 twips, offering detailed control over text positioning and spacing.

History/Origin

The millimeter is a metric unit derived from the meter, providing a practical scale for precise measurements in engineering, manufacturing, and design applications, including typography and graphic design.

Current Use

Millimeters are used in typography for precise measurements of font sizes, line spacing, margins, and other typographic elements, particularly in professional publishing and technical documentation.

Multiplier

56.693

Offset