Picas to Inches (pc to in)

1 pica equals 0.1666666667 inches (rounded).

1 pica = 0.1666666667 inches

How to convert picas to inches

To convert picas to inches, multiply the number of picas by 0.1666666667. The factor is rounded to 10 significant digits. To go the other way, multiply inches by 6.

inches = picas × 0.1666666667

Example: 10 picas = 1.666666667 inches.

About these units

Pica (pc)

Typography & screenCurrent unit

12 points, or one sixth of an inch (4.2333 mm). A printing measure, used in layout software.

Anyone who sets column widths in a layout program meets the pica, a printing measure divided into 12 points. Its size has varied by country. The French cicero equals 12 Didot points, about 4.512 mm. The American pica set by type founders in 1886 is about 4.217 mm (0.16604 inch), and the TeX pica is 400/2409 inch.

The figure used here is the desktop publishing pica, exactly one sixth of an inch or about 4.233 mm, which equals 12 of the 1/72 inch points. NIST lists the computer pica as an exact conversion. Six picas make an inch, and CSS uses the abbreviation pc for it. Adobe InDesign and QuarkXPress write measurements as picas and points, so 5p6 means five and a half picas. Designers also count characters per pica to fit text: 11 point Helvetica has about 2.4, so a 30 pica line holds roughly 72 characters. The Wikipedia article does not explain where the name came from.

1 pica = 0.004233333333 meters (approximately).

Sources: Wikipedia: Pica (typography); Wikipedia: Point (typography); NIST Guide to the SI, Appendix B.8

Inch (in)

US & ImperialCurrent unit

1/12 of a foot. Defined as exactly 25.4 millimeters since 1959, when the US and Commonwealth countries agreed a common international inch.

Latin uncia, meaning one-twelfth, is the root of both inch and ounce, and it passed into Old English as ynce. Roman measurers divided their foot into twelve unciae, and the English inch kept that twelfth. After 1066 an inch was reckoned as three barleycorns, and a 1324 statute attributed to Edward II spelled out the definition as three grains of barley, dry and round, placed end to end lengthwise. For centuries the inch was simply a twelfth of a foot, or a thirty-sixth of a yard, and the US and UK each kept their own copy of the standard yard.

Those copies differed slightly until the 1959 international agreement fixed the yard at exactly 0.9144 meter, which made the inch exactly 25.4 millimeters. The US adopted it in 1959 and the UK ratified it in 1963, effective 1964. Today the inch is still the customary unit in the United States and Canada, and the UK keeps it on road signs. Worldwide it also names display diagonals, wheel rims, tire codes and pipe sizes.

1 inch = 0.0254 meters (exactly).

Sources: Wikipedia: Inch; Wikipedia: Yard; NIST Guide to the SI, Appendix B.8: conversion factors

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