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Picas to Inches Converter

Enter a value in picas to convert it to inches, millimetres.

How it is calculated

The tool converts desktop-publishing picas, where 1 pica = 12 points = 1/6 inch. The formulas are inches = P × 0.16666667 (the same as P ÷ 6) and mm = P × 4.2333333, where P is the length in picas. Inches are shown with four decimals and millimetres with two. This is the PostScript/DTP pica used by layout software, not the older traditional or Didot-based units of European typography, which are slightly different sizes. The input is a single decimal number, so enter a measure like 13.5 rather than the pica-and-points form 13p6. Negative values are converted with their sign.

Worked example

A column is set 27 picas wide. Inches: 27 × 0.16666667 = 4.5, shown as 4.5000 in. Millimetres: 27 × 4.2333333 = 114.30 mm. The same width in points would be 27 × 12 = 324 pt. If your layout page is 8.5 inches wide, this column takes a little over half of it.

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Common mistakes

  • Mixing up picas and points: 12 points make one pica, so a 12 pt font is 1 pica tall, not 12 picas.
  • Entering pica-and-points notation (13p6) as a single number; convert it to 13.5 picas (13 + 6/12) first.
  • Using the DTP pica for traditional European Didot or cicero measurements, which are a different size and need a Didot converter.
  • Expecting four-decimal precision in millimetres; mm is rounded to two decimals, which is fine for layout but not for tight tolerances.
  • Reading the pica value as inches directly: 6 picas is exactly 1 inch, not 6 inches.

About this calculator

The pica, the traditional unit of typographic measurement, is defined in the modern (PostScript/desktop-publishing) standard as exactly 1/6 inch — and since a pica also splits into 12 points, that makes 1 point = 1/72 inch exactly, the foundation of how font sizes are measured in every design app.

Graphic designers, typesetters and print production professionals think in picas and points when setting column widths, margins and type size in tools like Adobe InDesign and Illustrator, then convert to inches or millimetres whenever a project needs to communicate dimensions to a client or printer using everyday measurement units.

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