For many, the measurement system of choice for typesetting and publication design is picas and points.
- A point is a unit of measurement that is the standard for measuring type and is used for measuring depth of printing. One point is equal to .013836 of an inch and 72 points are approximately 1 inch.
- A pica is a typesetting unit of measurement commonly used for measuring lines of type. One pica equals 12 points. There are 6 picas to an inch.
- A standard US letter size page is 8.5 by 11 inches or 51 by 66 picas. (6 picas are approximately 25 mm)
- The letter p is used to designate picas as in 22p or 6p. With 12 points to the pica, half a pica would be 6 points written as 0p6. 17 points would be 1p5 (1 pica = 12 pts, plus the leftover 5 pts).