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- Letter Fold
Formatting for Postal Guidelines
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A letter fold divides the sheet in three roughly equal parts. Each fold is to the same side with one of the end panels being tucked inside the others.
To fit inside, this panel needs to be slightly narrower than the others. We recommend decreasing its width by approximately half of a pica (6 pt), adding a quarter pica (3 points) to the width of the other two panels.
These figures show how you should set up your layout for a U.S. letter page in wide orientation, measured in picas and points. (1 pt = 1/72")
Measurement conversions:
Picas, points
Inches
Millimeters
0p3 .041667 1.05833 0p6 .083333 2.11666 21p6 3.58333 91.0165 22p3 3.70833 94.1916 43p9 7.29167 185.208 44p6 7.41667 188.383 66p0 11.0000 279.400 This is based on modern "PostScript" points where 72pt is exactly one inch. "Traditional" printer's points are slightly smaller. Most software, based on PostScript, uses the exact 72-per-inch definition.