Converting from Point Postscript (pt) to Point Didot (dd) | Typography

What is Point Postscript (pt)

Point Postscript (pt) is a unit of measurement commonly used in digital typography to define the size of fonts, spacing, and other elements in a document. It is equivalent to 1/72 of an inch and is widely used in desktop publishing and graphic design.

What is Point Didot (dd)

Point Didot (dd) is another unit of measurement in typography, named after the famous French typeface designer, Firmin Didot. It is commonly used in the printing industry and is slightly different from Point Postscript in terms of size and scale.

Conversion Formulas

By default, 1 (pt) = 0.9383885 (dd) and 1 (dd) = 1.065657 (pt). Other conversions include:

• 13 (pt) = 12.19905 (dd) or 13 (dd) = 13.85354 (pt)
• 4 (pt) = 3.753554 (dd) or 4 (dd) = 4.262627 (pt)
• 5 (pt) = 4.691943 (dd) or 5 (dd) = 5.328283 (pt)

Examples

1. Converting 13 pt to dd:

13pt×0.9383885=12.19905dd

2. Converting 5 dd to pt:

5dd×1.065657=5.328283pt

3. Converting 4 pt to dd:

4pt×0.9383885=3.753554dd

This page provides a simple way to convert between Point Postscript (pt) and Point Didot (dd) for typographers and designers looking to make precise adjustments in their projects.