Convert from fod to hair's breadth

Unit Definition (fod)
The fod is the traditional Danish foot, equal to about 12.365 inches or 31.41 centimeters.

Unit Definition (hair's breadth)
The hair's breadth is a common informal unit of distance. Human hairs vary considerably in width, depending on age, color, genetics, and other factors. An average hair is approximately 70 to 100 micrometers (µm) in diameter, so, as a rough standard, a hair's breadth is 100 µm or 0.1 millimeter (mm).