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).
Unit Definition (toise) A linear measure used by the French in the old regime. A toise is equal to 76.71 English inches, 6.39 English feet or 1.9490 meters.
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Length/Distance 
Convert from hair's breadth to toise
