1 Twip is exactly one twentieth (1/20) of a PostScript point. A PostScript point itself being 1/72 of an inch, making a twip 1/1440 inch. 1 Twip is approximately 1.763889 x 10-5 meters (SI base unit). 1 twp ≈ 0.000017638888888889 m.
1 Arpent (as a length) contains 180 feet (French measure) and 1 Foot (French measure) = 12.789 inches according to Canadian Weights and Measures Act (R.S.C., 1985, c. W-6). 1 Arpent = 180 ft (French measure) = 58.471308 meters.