1 mil is exactly 1 x 10-3 inches. In SI units 1 mil is 2.54 x 10-5 meters.
Shaku was standardized to exactly 10/33 meters (SI base unit). Originally based on the length of the forearm this unit may also be referred to as a Japanese foot. 1 Shaku ≈ 11.93 in ≈ 0.9942 ft ≈ 0.30303 m.