In Egypt, the metric system was made optional in 1873 and has been compulsory in government use since 1891.
Units and their interrelations were very variable in the national system.
road-measure pic) = 0.7389 m. One itenery derah was equal to 0.7389 m.[3] Some other units according to the metric equivalences defined in 1891 are given below:[1][2] 1 cassaba = 5 derah 1 bââh = 2+1⁄2 derah 1 mili = 500 cassabas = 1.148 mile (1.847 km) 1 farsakh (league) = 3 mili 1 baride = 4 farsakh 1 safar yome (of which 2+1⁄2 make 1° of the meridian = 60 mili) = 2 baride.
One oke was equal to 1.248 kg, according to the metric equivalences defined in 1891.
Squares of derah and cassaba (3.55 m) was used to partly measure lands.