Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
metric [ˈmɛtrɪk] adj метри́ческий#
to go metric переходи́ть*(перейти́*perf) на метри́ческую систе́му мер
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.