The best replacement for metric system is english system.

The best alternatives to metric system are rated as following:
★★★★★  english system
★★  standard
★★  imperial
★★  si
★★  american system
★★  imperial system
★★  standard system
★★  us system
★★  english
★  customary
  customary system
  si system
  us customary
  standard measurement
  us system of measurements
  english system of measurement
  us customary system
  si units
  measurements
  customary units
  us measurement
  yards

Your alternative for metric system is not listed? Suggest!
Speaking about metric system, one probably shouldn't forget about conversions.

Other search terms related to metric system and their ratings are:
★★★★★ conversions
★ english system
teaspoons
You have in mind a companion for metric system and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of metric system in all years. Click on graph for more.
metric system
english system
standard