The Orlanthi don't use the metric system: they count in cows, bushels and hides.
Wealth is measured by the number of cows a person or clan possesses. Cows are so important to them that every type of good is measured by how much it is worth in cows.
Food is measured in bushels. One bushel is about enough to feed one person for one full year.
The term bushel is short for "Ernalda's Bushel".
A unit of land is called a hide. One hide is approximately enough to support a family.