There are 2 ways how it is interpreted. The diameter of the pot or the volume of the pot.
FYI,
https://www.specialitytrees.com.au/coll ... g-pot-size
Thanks vintay
We have asked for 140mm and listed plant numbers. These ppl gave us zero guidance. They briefly had a h0triculturist come help with paving.... but that was useless. They never told us they wanted pot sizes until today just to make life difficult.