Endicia is our rate partner for First Class Mail International (FCMI) shipments. The rate for these shipments is calculated on a weight range basis, meaning that specific weights cost the same to ship.
Dependent upon the weight range that your package falls into, Endicia will automatically list the heaviest weight in that range on the label.
There are the weight ranges outlined by Endicia:
61-64oz (The heaviest package you can ship FCMI is 4lbs.)
To clarify, packages weighing 37, 38, 39, or 40oz will all ship at the same rate, but 40oz will be shown on the label as it's the heaviest weight in the range. Also, if you're shipping a 22oz package, Endicia will show 24oz on the label; and if you're shipping a 51oz, Endicia will show 52oz on the label.