You can compare postage rates for various classes and services when printing postage on tapes or envelopes using the Envelope Printing application.
Tap Class on the Envelope Printing screen. You can then select and compare the costs of different classes and services. The total cost for each class and services combination is displayed at the bottom right of the screen as shown here. Rates that are not applicable to the weight of the letter will not be displayed.
UPDATED: November 04, 2020