The amount of postage required for a mail piece is based on USPS regulations and includes the following factors:
There are three ways to calculate and apply postage to your mail piece.
This procedure can be used when you already know the weight of a mail piece and you are not using the weighing platform. Refer to Applying Postage Entering Weight Manually.
The machine can calculate the postage required for the mail piece. Refer to Applying Postage Using The Scale.
Differential weighing is an optional feature that allows you to place multiple items on the weighing platform, remove one item at a time, rate that item, and put postage on it. This is repeated until you have finished all of the items on the weighing platform. This procedure is usually done when you have multiple mail pieces with different weights but all using the same class for rating. Refer to Apply Postage Using Differential Weighing Mode.
Large Pieces and Parcels ‑ It is recommended that you use the Shipping Label button to print carrier shipping labels for large pieces and parcels. Shipping discounts may be available by printing a full address shipping label through the Shipping application.
ZIP Codes and Zone Numbers ‑ The system allows you to enter either a ZIP code or a Zone number for those USPS classes and services that require a destination entry (e.g., Priority class over 1 lb). When prompted to enter a destination in these cases, you may either enter the one-digit Zone number (0-8) and select This is a Zone or enter the 5-digit ZIP code and select This is a ZIP Code.
Note:
You can calculate the postage amount for a mail piece without metering it. Refer to Get A Postage Rate Preview.