How to Calculate Postage for Large Envelopes
USPS charges large envelopes — which it also calls flats — on a simple formula: find the piece’s weight in […]
USPS Mailing Rules
USPS size, weight, addressing, and postage rules explained in plain language, based on official sources.
Do Greeting Cards Need Extra Postage?
Usually, no. A standard rectangular greeting card in its envelope, weighing 1 ounce or less, mails with a single Forever […]
How to Address an Envelope in the USA
An envelope has three blocks of information, and USPS sorting equipment reads them in fixed places: your return address in […]
USPS Letter Size and Weight Requirements
USPS prices letters by shape first and weight second. If your envelope fits the letter-size window, it travels at letter […]