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Explaining different shipping and package sizes
UPDATED: January 10, 2018
For current USPS® information, refer to Mailing Standards - Domestic Mail Manual.
The USPS site contains the current physical standards and sizes for letters, parcels, and flats.
USPS Postage Price Calculator is a free online tool that allows you:
- Calculate Postcard price
- View Flat Rate Envelopes
- View Flat Rate Boxes
- Calculate price based on Shape and Size
Another helpful resource: Guide to Shipping - interactive guide with the latest prices, news and updates, and ways to save.