Explaining different shipping and package sizes

Learn about different USPS shipping and package sizes, and access free online tools including Postage Calculator.

For current USPS® information, refer to Mailing Standards - Domestic Mail Manual.

Rate Chart Print a Rate Chart - USPS Summary of Rates & Pricing - January 2019

  • Domestic Quick Reference Guide and Flat Rates for Domestic
  • Quick Reference for International Prices and International Flats.

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


UPDATED: January 10, 2019