Description
The USPS Shipping addon connects WooCommerce checkout to the United States Postal Service API, calculating real-time shipping rates for services such as Priority Mail, First-Class Mail, Priority Mail Express, and Parcel Select. Designed for stores selling physical products shipped from the United States, it displays exact rates based on weight, dimensions, and destination ZIP code directly on the checkout page.
Key Features of USPS Shipping
- Real-time calculation via API
Queries the official USPS API and returns current rates during checkout. - Domestic services covered
Supports Priority Mail, First-Class Mail, Priority Mail Express, Parcel Select, and Media Mail. - International shipping
Enables options such as Priority Mail International, First-Class Package International, and Priority Mail Express International. - Calculation based on weight and dimensions
Uses the weight and dimensions configured for each product to return the correct postage rate. - Compatibility with Flat Rate Boxes
Allows products to be mapped to standardized USPS boxes and charges the corresponding flat rate.
Benefits of USPS Shipping
- Accurate shipping at checkout
Eliminates discrepancies between the amount charged to the customer and the actual postage cost. - Less cart abandonment
Displays the final shipping price before payment, reducing surprises that prevent purchases. - No manual shipping rate table
Eliminates the need to manually create and update regions and weight ranges. - Domestic and international coverage
Supports sales within the U.S. and exports through the same centralized configuration.
Who Is USPS Shipping For?
- Anyone selling physical products shipped from the United States through WooCommerce.
- You, if you use USPS as your primary carrier or as an alternative to UPS and FedEx.
- Anyone who needs to offer international shipping with rates calculated directly through the USPS API.
How to Download USPS Shipping
USPS Shipping is available for download here at Ultrapack. After downloading the .zip file, install it by going to Plugins > Add New > Upload Plugin, select the file, and activate it. Credentials and shipping services can be configured under WooCommerce > Settings > Shipping, in the dedicated USPS tab.
Designed for WooCommerce stores that handle logistics in the United States, USPS Shipping centralizes shipping rate calculations within the store dashboard and eliminates external rate spreadsheets. Direct integration with the API keeps rates aligned with the official U.S. postal service pricing at all times, ensuring consistency between what the customer sees and the actual postage cost when the order is shipped.
Frequently asked questions
Is WooCommerce USPS Shipping GPL-licensed?
Yes. WooCommerce USPS Shipping is distributed under the GPL (GNU General Public License). You may legally use, modify and redistribute it on as many sites as you want.
Can I use WooCommerce USPS Shipping on multiple sites?
Yes. You can install WooCommerce USPS Shipping on as many sites as you want. Only automatic updates through Ultrapack Auto Updater have a limit: from 3 to 80 sites, depending on the plan.
How much does WooCommerce USPS Shipping cost at Ultrapack?
WooCommerce USPS Shipping costs US$2.99 as a single purchase, and it is also included in the subscription plans starting at US$12/mo (VIP I).
Does WooCommerce USPS Shipping include updates?
Yes. The current version of WooCommerce USPS Shipping is 5.6.6, published at Ultrapack on Sep 24, 2026. Subscribers update straight from the WordPress dashboard with UAU (Ultrapack Auto Updater).
Is WooCommerce USPS Shipping scanned before publication?
Yes. Every version of WooCommerce USPS Shipping goes through a malware scan (ClamAV and YARA rules, at UltraHub) before it is published.
What are the requirements for the plugin WooCommerce USPS Shipping?
Requires WordPress 7.0 or higher and PHP 7.4 or higher. Tested up to WordPress 7.1.
What changed in this version
Version 5.6.6
- Fix - Resolved a fatal error on sites running Roots/Acorn or other software bundling PSR-3 Log 2.x or 3.x, caused by the bundled box packing library.
Version 5.6.5
- Tweak - WooCommerce 11.1 Compatibility.
Version 5.6.4
- Tweak - WordPress 7.1 Compatibility.
Version 5.6.3
- Fix - A Media Mail restriction pointing at a deleted shipping class silently blocked Media Mail while the settings screen showed no restriction. The deleted class now appears in the setting so it can be seen and removed.
- Tweak - Add readme.txt to fix a QIT validation warning.
Version 5.6.2 2026-08-10
- Fix - Boxes large enough for USPS dimensional pricing were quoted the cheaper nonrectangular parcel price, undercharging shipping. Rectangular pricing is now used.
- Fix - Sites using the wc_usps_rate_indicators filter should confirm their callback preserves the new nonrectangular group, since callbacks that return a fresh array will drop it.
- Tweak - Remove the product block editor integration, which WooCommerce 11.0 no longer supports.
Release notes published by the developer.
How to install
Automatic updates: this item is updated by the Ultrapack Auto Updater. With it installed, the new version shows up in your dashboard like any other WordPress update (how to set it up).
- Download the file
woocommerce-shipping-usps.zip. - In the WordPress dashboard, go to Plugins > Add New > Upload Plugin.
- Select the file
woocommerce-shipping-usps.zipand click Install Now. - Click Activate.
Requirements: Requires WordPress 7.0 or higher and PHP 7.4 or higher. Tested up to WordPress 7.1.
Stuck on a step? Open a ticket telling us which one you stopped at.

UAU Ready