USPS Cubic Rates

USPS Cubic Pricing provides high volume shipping customers discounted rates for small, heavy packages. Priority Mail packages weighing less than 20 pounds and measuring no more than 0.5 cubic feet in volume are eligible for Cubic Pricing as long as you meet the minimum package requirements. For these packages, customers will pay shipping costs for the actual size of the package and the shipping distance instead of its weight.

Compared to other shipping carriers such as FedEx and UPS that only offer pricing based on weight and distance, USPS Cubic Pricing is a great alternative to help lower shipping costs. In order to qualify for Cubic Pricing, customers must ship over 50,000 packages a year.

How does Cubic Pricing work?

The cubic pricing for your USPS package is measured by calculating:
Length x Width x Height / 1728 = Cubic Feet
Note: All measurements should be rounded down to the nearest 0.25 inch.

Once you have the cubic feet measurement, your package will fall into one of five tiers:

  • Tier 1: Packages up to .10 cubic feet
  • Tier 2: Packages more than .10 and up to .20 cubic feet
  • Tier 3: Packages more than .20 and up to .30 cubic feet
  • Tier 4: Packages more than .30 and up to .40 cubic feet
  • Tier 5: Packages more than .40 and up to .50 cubic feet

To use this feature package dimensions should be included on the shipping label requests. In ShipBridge go to Menu > Options > Shipping and enable Populate package dimensions in shipping labels requests



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