USPS Priority Mail Cubic®

Learn everything you need to know about USPS's service that could save you up to 90% off your ecommerce shipments.

What is Cubic Pricing?

Simply put, Priority Mail Cubic® is USPS's fasted and cheapest way to ship your smaller ecommerce packages, specifically those that weigh between 1 - 20 pounds. These discounts are as much as 90% off the price you pay at the post office.

Packages that qualify for USPS Priority Mail Cubic® are typically delivered anywhere in the USA between 1 - 3 days and include door-to-door tracking so that you and your customer can keep an eye on their prized goods.

Does My Package Qualify?

Packages must meet the following criteria to qualify for Priority Mail Cubic®:

  • Weighs less than 20 lbs
  • Each side is less than 18 inches in length
  • Total package is less than 0.5 cubic feet

If any single side is larger than 18 inches, your package will not qualify. Even if more that one side is close to 18 inches, it's likely too large to qualify.

Calculate Cubic Feet

To calculate the total cubic feet, use this formula:

(Length x Width x Height)/1,728 = Cubic Feet

Once you have your cubic feet calculated, your package will fall into one of these 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

USPS Cubic Pricing By Zone for Packages Less than 20 Lbs

Cubic Ft
(up to)

.01

.02

.03

.04

.05

Zone 1 & 2

$6.95

$7.34

$7.79

$7.95

$8.07

Zone 3

$7.28

$7.68

$7.99

$8.27

$8.56

Zone 4

$7.49

$7.91

$8.27

$8.63

$9.13

Zone 5

$7.65

$8.12

$8.92

$9.50

$10.34

Zone 6

$7.82

$8.40

$10.18

$11.79

$13.95

Zone 7

$7.99

$8.61

$10.73

$12.94

$15.75

Zone 8

$8.25

$8.92

$11.39

$14.79

$17.91

Zone 9

$9.91

$10.92

$15.90

$20.09

$24.96

Find USPS Priority Mail Cubic® Pricing by Shipping Zone

Once you have found the total cubic feet of your package, finding your price using USPS Priority Mail Cubic® is easy. Just use the following chart (or visit USPS.com) to find the price for the corresponding shipping zones.

Remember, even if your package fits within the cubic feet requirements, it must be less than 20 lbs.

Does My Business Qualify?

That depends on how you purchase your USPS shipping label.

USPS Priority Mail Cubic® isn't available by walking into the post office, so you will need to use a USPS technology partner like SmartShyp in order to access these discounted rates.

You can create an account and get started for free today.

Use USPS Priority Mail Cubic with SmartShyp

Create a free SmartShyp account today and speak with a one of our Shipping Consultants about saving up to 90% off your shipping rates using USPS Priority Mail Cubic®. We'll help you make sure it's the best fit for your business and show you how to start saving money and time using the powerful tools inside of SmartShyp.

SCHEDULE A DEMO

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